fix: certificate button only on paid Purchase Invoices

The certificate is issued when the tax is withheld, i.e. on payment; show the button once the submitted invoice's status is Paid.
feat: Withholding Tax Certificate button on Purchase Invoice
2026-09-22 03:58:04 +00:00 · 2026-09-22 03:29:54 +00:00 · 2026-09-22 03:29:54 +00:00 · 2026-09-22 03:29:39 +00:00 · 2026-09-18 03:52:35 +00:00 · 2026-09-17 10:30:43 +00:00
19 changed files with 794 additions and 55 deletions
@@ -20,6 +20,17 @@ file overrides the upstream Thai for the standard labels the print formats show.
 print formats embed Sarabun (`public/fonts`, OFL) so PDFs render Thai on servers
 without a Thai system font. Switch a user or the print language to `th` to use it.

+### Withholding tax certificate
+
+A paid Purchase Invoice with *Apply Tax Withholding Amount* gets a **Withholding Tax Certificate**
+button that downloads the Revenue Department's Sec. 50 bis form (หนังสือรับรองการหักภาษี ณ ที่จ่าย,
+two copies) as a PDF: the *Withholding Tax Certificate* print format lays the invoice's data
+over the official form (`public/images`). The row the payment is reported on comes from
+*Type of Income Paid* on the Tax Withholding Category (set for the shipped categories; pick it
+for your own), and the ภ.ง.ด. return is ticked from the Supplier's type: ภ.ง.ด.53 for juristic
+payees, ภ.ง.ด.1ก / 2 / 3 by income type for individuals. เล่มที่ / เลขที่ (certificate book
+numbers) and ลำดับที่ (the line in the return) are left for the accountant.
+
 ### Contributing

