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A Tax Invoice (Thai: ใบกำกับภาษี) is the legally required document for VAT-registered customers in Thailand. JingjaiOps generates Tax Invoices that comply with Thai Revenue Department requirements.

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When to issue a Tax Invoice

Issue a Tax Invoice when all of these are true:
  1. Your business is VAT-registered (you have a Thai VAT registration number)
  2. The customer is also VAT-registered (you have their 13-digit Tax ID)
  3. The transaction is subject to VAT (rentals are; pure deposits are not)
If the customer is an individual or a non-VAT-registered business, you don’t need a Tax Invoice — a regular invoice is fine. But many customers will ask for one regardless, and there’s no harm in issuing it.

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Generating a Tax Invoice

A Tax Invoice can be issued from any Sent, Partial, or Paid invoice:
1

Open the invoice

From the Invoices list.
2

Click 'Issue Tax Invoice'

Top right, in the actions menu.
3

Confirm the customer's tax details

JingjaiOps shows the customer’s Tax ID, registered name, and registered address. If anything is missing, you’ll be prompted to add it.
4

Confirm your business tax details

Your business name, Tax ID, and registered address — pulled from Settings.
5

Generate

A Tax Invoice PDF is generated with its own number (TI-YYYY-NNNN).
The Tax Invoice is linked to the original invoice. You can find it on the invoice’s Documents tab.

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Required fields

Thai law requires every Tax Invoice to include: If any required field is missing, JingjaiOps stops you and asks for it before generating.

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PDF format

The Thai Tax Invoice PDF uses the standard Thai format:
  • Header: “ใบกำกับภาษี / Tax Invoice” in large type
  • Below the header: “ต้นฉบับ” (Original) on the original copy, “สำเนา” (Copy) on duplicates
  • Seller block at the top
  • Buyer block on the right
  • Tax Invoice number, date (Buddhist calendar), reference invoice number
  • Line items table
  • VAT calculation block
  • “Total amount in words” line in Thai (read out the grand total in words)
  • Authorized signature line
The PDF is bilingual in headings (Thai primary, English secondary) but customer-facing text is in the language of the customer’s preference.

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Multiple copies

When a Tax Invoice is generated, JingjaiOps creates two PDFs:
  • Original (ต้นฉบับ) — for the customer
  • Copy (สำเนา) — for your records
Both are stored on the invoice’s Documents tab. You only send the Original to the customer; keep the Copy for tax filings.

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Voiding a Tax Invoice

If a Tax Invoice is issued in error or the underlying invoice is voided, you must void the Tax Invoice as well:
1

Open the Tax Invoice

From the original invoice’s Documents tab.
2

Click 'Void'

A reason field is required.
3

Issue a credit note (if needed)

For a partial credit, generate a CN-YYYY-NNNN credit note instead of voiding.
Voided Tax Invoices are kept in the archive — Thai law requires you to retain them, including the void reason.
For invoices that span pre-payment and final settlement, talk to your accountant about whether to issue Tax Invoices per payment or once at the end. JingjaiOps supports both approaches.