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.
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.
Location fixture: "All Locations" group with Head Office, Branch Office and
Warehouse. Fixture import re-inserts tree nodes with fresh lft/rgt, which
strands locations users add beneath them, so after_migrate rebuilds the
Location tree.
Asset Category fixture: Land (non-depreciable), Buildings (20 years),
Plant and Machinery, Vehicles, Furniture and Fixtures, Office Equipment,
Computers and Electronics, Software (5 years) and Intangible Assets
(10 years), per Royal Decree 145 rates; monthly straight-line, daily
pro-rata. The accounts table is company-specific and therefore not
shipped: an Asset Category before_import hook links every Thai company
(same contract as the WHT categories), reusing the Standard chart's
fixed asset accounts and creating Land, Vehicles and Intangible Assets
under Fixed Assets. Company.on_update links new companies. Depreciation
accounts are left to the Company defaults.
get_or_create_account now takes account_type and parent_groups.
Per Thai company: Thailand VAT 7%, Thailand VAT 7% (Included) for
VAT-inclusive pricing, Thailand VAT 0% for zero-rated supplies. Sales
schemes post to Output VAT, purchase schemes to Input VAT (category
Total, so recoverable VAT stays out of valuation). The 7% scheme is the
default when the company has none. Created on Company save, after
install, and by a patch for existing companies.
Thai VAT is filed on P.P.30 as output tax (ภาษีขาย, collected on sales)
net of input tax (ภาษีซื้อ, paid on purchases); ERPNext's wizard makes a
single VAT account. Both join the per-company tax accounts created on
Company save and fixture import; a patch adds them to existing companies.
Account names are translated for the chart of accounts tree.
- translations/th.csv: custom field labels, messages, print format and
letter head text, the 22 Tax Withholding Category names; 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 font
- letter head labels go through _()
- withholding row description is translated when stored
- in_words: Thai "...บาทถ้วน" wording via num2words when the language is
Thai (ThaiSalesInvoice.set_total_in_words); print formats re-derive it
in the print language (get_in_words)
- fixture `modified` bumped so migrate re-imports the changed documents
frappe.call filters kwargs to the target signature; the *args/**kwargs
wrapper accepted 'cmd' and forwarded it to ERPNext's function. Mirror
the original signature.
Tick Apply Tax Withholding Amount on unsaved customer receipts whose
references include a Sales Invoice carrying withholding: in the
get_payment_entry override (Create > Payment), in the
allocate_amount_to_references doc method (Get Outstanding Invoices /
Paid Amount changes, so the tax row updates live) and on first save.
Saved entries keep the user's choice; unticking now removes the row.
Client script recomputes the row when the checkbox or category changes.
With a deduction row ERPNext treats Paid Amount as cash received and
credits the party for paid + deduction, so a gross Paid Amount (what Get
Outstanding Invoices fills) over-credited Debtors and posted the gross
to the bank. Use the taxes table with add_deduct_tax=Deduct like
supplier TDS: Paid Amount is the gross settlement, bank receives paid
minus withholding, receivable is debited. Override Payment Entry
build_gl_map to flag the bank entry post_net_value so the merged bank
line shows the net amount.
Custom fields Tax Withholding Category (fetched from Customer),
Withholding Tax and Net Payable After Withholding Tax on Sales Invoice;
computed in the Thai set_tax_withholding override from the category
rate and single threshold, informational only (totals/GL unchanged),
printed under Rounded Total by the standard layout. Payment Entry now
prefers each invoice's category over the customer's.
Thai customers withhold tax at payment; ERPNext's customer-side handling
is Indian TCS which adds tax on top of the Sales Invoice. Override
SalesInvoice.set_tax_withholding to no-op for Thai companies, expose
"Apply Tax Withholding Amount" on Customer/Receive Payment Entries, and
on validate compute rate x pre-VAT amount of each allocated reference
(prorated, single threshold honoured) as a deduction to "Withholding Tax
Receivable". Client script fetches the Customer's category when the box
is ticked.
Add 22 Tax Withholding Category fixtures covering Thailand domestic
withholding (Taw.Paw. 4/2528, Sec. 50(2), Sec. 70) with rates and
thresholds. Fixtures ship without accounts; on import each Thai company
gets "Withholding Tax Payable" (Liability) and "Withholding Tax
Receivable" (Asset) created and the payable account linked. Company
on_update does the same for companies created later. Site-configured
accounts survive fixture re-import on migrate.
kurogeek