 This app uses `pre-commit` for code formatting and linting. Please [install pre-commit](https://pre-commit.com/#installation) and enable it for this repository:
@@ -0,0 +1,73 @@
+{
+ "custom_fields": [
+  {
+   "_assign": null,
+   "_comments": null,
+   "_liked_by": null,
+   "_user_tags": null,
+   "allow_in_quick_entry": 0,
+   "allow_on_submit": 0,
+   "bold": 0,
+   "collapsible": 0,
+   "collapsible_depends_on": null,
+   "columns": 0,
+   "creation": "2026-09-22 09:00:00.000000",
+   "default": null,
+   "depends_on": null,
+   "description": "Row of the withholding tax certificate (50 Tawi) the payment is reported on; Other prints the category name in row 6.",
+   "docstatus": 0,
+   "dt": "Tax Withholding Category",
+   "fetch_from": null,
+   "fetch_if_empty": 0,
+   "fieldname": "income_type",
+   "fieldtype": "Select",
+   "hidden": 0,
+   "hide_border": 0,
+   "hide_days": 0,
+   "hide_seconds": 0,
+   "idx": 2,
+   "ignore_user_permissions": 0,
+   "ignore_xss_filter": 0,
+   "in_global_search": 0,
+   "in_list_view": 0,
+   "in_preview": 0,
+   "in_standard_filter": 0,
+   "insert_after": "category_name",
+   "is_system_generated": 0,
+   "is_virtual": 0,
+   "label": "Type of Income Paid",
+   "length": 0,
+   "link_filters": null,
+   "mandatory_depends_on": null,
+   "modified": "2026-09-22 09:00:00.000000",
+   "modified_by": "Administrator",
+   "module": null,
+   "name": "Tax Withholding Category-income_type",
+   "no_copy": 0,
+   "non_negative": 0,
+   "options": "\nSalary and Wages - Sec. 40(1)\nFees and Commissions - Sec. 40(2)\nRoyalties - Sec. 40(3)\nInterest - Sec. 40(4)(a)\nDividends - Sec. 40(4)(b)\nSec. 3 Tera (Services, Rent, Contract Work etc.)\nOther",
+   "owner": "Administrator",
+   "permlevel": 0,
+   "placeholder": null,
+   "precision": null,
+   "print_hide": 0,
+   "print_hide_if_no_value": 0,
+   "print_width": null,
+   "read_only": 0,
+   "read_only_depends_on": null,
+   "report_hide": 0,
+   "reqd": 0,
+   "search_index": 0,
+   "show_dashboard": 0,
+   "sort_options": 0,
+   "translatable": 0,
+   "unique": 0,
+   "width": null
+  }
+ ],
+ "custom_perms": [],
+ "doctype": "Tax Withholding Category",
+ "links": [],
+ "property_setters": [],
+ "sync_on_migrate": 1
+}
@@ -5,7 +5,8 @@
  "consider_party_ledger_amount": 0,
  "docstatus": 0,
  "doctype": "Tax Withholding Category",
-  "modified": "2026-09-11 09:00:00.000000",
+  "income_type": "Fees and Commissions - Sec. 40(2)",
+  "modified": "2026-09-22 12:00:00.000000",
  "name": "WHT 3% - Commission",
  "rates": [
   {
@@ -31,7 +32,8 @@
  "consider_party_ledger_amount": 0,
  "docstatus": 0,
  "doctype": "Tax Withholding Category",
-  "modified": "2026-09-11 09:00:00.000000",
+  "income_type": "Royalties - Sec. 40(3)",
+  "modified": "2026-09-22 12:00:00.000000",
  "name": "WHT 3% - Royalty",
  "rates": [
   {
@@ -57,7 +59,8 @@
  "consider_party_ledger_amount": 0,
  "docstatus": 0,
  "doctype": "Tax Withholding Category",
-  "modified": "2026-09-11 09:00:00.000000",
+  "income_type": "Interest - Sec. 40(4)(a)",
+  "modified": "2026-09-22 12:00:00.000000",
  "name": "WHT 1% - Interest (Company)",
  "rates": [
   {
@@ -83,7 +86,8 @@
  "consider_party_ledger_amount": 0,
  "docstatus": 0,
  "doctype": "Tax Withholding Category",
-  "modified": "2026-09-11 09:00:00.000000",
+  "income_type": "Interest - Sec. 40(4)(a)",
+  "modified": "2026-09-22 12:00:00.000000",
  "name": "WHT 15% - Interest (Individual)",
  "rates": [
   {
@@ -109,7 +113,8 @@
  "consider_party_ledger_amount": 0,
  "docstatus": 0,
  "doctype": "Tax Withholding Category",
-  "modified": "2026-09-11 09:00:00.000000",
+  "income_type": "Dividends - Sec. 40(4)(b)",
+  "modified": "2026-09-22 12:00:00.000000",
  "name": "WHT 10% - Dividend",
  "rates": [
   {
@@ -135,7 +140,8 @@
  "consider_party_ledger_amount": 0,
  "docstatus": 0,
  "doctype": "Tax Withholding Category",
-  "modified": "2026-09-11 09:00:00.000000",
+  "income_type": "Sec. 3 Tera (Services, Rent, Contract Work etc.)",
+  "modified": "2026-09-22 12:00:00.000000",
  "name": "WHT 5% - Rent",
  "rates": [
   {
@@ -161,7 +167,8 @@
  "consider_party_ledger_amount": 0,
  "docstatus": 0,
  "doctype": "Tax Withholding Category",
-  "modified": "2026-09-11 09:00:00.000000",
+  "income_type": "Sec. 3 Tera (Services, Rent, Contract Work etc.)",
+  "modified": "2026-09-22 12:00:00.000000",
  "name": "WHT 1% - Ship Rental",
  "rates": [
   {
@@ -187,7 +194,8 @@
  "consider_party_ledger_amount": 0,
  "docstatus": 0,
  "doctype": "Tax Withholding Category",
-  "modified": "2026-09-11 09:00:00.000000",
+  "income_type": "Sec. 3 Tera (Services, Rent, Contract Work etc.)",
+  "modified": "2026-09-22 12:00:00.000000",
  "name": "WHT 3% - Professional Fee",
  "rates": [
   {
@@ -213,7 +221,8 @@
  "consider_party_ledger_amount": 0,
  "docstatus": 0,
  "doctype": "Tax Withholding Category",
-  "modified": "2026-09-11 09:00:00.000000",
+  "income_type": "Sec. 3 Tera (Services, Rent, Contract Work etc.)",
+  "modified": "2026-09-22 12:00:00.000000",
  "name": "WHT 3% - Contract Work",
  "rates": [
   {
@@ -239,7 +248,8 @@
  "consider_party_ledger_amount": 0,
  "docstatus": 0,
  "doctype": "Tax Withholding Category",
-  "modified": "2026-09-11 09:00:00.000000",
+  "income_type": "Sec. 3 Tera (Services, Rent, Contract Work etc.)",
+  "modified": "2026-09-22 12:00:00.000000",
  "name": "WHT 3% - Service",
  "rates": [
   {
@@ -265,7 +275,8 @@
  "consider_party_ledger_amount": 0,
  "docstatus": 0,
  "doctype": "Tax Withholding Category",
-  "modified": "2026-09-11 09:00:00.000000",
+  "income_type": "Sec. 3 Tera (Services, Rent, Contract Work etc.)",
+  "modified": "2026-09-22 12:00:00.000000",
  "name": "WHT 3% - Sales Promotion",
  "rates": [
   {
@@ -291,7 +302,8 @@
  "consider_party_ledger_amount": 0,
  "docstatus": 0,
  "doctype": "Tax Withholding Category",
-  "modified": "2026-09-11 09:00:00.000000",
+  "income_type": "Sec. 3 Tera (Services, Rent, Contract Work etc.)",
+  "modified": "2026-09-22 12:00:00.000000",
  "name": "WHT 2% - Advertising",
  "rates": [
   {
@@ -317,7 +329,8 @@
  "consider_party_ledger_amount": 0,
  "docstatus": 0,
  "doctype": "Tax Withholding Category",
-  "modified": "2026-09-11 09:00:00.000000",
+  "income_type": "Sec. 3 Tera (Services, Rent, Contract Work etc.)",
+  "modified": "2026-09-22 12:00:00.000000",
  "name": "WHT 1% - Transportation",
  "rates": [
   {
@@ -343,7 +356,8 @@
  "consider_party_ledger_amount": 0,
  "docstatus": 0,
  "doctype": "Tax Withholding Category",
-  "modified": "2026-09-11 09:00:00.000000",
+  "income_type": "Sec. 3 Tera (Services, Rent, Contract Work etc.)",
+  "modified": "2026-09-22 12:00:00.000000",
  "name": "WHT 1% - Non-Life Insurance",
  "rates": [
   {
@@ -369,7 +383,8 @@
  "consider_party_ledger_amount": 0,
  "docstatus": 0,
  "doctype": "Tax Withholding Category",
-  "modified": "2026-09-11 09:00:00.000000",
+  "income_type": "Sec. 3 Tera (Services, Rent, Contract Work etc.)",
+  "modified": "2026-09-22 12:00:00.000000",
  "name": "WHT 5% - Prize",
  "rates": [
   {
@@ -395,7 +410,8 @@
  "consider_party_ledger_amount": 0,
  "docstatus": 0,
  "doctype": "Tax Withholding Category",
-  "modified": "2026-09-11 09:00:00.000000",
+  "income_type": "Sec. 3 Tera (Services, Rent, Contract Work etc.)",
+  "modified": "2026-09-22 12:00:00.000000",
  "name": "WHT 5% - Public Entertainer",
  "rates": [
   {
@@ -421,7 +437,8 @@
  "consider_party_ledger_amount": 0,
  "docstatus": 0,
  "doctype": "Tax Withholding Category",
-  "modified": "2026-09-11 09:00:00.000000",
+  "income_type": "Sec. 3 Tera (Services, Rent, Contract Work etc.)",
+  "modified": "2026-09-22 12:00:00.000000",
  "name": "WHT 0.75% - Agricultural Produce",
  "rates": [
   {
@@ -447,7 +464,8 @@
  "consider_party_ledger_amount": 0,
  "docstatus": 0,
  "doctype": "Tax Withholding Category",
-  "modified": "2026-09-11 09:00:00.000000",
+  "income_type": "Sec. 3 Tera (Services, Rent, Contract Work etc.)",
+  "modified": "2026-09-22 12:00:00.000000",
  "name": "WHT 1% - Aquatic Animals",
  "rates": [
   {
@@ -473,7 +491,8 @@
  "consider_party_ledger_amount": 0,
  "docstatus": 0,
  "doctype": "Tax Withholding Category",
-  "modified": "2026-09-11 09:00:00.000000",
+  "income_type": "Other",
+  "modified": "2026-09-22 12:00:00.000000",
  "name": "WHT 1% - Immovable Property (Company)",
  "rates": [
   {
@@ -499,7 +518,8 @@
  "consider_party_ledger_amount": 0,
  "docstatus": 0,
  "doctype": "Tax Withholding Category",
-  "modified": "2026-09-11 09:00:00.000000",
+  "income_type": "Other",
+  "modified": "2026-09-22 12:00:00.000000",
  "name": "WHT 15% - Non-Resident Individual",
  "rates": [
   {
@@ -525,7 +545,8 @@
  "consider_party_ledger_amount": 0,
  "docstatus": 0,
  "doctype": "Tax Withholding Category",
-  "modified": "2026-09-11 09:00:00.000000",
+  "income_type": "Other",
+  "modified": "2026-09-22 12:00:00.000000",
  "name": "WHT 15% - Foreign Company",
  "rates": [
   {
@@ -551,7 +572,8 @@
  "consider_party_ledger_amount": 0,
  "docstatus": 0,
  "doctype": "Tax Withholding Category",
-  "modified": "2026-09-11 09:00:00.000000",
+  "income_type": "Other",
+  "modified": "2026-09-22 12:00:00.000000",
  "name": "WHT 10% - Foreign Company Dividend",
  "rates": [
   {
@@ -43,7 +43,10 @@ required_apps = ["erpnext"]
 # page_js = {"page" : "public/js/file.js"}

