This tool generates a completed Thai withholding tax certificate (หนังสือรับรองการหักภาษี ณ ที่จ่าย, the 50 bis form) as an Excel file: all four official copies pre-filled in Thai, ready to print, sign and stamp, plus an English copy so you can check what you are signing.

In Thailand, when a business pays for services, rent, advertising and many other expenses, it must deduct withholding tax from the payment (usually 1 to 5%), give the supplier a certificate proving the deduction, and send the deducted tax to the Revenue Department. The supplier uses the certificate to claim that tax back as a credit. This generator does the paperwork: enter the details from the invoice once, and the certificate comes out completed and correctly formatted.