 # include js in doctype views
-doctype_js = {"Payment Entry": "public/js/payment_entry.js"}
+doctype_js = {
+	"Payment Entry": "public/js/payment_entry.js",
+	"Purchase Invoice": "public/js/purchase_invoice.js",
+}
 # doctype_list_js = {"doctype" : "public/js/doctype_list.js"}
 # doctype_tree_js = {"doctype" : "public/js/doctype_tree.js"}
 # doctype_calendar_js = {"doctype" : "public/js/doctype_calendar.js"}
@@ -79,6 +82,7 @@ jinja = {
 		"default_thai_company.utils.get_letter_head_company",
 		"default_thai_company.utils.get_company_bank_account",
 		"default_thai_company.utils.get_in_words",
+		"default_thai_company.tax_withholding.get_withholding_certificate",
 	],
 }

@@ -100,6 +104,7 @@ fixtures = [
 					"Default Standard Sales Invoice",
 					"Default Standard Tax Invoice/Receipt",
 					"Default Standard Quotation",
+					"Withholding Tax Certificate",
 				],
 			]
 		],
@@ -138,9 +143,17 @@ fixtures = [
 # Installation
 # ------------

-# before_install = "default_thai_company.install.before_install"
-# Fixtures are synced before this runs; VAT schemes for companies that already exist.
-after_install = "default_thai_company.vat.setup_companies"
+# Fixtures are synced before Custom Fields on install and migrate; the Tax Withholding
+# Category fixtures carry values for the app's Custom Fields, so create those first.
+before_install = "default_thai_company.tax_withholding.sync_category_customizations"
+before_migrate = "default_thai_company.tax_withholding.sync_category_customizations"
+# Fixtures are synced before this runs; VAT schemes and Shipping Rules for companies
+# that already exist.
+after_install = [
+	"default_thai_company.vat.setup_companies",
+	"default_thai_company.shipping.setup_companies",
+	"default_thai_company.payroll.setup_companies",
+]
 # Fixture import re-inserts the Location tree; restore lft/rgt for user-added nodes.
 after_migrate = "default_thai_company.assets.rebuild_locations"

@@ -156,7 +169,8 @@ after_migrate = "default_thai_company.assets.rebuild_locations"
 # Name of the app being installed is passed as an argument

 # before_app_install = "default_thai_company.utils.before_app_install"
-# after_app_install = "default_thai_company.utils.after_app_install"
+# Payroll Period for companies created before hrms was installed.
+after_app_install = "default_thai_company.payroll.after_app_install"

 # Integration Cleanup
 # -------------------
@@ -191,6 +205,7 @@ after_migrate = "default_thai_company.assets.rebuild_locations"
 override_doctype_class = {
 	"Sales Invoice": "default_thai_company.tax_withholding.ThaiSalesInvoice",
 	"Payment Entry": "default_thai_company.tax_withholding.ThaiPaymentEntry",
+	"Shipping Rule": "default_thai_company.shipping.ThaiShippingRule",
 }

 # Document Events
@@ -213,6 +228,8 @@ doc_events = {
 			"default_thai_company.tax_withholding.setup_company",
 			"default_thai_company.vat.setup_company",
 			"default_thai_company.assets.setup_company",
+			"default_thai_company.shipping.setup_company",
+			"default_thai_company.payroll.setup_company",
 		],
 	},
 	"Payment Entry": {
@@ -223,23 +240,10 @@ doc_events = {
 # Scheduled Tasks
 # ---------------

-# scheduler_events = {
-# 	"all": [
-# 		"default_thai_company.tasks.all"
-# 	],
-# 	"daily": [
-# 		"default_thai_company.tasks.daily"
-# 	],
-# 	"hourly": [
-# 		"default_thai_company.tasks.hourly"
-# 	],
-# 	"weekly": [
-# 		"default_thai_company.tasks.weekly"
-# 	],
-# 	"monthly": [
-# 		"default_thai_company.tasks.monthly"
-# 	],
-# }
+# Payroll Period is per calendar year; roll the default over on 1 January.
+scheduler_events = {
+	"daily": ["default_thai_company.payroll.setup_companies"],
+}

 # Testing
 # -------
@@ -6,3 +6,5 @@
 # Patches added in this section will be executed after doctypes are migrated
 default_thai_company.patches.create_vat_accounts
 default_thai_company.patches.create_vat_templates
+default_thai_company.patches.create_shipping_rules
+default_thai_company.patches.create_payroll_periods
@@ -0,0 +1,5 @@
+from default_thai_company.payroll import setup_companies
+
+
+def execute():
+	setup_companies()
@@ -0,0 +1,5 @@
+from default_thai_company.shipping import setup_companies
+
+
+def execute():
+	setup_companies()
@@ -0,0 +1,62 @@
+import frappe
+from frappe.utils import getdate
+
+from default_thai_company.tax_withholding import thai_companies
+
+# Thai personal income tax (P.N.D.1/91) is assessed per calendar year whatever
+# the company's fiscal year, so the Payroll Period is January to December.
+# Payroll Period is named by prompt (site-wide unique) but bound to one company,
+# so each Thai company gets "<year> - <abbr>", like the Shipping Rule.
+
+
+def hrms_installed():
+	return "hrms" in frappe.get_installed_apps()
+
+
+def payroll_period_name(company, year):
+	abbr = frappe.get_cached_value("Company", company, "abbr")
+	return f"{year} - {abbr}"
+
+
+def ensure_payroll_period(company, year):
+	"""Calendar-year Payroll Period for `company`. No-op when any period of the
+	company touches the year: an existing one covers it, or the company runs its
+	own scheme and a second period would only fail the overlap check."""
+	start, end = f"{year}-01-01", f"{year}-12-31"
+	if frappe.db.exists(
+		"Payroll Period", {"company": company, "start_date": ("<=", end), "end_date": (">=", start)}
+	):
+		return
+	frappe.get_doc(
+		{
+			"doctype": "Payroll Period",
+			"name": payroll_period_name(company, year),
+			"company": company,
+			"start_date": start,
+			"end_date": end,
+		}
+	).insert(ignore_permissions=True)
+
+
+def setup_company(doc, method=None):
+	"""Company.on_update: this year's Payroll Period for a Thai company."""
+	if doc.country == "Thailand" and hrms_installed():
+		ensure_payroll_period(doc.name, getdate().year)
+
+
+def setup_companies():
+	"""after_install, the daily scheduler, and the create_payroll_periods patch:
+	this year's Payroll Period for every Thai company. The scheduler rolls the
+	default over on 1 January."""
+	if not hrms_installed():
+		return
+	year = getdate().year
+	for company in thai_companies():
+		ensure_payroll_period(company, year)
+
+
+def after_app_install(app_name):
+	"""Payroll Period only exists once hrms is installed; catch companies that
+	were created before it."""
+	if app_name == "hrms":
+		setup_companies()
@@ -0,0 +1,23 @@
+frappe.ui.form.on("Purchase Invoice", {
+	refresh(frm) {
+		// The certificate is issued once the tax has been withheld, i.e. on payment.
+		if (!frm.doc.apply_tds || frm.doc.docstatus !== 1 || frm.doc.status !== "Paid") return;
+		// The Withholding Tax Certificate print format renders the Revenue Department's
+		// Sec. 50 bis form (fixtures/print_format.json) as a PDF.
+		frm.add_custom_button(__("Withholding Tax Certificate"), () => {
+			const params = new URLSearchParams({
+				doctype: frm.doctype,
+				name: frm.docname,
+				format: "Withholding Tax Certificate",
+				no_letterhead: 1,
+				_lang: "th",
+			});
+			const w = window.open(
+				frappe.urllib.get_full_url(
+					`/api/method/frappe.utils.print_format.download_pdf?${params}`
+				)
+			);
+			if (!w) frappe.msgprint(__("Please enable pop-ups"));
+		});
+	},
+});
@@ -0,0 +1,66 @@
+import erpnext
+import frappe
+from erpnext.accounts.doctype.shipping_rule.shipping_rule import ShippingRule
+
+from default_thai_company.tax_withholding import company_ready, get_or_create_account, thai_companies
+
+# Shipping Rule is named by its label (site-wide unique) but bound to one company,
+# so each Thai company gets "<LABEL> - <abbr>", the way ERPNext names accounts and
+# tax templates. The label doubles as the charge description on the transaction.
+LABEL = "Shipping Charges"
+
+# Shipping billed to customers is revenue; the courier's bill stays an expense.
+SHIPPING_ACCOUNT = "Shipping Charges"
+SHIPPING_ACCOUNT_GROUPS = ("Direct Income", "Income")
+
+
+class ThaiShippingRule(ShippingRule):
+	def add_shipping_rule_to_tax_table(self, doc, shipping_amount):
+		"""A Fixed rule without an amount only seeds the charge row; the amount is
+		entered on the transaction. ERPNext re-applies the rule on every
+		recalculation, which would otherwise reset the row to 0."""
+		manual = self.calculate_based_on == "Fixed" and not self.shipping_amount
+		entered = [(row, row.tax_amount) for row in doc.get("taxes")] if manual else ()
+		super().add_shipping_rule_to_tax_table(doc, shipping_amount)
+		for row, amount in entered:
+			row.tax_amount = amount
+
+
+def shipping_rule_name(company):
+	abbr = frappe.get_cached_value("Company", company, "abbr")
+	return f"{LABEL} - {abbr}"
+
+
+def ensure_shipping_rule(company):
+	"""Selling Shipping Rule for `company` with the amount entered per
+	transaction (see ThaiShippingRule). No-op when the rule exists."""
+	name = shipping_rule_name(company)
+	if frappe.db.exists("Shipping Rule", name):
+		return
+	frappe.get_doc(
+		{
+			"doctype": "Shipping Rule",
+			"label": name,
+			"company": company,
+			"shipping_rule_type": "Selling",
+			"calculate_based_on": "Fixed",
+			"shipping_amount": 0,
+			"account": get_or_create_account(
+				company, SHIPPING_ACCOUNT, "Income", "Income Account", SHIPPING_ACCOUNT_GROUPS
+			),
+			"cost_center": erpnext.get_default_cost_center(company),
+		}
+	).insert(ignore_permissions=True)
+
+
+def setup_company(doc, method=None):
+	"""Company.on_update: default Shipping Rule for a Thai company."""
+	if company_ready(doc):
+		ensure_shipping_rule(doc.name)
+
+
+def setup_companies():
+	"""after_install and the create_shipping_rules patch: companies that exist
+	before this code did never pass through `setup_company`."""
+	for company in thai_companies():
+		ensure_shipping_rule(company)
@@ -1,3 +1,6 @@
+import json
+import os
+
 import erpnext
 import frappe
 from erpnext.accounts.doctype.payment_entry.payment_entry import PaymentEntry
@@ -8,7 +11,9 @@ from erpnext.accounts.doctype.tax_withholding_category.tax_withholding_category
 	normal_round,
 )
 from frappe import _
-from frappe.utils import cint, flt
+from frappe.contacts.doctype.address.address import get_default_address
+from frappe.modules.utils import sync_customizations_for_doctype
+from frappe.utils import cint, flt, fmt_money, getdate

 from default_thai_company.utils import money_in_words

@@ -122,6 +127,17 @@ def prepare_fixture_accounts(doc, method=None):
 			link_company(doc, company, ensure_company_accounts(company))


+def sync_category_customizations():
+	"""before_install / before_migrate: create the Tax Withholding Category Custom
+	Fields (custom/tax_withholding_category.json) ahead of the fixture import.
+	Frappe syncs fixtures before customizations, and a fixture value for a field
+	that does not exist yet is dropped."""
+	folder = frappe.get_app_path("default_thai_company", "default_thai_company", "custom")
+	filename = "tax_withholding_category.json"
+	with open(os.path.join(folder, filename)) as f:
+		sync_customizations_for_doctype(json.load(f), folder, filename)
+
+
 def company_ready(doc):
 	"""A Thai company whose chart of accounts exists."""
 	return doc.country == "Thailand" and frappe.db.exists("Account", {"company": doc.name})
@@ -374,3 +390,128 @@ def get_customer_withholding(doc):
 	else:
 		description = _("Withholding tax deducted by customer")
 	return flt(total, precision), description
+
+
+# Withholding tax certificate (หนังสือรับรองการหักภาษี ณ ที่จ่าย, Sec. 50 bis): the income
+# row the payment is reported on, from Tax Withholding Category.income_type (custom field).
+# Rows: 1 = Sec. 40(1), 2 = 40(2), 3 = 40(3), 4a = 40(4)(a), 4b = 40(4)(b) dividends
+# paid from profits taxed at the standard 20% rate (form row 4(b)(1)(1.3)), 5 = payments
+# withheld under Revenue Department orders issued under Sec. 3 tera, 6 = other (specified).
+CERTIFICATE_ROWS = {
+	"Salary and Wages - Sec. 40(1)": "1",
+	"Fees and Commissions - Sec. 40(2)": "2",
+	"Royalties - Sec. 40(3)": "3",
+	"Interest - Sec. 40(4)(a)": "4a",
+	"Dividends - Sec. 40(4)(b)": "4b",
+	"Sec. 3 Tera (Services, Rent, Contract Work etc.)": "5",
+}
+
+THAI_MONTHS = (
+	"มกราคม",
+	"กุมภาพันธ์",
+	"มีนาคม",
+	"เมษายน",
+	"พฤษภาคม",
+	"มิถุนายน",
+	"กรกฎาคม",
+	"สิงหาคม",
+	"กันยายน",
+	"ตุลาคม",
+	"พฤศจิกายน",
+	"ธันวาคม",
+)
+
+
+def pnd_form(row, supplier_type):
+	"""P.N.D. return the certificate row is filed on, as numbered on the form:
+	1 = ภ.ง.ด.1ก, 2 = ภ.ง.ด.2, 3 = ภ.ง.ด.3, 53 = ภ.ง.ด.53.
+
+	Juristic payees (Company; Partnership, taken as registered) file on
+	ภ.ง.ด.53 whatever the income; individuals by income type: salary on
+	ภ.ง.ด.1ก, Sec. 40(3)/(4) on ภ.ง.ด.2, the rest on ภ.ง.ด.3.
+	"""
+	if supplier_type != "Individual":
+		return "53"
+	if row == "1":
+		return "1"
+	if row in ("3", "4a", "4b"):
+		return "2"
+	return "3"
+
+
+def one_line_address(address_name):
+	"""Address in the order of the Thailand Address Template, on one line."""
+	if not address_name:
+		return None
+	address = frappe.get_cached_doc("Address", address_name)
+	parts = [
+		address.address_line1,
+		address.address_line2,
+		address.county,
+		address.city,
+		address.state,
+		address.pincode,
+	]
+	if address.country and address.country != "Thailand":
+		parts.append(address.country)
+	return " ".join(part.strip() for part in parts if part and part.strip())
+
+
+def tax_id_digits(tax_id):
+	"""The 13 digits of a Thai tax ID for the form's boxes, or None when it is not one."""
+	digits = "".join(ch for ch in (tax_id or "") if ch.isdigit())
+	return digits if len(digits) == 13 else None
+
+
+def get_withholding_certificate(doc):
+	"""Certificate data for a Purchase Invoice with Apply Tax Withholding Amount.
+
+	Amounts are in company currency; the form is Thai, so dates are Buddhist Era
+	and the tax in words is Thai whatever the print language.
+	"""
+	company = frappe.get_cached_doc("Company", doc.company)
+	currency = erpnext.get_company_currency(doc.company)
+	precision = doc.precision("base_grand_total")
+
+	category = (
+		frappe.get_cached_doc("Tax Withholding Category", doc.tax_withholding_category)
+		if doc.tax_withholding_category
+		else None
+	)
+	row = CERTIFICATE_ROWS.get(category.income_type if category else None, "6")
+	supplier_type = frappe.get_cached_value("Supplier", doc.supplier, "supplier_type")
+
+	amount = flt(doc.base_tax_withholding_net_total, precision)
+	tax = flt(
+		sum(abs(flt(t.base_tax_amount)) for t in doc.get("taxes") if cint(t.is_tax_withholding_account)),
+		precision,
+	)
+	posting_date = getdate(doc.posting_date)
+
+	return frappe._dict(
+		payer=frappe._dict(
+			name=company.company_name,
+			tax_id=company.tax_id,
+			tax_id_digits=tax_id_digits(company.tax_id),
+			address=one_line_address(get_default_address("Company", doc.company)),
+		),
+		payee=frappe._dict(
+			name=doc.supplier_name,
+			tax_id=doc.tax_id,
+			tax_id_digits=tax_id_digits(doc.tax_id),
+			address=one_line_address(doc.supplier_address or get_default_address("Supplier", doc.supplier)),
+		),
+		row=row,
+		# row 6 prints what was paid for; translations/th.csv carries the fixture categories
+		row_note=_(category.category_name) if row == "6" and category else None,
+		pnd=pnd_form(row, supplier_type),
+		date=f"{posting_date.day:02d}/{posting_date.month:02d}/{posting_date.year + 543}",
+		amount=fmt_money(amount, precision),
+		tax=fmt_money(tax, precision),
+		tax_in_words=money_in_words(tax, currency, lang="th"),
+		issued=frappe._dict(
+			day=posting_date.day,
+			month=THAI_MONTHS[posting_date.month - 1],
+			year=posting_date.year + 543,
+		),
+	)
@@ -0,0 +1,50 @@
+{#- ERPNext's templates/print_formats/includes/taxes.html, printing the amounts that are posted.
+
+    ERPNext takes an Additional Discount off the items' net amounts (item.distributed_discount_amount;
+    a discount on Grand Total is split between net and taxes) and books each charge at
+    tax_amount_after_discount_amount, while upstream prints the discount as entered and the
+    pre-discount tax_amount, so the lines do not add up to Grand Total.
+
+    Inclusive tax with a discount on Grand Total: the Total line is the tax-inclusive item total
+    and the discount is printed as entered; Total After Discount is then broken down into
+    Net Total and the charges. Otherwise the Total line is the net before the discount, so the
+    discount is its net share, followed by Net Total and the charges. A discount that is not
+    distributed (cash / non-trade) comes off the grand total only and stays after the charges,
+    as upstream. -#}
+{%- macro amount_row(label, value) -%}
+	<div class="row">
+		<div class="col-xs-5 {%- if doc.align_labels_right %} text-right{%- endif -%}">
+			<label>{{ label }}</label>
+		</div>
+		<div class="col-xs-7 text-right">
+			{{ value }}
+		</div>
+	</div>
+{%- endmacro -%}
+{%- macro currency(value) -%}
+	{{ frappe.format_value(value, {"fieldtype": "Currency", "options": "currency"}, doc) }}
+{%- endmacro -%}
+{%- set net_discount = doc.get("items")|map(attribute="distributed_discount_amount")|select|sum -%}
+{%- set gross_discount = net_discount and doc.apply_discount_on == "Grand Total" and doc.flags.show_inclusive_tax_in_print -%}
+
+<div class="row">
+	<div class="col-xs-6"></div>
+	<div class="col-xs-6">
+		{%- if gross_discount -%}
+			{{ amount_row(_(doc.meta.get_label("discount_amount")), "- " ~ doc.get_formatted("discount_amount", doc)) }}
+			{{ amount_row(_("Total After Discount"), currency(doc.total - doc.discount_amount)) }}
+			{{ amount_row(_(doc.meta.get_label("net_total")), doc.get_formatted("net_total", doc)) }}
+		{%- elif net_discount -%}
+			{{ amount_row(_(doc.meta.get_label("discount_amount")), "- " ~ currency(net_discount)) }}
+			{{ amount_row(_(doc.meta.get_label("net_total")), doc.get_formatted("net_total", doc)) }}
+		{%- endif -%}
+		{%- for charge in data -%}
+			{%- if (charge.tax_amount or print_settings.print_taxes_with_zero_amount) and (not charge.included_in_print_rate or doc.flags.show_inclusive_tax_in_print) -%}
+			{{ amount_row(charge.get_formatted("description"), charge.get_formatted("tax_amount_after_discount_amount", doc)) }}
+			{%- endif -%}
+		{%- endfor -%}
+		{%- if doc.discount_amount and not net_discount -%}
+			{{ amount_row(_(doc.meta.get_label("discount_amount")), "- " ~ doc.get_formatted("discount_amount", doc)) }}
+		{%- endif -%}
+	</div>
+</div>
@@ -0,0 +1,22 @@
+{#- ERPNext's templates/print_formats/includes/total.html, paired with the taxes include:
+    with inclusive tax and a discount on Grand Total the Total line is the tax-inclusive item
+    total (the discount is printed as entered below it); with inclusive tax otherwise it is
+    the net before the Additional Discount, since net_total already has the discount's net
+    share (item.distributed_discount_amount) taken off. -#}
+{%- set net_discount = doc.get("items")|map(attribute="distributed_discount_amount")|select|sum -%}
+{%- set gross_discount = net_discount and doc.apply_discount_on == "Grand Total" and doc.flags.show_inclusive_tax_in_print -%}
+<div class="row {% if df.bold %}important{% endif %} data-field">
+	{% if doc.flags.show_inclusive_tax_in_print and not gross_discount %}
+		<div class="col-xs-5 {%- if doc.align_labels_right %} text-right{%- endif -%}">
+			<label>{{ _("Total (Without Tax)") }}</label></div>
+		<div class="col-xs-7 text-right value">
+			{{ frappe.format_value(doc.net_total + net_discount, {"fieldtype": "Currency", "options": "currency"}, doc) }}
+		</div>
+	{% else %}
+		<div class="col-xs-5 {%- if doc.align_labels_right %} text-right{%- endif -%}">
+			<label>{{ _(df.label) }}</label></div>
+		<div class="col-xs-7 text-right value">
+			{{ doc.get_formatted("total", doc) }}
+		</div>
+	{% endif %}
+</div>
@@ -0,0 +1,87 @@
+{#- หนังสือรับรองการหักภาษี ณ ที่จ่าย (Sec. 50 bis certificate) for a Purchase Invoice.
+
+    The Revenue Department's fillable form (approve_wh3_081156.pdf, A4 = 595 x 842 pt) is the page
+    background; every value sits in the rectangle of the corresponding AcroForm field, given here as
+    the PDF's (x0, y0, x1, y1) with the origin at the bottom-left so the numbers can be checked against
+    the form. Two identical copies are printed: copy 1 goes with the payee's tax return, copy 2 is the
+    payee's record. -#}
+{%- set c = get_withholding_certificate(doc) -%}
+{%- set rows = {
+	"1":  {"date": (327, 533, 403, 546), "pay": (411, 533, 490, 547), "tax": (496, 534, 560, 547)},
+	"2":  {"date": (328, 519, 403, 533), "pay": (410, 520, 489, 534), "tax": (496, 519, 560, 532)},
+	"3":  {"date": (328, 504, 403, 518), "pay": (411, 504, 490, 517), "tax": (496, 504, 560, 517)},
+	"4a": {"date": (328, 490, 403, 505), "pay": (412, 490, 491, 504), "tax": (496, 490, 560, 503)},
+	"4b": {"date": (328, 402, 404, 416), "pay": (410, 403, 489, 417), "tax": (497, 403, 562, 416)},
+	"5":  {"date": (327, 216, 403, 230), "pay": (409, 216, 489, 230), "tax": (496, 215, 561, 230)},
+	"6":  {"date": (327, 199, 403, 213), "pay": (409, 199, 489, 213), "tax": (496, 198, 561, 213)},
+} -%}
+{%- set pnd_boxes = {
+	"1": (209, 603, 222, 615),
+	"2": (395, 602, 407, 615),
+	"3": (471, 602, 484, 615),
+	"53": (395, 584, 407, 597),
+} -%}
+{#- Left edges of the printed 13-digit ID boxes (12 pt wide, grouped 1-4-5-2-1), measured on the
+    form; the AcroForm comb field does not line up with them. -#}
+{%- set id_cells = (375, 393, 405, 417, 429, 447.5, 459.5, 471.5, 483.5, 495.5, 513.5, 525.5, 545) -%}
+
+{%- macro box(rect, text, align="left", size=10) -%}
+<div class="f" style="left: {{ rect[0] }}pt; top: {{ 842 - rect[3] }}pt; width: {{ rect[2] - rect[0] }}pt; height: {{ rect[3] - rect[1] }}pt; line-height: {{ rect[3] - rect[1] }}pt; text-align: {{ align }}; font-size: {{ size }}pt;">{{ text }}</div>
+{%- endmacro -%}
+
+{%- macro tick(rect) -%}
+<div class="tick" style="left: {{ rect[0] }}pt; top: {{ 842 - rect[3] }}pt; width: {{ rect[2] - rect[0] }}pt; height: {{ rect[3] - rect[1] }}pt;"></div>
+{%- endmacro -%}
+
+{%- macro tax_id(rect, party) -%}
+	{%- if party.tax_id_digits -%}
+		{%- for digit in party.tax_id_digits -%}
+			{%- set x = id_cells[loop.index0] -%}
+			{{ box((x, rect[1], x + 12, rect[3]), digit, "center") }}
+		{%- endfor -%}
+	{%- elif party.tax_id -%}
+		{{ box(rect, party.tax_id, "center") }}
+	{%- endif -%}
+{%- endmacro -%}
+
+{%- macro amount_row(key) -%}
+	{{ box(rows[key].date, c.date, "center") }}
+	{{ box(rows[key].pay, c.amount, "right") }}
+	{{ box(rows[key].tax, c.tax, "right") }}
+{%- endmacro -%}
+
+{%- for _ in range(2) -%}
+<div class="wht-page">
+	<img class="wht-form" src="/assets/default_thai_company/images/withholding_tax_certificate.png" alt="">
+
+	{#- Invoice reference in the top-right margin; เล่มที่ / เลขที่ are the certificate book's numbers. -#}
+	{{ box((400, 821, 560, 835), doc.name, "right", 8) }}
+
+	{#- ผู้มีหน้าที่หักภาษี ณ ที่จ่าย: the company -#}
+	{{ tax_id((375, 744, 558, 759), c.payer) }}
+	{{ box((54, 729, 316, 745), c.payer.name) }}
+	{{ box((61, 706, 550, 722), c.payer.address or "", "left", 9) }}
+
+	{#- ผู้ถูกหักภาษี ณ ที่จ่าย: the supplier -#}
+	{{ tax_id((375, 676, 558, 690), c.payee) }}
+	{{ box((53, 658, 315, 671), c.payee.name) }}
+	{{ box((59, 627, 550, 643), c.payee.address or "", "left", 9) }}
+
+	{{ tick(pnd_boxes[c.pnd]) }}
+
+	{%- if c.row == "6" %}
+	{{ box((96, 197, 325, 214), c.row_note or "", "left", 8) }}
+	{%- endif %}
+	{{ amount_row(c.row) }}
+	{{ box((409, 180, 488, 196), c.amount, "right") }}
+	{{ box((496, 180, 560, 196), c.tax, "right") }}
+	{{ box((185, 158, 558, 177), c.tax_in_words) }}
+
+	{#- ผู้จ่ายเงิน (1) หัก ณ ที่จ่าย -#}
+	{{ tick((82, 119, 94, 131)) }}
+
+	{{ box((342, 72, 366, 87), c.issued.day, "center") }}
+	{{ box((364, 71, 428, 87), c.issued.month, "center") }}
+	{{ box((429, 72, 470, 87), c.issued.year, "center") }}
+</div>
+{%- endfor -%}
@@ -12,12 +12,15 @@ from default_thai_company.tax_withholding import (
 	LIABILITY_ACCOUNT,
 	OUTPUT_VAT_ACCOUNT,
 	get_payment_entry,
+	get_withholding_certificate,
 	thai_companies,
 )

 COMPANY = "_Test WHT Company"
 ABBR = "_TWC"
 CUSTOMER = "_Test WHT Customer"
+SUPPLIER = "_Test WHT Supplier"
+INDIVIDUAL = "_Test WHT Individual"
 ITEM = "_Test WHT Service"
 FIXTURE = frappe.get_app_path("default_thai_company", "fixtures", "tax_withholding_category.json")
 CUSTOM_DIR = frappe.get_app_path("default_thai_company", "default_thai_company", "custom")
@@ -27,12 +30,13 @@ class TestTaxWithholding(FrappeTestCase):
 	@classmethod
 	def setUpClass(cls):
 		super().setUpClass()
-		# Fixture categories must exist before the company is created so the
-		# Company hook has something to link; force=True re-imports.
-		import_file_by_path(FIXTURE, force=True, data_import=True)
-		for fname in ("sales_invoice.json", "payment_entry.json"):
+		# Custom Fields first: the category fixtures carry income_type. Fixture
+		# categories must exist before the company is created so the Company hook
+		# has something to link; force=True re-imports.
+		for fname in ("tax_withholding_category.json", "sales_invoice.json", "payment_entry.json"):
 			with open(f"{CUSTOM_DIR}/{fname}") as f:
 				sync_customizations_for_doctype(json.load(f), CUSTOM_DIR, fname)
+		import_file_by_path(FIXTURE, force=True, data_import=True)

 		frappe.get_doc(
 			{
@@ -42,6 +46,7 @@ class TestTaxWithholding(FrappeTestCase):
 				"country": "Thailand",
 				"default_currency": "THB",
 				"chart_of_accounts": "Standard",
+				"tax_id": "0105551234567",
 			}
 		).insert()
 		cls.payable = f"{LIABILITY_ACCOUNT} - {ABBR}"
@@ -69,6 +74,35 @@ class TestTaxWithholding(FrappeTestCase):
 			}
 		).insert()

+		supplier_group = frappe.db.get_value("Supplier Group", {"is_group": 0})
+		for name, supplier_type, tax_id in (
+			(SUPPLIER, "Company", "0-1234-56789-01-2"),
+			(INDIVIDUAL, "Individual", "1234567890123"),
+		):
+			frappe.get_doc(
+				{
+					"doctype": "Supplier",
+					"supplier_name": name,
+					"supplier_type": supplier_type,
+					"supplier_group": supplier_group,
+					"tax_id": tax_id,
+				}
+			).insert()
+		frappe.get_doc(
+			{
+				"doctype": "Address",
+				"address_title": SUPPLIER,
+				"address_type": "Billing",
+				"address_line1": "99/9 Moo 5",
+				"address_line2": "Soi Sukhumvit 24",
+				"city": "Khlong Toei",
+				"state": "Bangkok",
+				"pincode": "10110",
+				"country": "Thailand",
+				"links": [{"link_doctype": "Supplier", "link_name": SUPPLIER}],
+			}
+		).insert()
+
 	def make_invoice(self, rate=10000, category=None, inclusive=False):
 		si = frappe.get_doc(
 			{
@@ -121,6 +155,31 @@ class TestTaxWithholding(FrappeTestCase):
 	def withheld(self, pe):
 		return [(t.account_head, t.add_deduct_tax, t.tax_amount) for t in pe.taxes]

+	def make_purchase_invoice(self, supplier, category, rate=100000):
+		pi = frappe.get_doc(
+			{
+				"doctype": "Purchase Invoice",
+				"company": COMPANY,
+				"supplier": supplier,
+				"set_posting_time": 1,
+				"posting_date": "2026-09-16",
+				"due_date": "2026-09-16",
+				"apply_tds": 1,
+				"tax_withholding_category": category,
+				"items": [{"item_code": ITEM, "qty": 1, "rate": rate}],
+				"taxes": [
+					{
+						"charge_type": "On Net Total",
+						"account_head": f"{INPUT_VAT_ACCOUNT} - {ABBR}",
+						"rate": 7,
+						"description": "VAT 7%",
+					}
+				],
+			}
+		)
+		pi.set_missing_values()
+		return pi.insert()
+
 	def category_account(self, category, company=COMPANY):
 		return frappe.db.get_value(
 			"Tax Withholding Account",
@@ -177,6 +236,39 @@ class TestTaxWithholding(FrappeTestCase):
 				doctype,
 			)

+	def test_company_creation_adds_shipping_rule(self):
+		rule = frappe.get_doc("Shipping Rule", f"Shipping Charges - {ABBR}")
+		self.assertEqual(
+			(rule.company, rule.shipping_rule_type, rule.calculate_based_on, rule.account, rule.cost_center),
+			(COMPANY, "Selling", "Fixed", f"Shipping Charges - {ABBR}", f"Main - {ABBR}"),
+		)
+		self.assertEqual(frappe.db.get_value("Account", rule.account, "root_type"), "Income")
+
+	def test_shipping_amount_entered_on_transaction_survives_recalculation(self):
+		rule = f"Shipping Charges - {ABBR}"
+		so = frappe.get_doc(
+			{
+				"doctype": "Sales Order",
+				"company": COMPANY,
+				"customer": CUSTOMER,
+				"transaction_date": nowdate(),
+				"delivery_date": nowdate(),
+				"shipping_rule": rule,
+				"items": [{"item_code": ITEM, "qty": 1, "rate": 1000}],
+			}
+		)
+		so.set_missing_values()
+		so.apply_shipping_rule()
+		(charge,) = so.taxes
+		self.assertEqual((charge.description, charge.tax_amount), (rule, 0))
+
+		charge.tax_amount = 150
+		so.insert()
+		so.apply_shipping_rule()
+		so.save()
+		self.assertEqual([t.tax_amount for t in so.taxes], [150])
+		self.assertEqual(so.grand_total, 1150)
+
 	def test_fixture_reimport_keeps_site_account_and_relinks(self):
 		alt = frappe.get_doc(
 			{
@@ -297,3 +389,34 @@ class TestTaxWithholding(FrappeTestCase):
 		)
 		self.assertEqual(pe.references[0].allocated_amount, 5350.0)
 		self.assertEqual(self.withheld(pe), [(self.receivable, "Deduct", 150.0)])
+
+	def test_certificate_reports_withholding_on_the_category_row(self):
+		pi = self.make_purchase_invoice(SUPPLIER, "WHT 3% - Professional Fee")
+		self.assertEqual(pi.grand_total, 104000.0)  # 100,000 + 7% VAT - 3% withheld
+
+		c = get_withholding_certificate(pi)
+		self.assertEqual((c.row, c.row_note, c.pnd), ("5", None, "53"))
+		self.assertEqual((c.amount, c.tax, c.tax_in_words), ("100,000.00", "3,000.00", "สามพันบาทถ้วน"))
+		self.assertEqual(
+			(c.date, dict(c.issued)), ("16/09/2569", {"day": 16, "month": "กันยายน", "year": 2569})
+		)
+		self.assertEqual((c.payer.name, c.payer.tax_id_digits), (COMPANY, "0105551234567"))
+		self.assertEqual(
+			(c.payee.name, c.payee.tax_id_digits, c.payee.address),
+			(SUPPLIER, "0123456789012", "99/9 Moo 5 Soi Sukhumvit 24 Khlong Toei Bangkok 10110"),
+		)
+
+	def test_certificate_return_follows_payee_type_and_income(self):
+		c = get_withholding_certificate(
+			self.make_purchase_invoice(INDIVIDUAL, "WHT 15% - Interest (Individual)")
+		)
+		self.assertEqual((c.row, c.pnd, c.tax), ("4a", "2", "15,000.00"))
+		self.assertIsNone(c.payee.address)
+
+		c = get_withholding_certificate(
+			self.make_purchase_invoice(INDIVIDUAL, "WHT 15% - Non-Resident Individual")
+		)
+		self.assertEqual((c.row, c.pnd), ("6", "3"))
+		self.assertEqual(
+			c.row_note, "Sec. 40(2)-(6) income paid to non-resident individuals - Sec. 50(2) (P.N.D.3)"
+		)
@@ -50,6 +50,7 @@ Amount,จำนวนเงิน
 Total,รวม
 Total (Without Tax),รวมก่อนภาษี
 Net Total,ยอดรวมสุทธิ
+Total After Discount,ยอดรวมหลังหักส่วนลด
 Total Taxes and Charges,รวมภาษีและค่าธรรมเนียม
 Grand Total,ยอดรวมทั้งสิ้น
 Rounded Total,ยอดรวมปัดเศษ
@@ -59,3 +60,11 @@ Withholding Tax Payable,ภาษีหัก ณ ที่จ่ายค้า
 Withholding Tax Receivable,ภาษีถูกหัก ณ ที่จ่าย
 Output VAT,ภาษีขาย
 Input VAT,ภาษีซื้อ
+Withholding Tax Certificate,หนังสือรับรองการหักภาษี ณ ที่จ่าย
+Type of Income Paid,ประเภทเงินได้พึงประเมินที่จ่าย
+Salary and Wages - Sec. 40(1),เงินเดือน ค่าจ้าง ฯลฯ ตามมาตรา 40(1)
+Fees and Commissions - Sec. 40(2),ค่าธรรมเนียม ค่านายหน้า ฯลฯ ตามมาตรา 40(2)
+Royalties - Sec. 40(3),ค่าแห่งลิขสิทธิ์ ฯลฯ ตามมาตรา 40(3)
+Interest - Sec. 40(4)(a),ดอกเบี้ย ฯลฯ ตามมาตรา 40(4)(ก)
+Dividends - Sec. 40(4)(b),เงินปันผล เงินส่วนแบ่งกำไร ฯลฯ ตามมาตรา 40(4)(ข)
+"Sec. 3 Tera (Services, Rent, Contract Work etc.)",ตามคำสั่งกรมสรรพากรที่ออกตามมาตรา 3 เตรส (ค่าบริการ ค่าเช่า ค่าจ้างทำของ ฯลฯ)
@@ -5,14 +5,14 @@ from frappe.contacts.doctype.address.address import get_default_address, render_
 from num2words import num2words


-def money_in_words(amount, currency):
-	"""Amount in words for the active language.
+def money_in_words(amount, currency, lang=None):
+	"""Amount in words for `lang` (default: the active language).

 	frappe.utils.money_in_words renders "<currency> <words> only." in every
 	language; Thai documents write "<words>บาทถ้วน" or "<words>บาท<words>สตางค์".
 	Currencies num2words cannot spell in Thai keep frappe's wording.
 	"""
-	if frappe.local.lang == "th":
+	if (lang or frappe.local.lang) == "th":
 		try:
 			return num2words(amount, lang="th", to="currency", currency=currency)
 		except NotImplementedError:
Author	SHA1	Message	Date
kurogeek	baff8de0d3	fix: certificate button only on paid Purchase Invoices The certificate is issued when the tax is withheld, i.e. on payment; show the button once the submitted invoice's status is Paid.	2026-09-22 03:58:04 +00:00
kurogeek	2ee381f369	feat: Withholding Tax Certificate button on Purchase Invoice Shown while Apply Tax Withholding Amount is ticked on a saved, not cancelled invoice; downloads the certificate PDF in Thai.	2026-09-22 03:29:54 +00:00
kurogeek	a1ca8439fc	feat: Withholding Tax Certificate print format for Purchase Invoice The Revenue Department's Sec. 50 bis form (approve_wh3_081156.pdf) as the page background, with the invoice's data positioned in the form's fields; two copies per certificate. Its AcroForm fields carry no Thai font, so the PDF is not filled directly. get_withholding_certificate(doc) resolves the payer and payee (13-digit tax ID, one-line address), the certificate row from the category's income_type, the P.N.D. return from the supplier type and income, and the amounts in company currency with the tax in Thai words. Dates are Buddhist Era.	2026-09-22 03:29:54 +00:00
kurogeek	42857b1377	feat: Type of Income Paid on Tax Withholding Category Custom Select income_type: the row of the withholding tax certificate (50 tawi) a payment under the category is reported on, set for every shipped category. Frappe syncs fixtures before customizations on install and migrate, so a fixture value for a Custom Field that does not exist yet is dropped; before_install / before_migrate create the category fields first.	2026-09-22 03:29:39 +00:00
kurogeek	270e44c080	feat: default calendar-year Payroll Period per Thai company	2026-09-18 03:52:35 +00:00
kurogeek	68f0817125	fix: gross discount layout for VAT-inclusive invoices With inclusive pricing and a discount on Grand Total the Total line is the tax-inclusive item total and the discount is printed as entered, followed by Total After Discount, which the Net Total and charge lines then break down. Other cases keep the net layout: Total (net before discount), the discount's net share, Net Total, charges. Thai label for Total After Discount.	2026-09-17 10:30:43 +00:00
kurogeek	4a19c60ba2	fix: print the posted discount and tax amounts ERPNext takes an Additional Discount off the items' net amounts and, for a discount on Grand Total, splits it between net and taxes: each charge is booked at tax_amount_after_discount_amount and Total Taxes and Charges sums those. The print showed the discount as entered and the pre-discount tax_amount, so on a Grand Total discount the VAT line disagreed with the invoice. The totals includes now print the discount's net share (sum of item.distributed_discount_amount), Net Total, and each charge after discount, so the lines add up to Grand Total whichever total the discount applies on and with inclusive or exclusive tax. A discount that is not distributed (cash / non-trade) stays after the charges.	2026-09-17 10:19:30 +00:00
kurogeek	71eda0bec9	fix: print Total, Additional Discount, Net Total in that order Default Standard Sales Invoice and Tax Invoice/Receipt printed the Additional Discount Amount among the charges, after the Total line but with no total after the discount. App copies of ERPNext's totals includes are swapped in via doc.print_templates: - taxes.html: a discount on Net Total is followed by the Net Total line ahead of the charges; a discount on Grand Total stays after them. - total.html: with inclusive tax, "Total (Without Tax)" is the total before the discount (net_total + discount_amount); upstream printed net_total, which already has the discount taken off, so the same figure appeared before and after the discount line.	2026-09-17 10:02:23 +00:00
kurogeek	8cba58ba02	feat: default Shipping Rule per Thai company "Shipping Charges - <abbr>": Selling, Fixed, posting to a "Shipping Charges" income account under Direct Income (created if the chart lacks it) with the default cost center. Shipping Rule is named by its label, so the company abbreviation keeps one rule per company, as ERPNext names its tax templates. Created on Company save, after install, and by a patch for existing companies. The amount is entered on the transaction, not the rule: ERPNext re-applies the rule on every recalculation and would reset the charge row to the rule's fixed amount. ThaiShippingRule overrides the doctype class so a Fixed rule with no amount only seeds the row and leaves the entered amount alone.	2026-09-17 10:02:23 +00:00