Is my withheld tax creditable or refundable?
Yes, usually — withholding tax that was deducted from your payments acts as a tax credit against the income tax due on your annual return. If the total withheld during the year is more than the tax you actually owe, the excess is generally refundable. The key condition is that you keep every 50 ทวิ (50 Bis) certificate your clients issued, as evidence of the tax withheld. Your actual refund depends on your total income, your deductions, and the tax owed for the whole year, so the figure here is an estimate. Confirm with the Revenue Department or your accountant before filing — this is general information, not tax advice.
Enter the total tax withheld from you this year (or per invoice) to see how, in general, that amount works as a tax credit.
Claiming the credit or refund depends on keeping all your 50 Tawi certificates. BillsOS totals the withholding across your documents so the annual return is easier to file.
Track your withholding automatically →
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What to know before you file
Keep every 50 Tawi
Withholding credits need evidence. Missing certificates can mean the credit is rejected — confirm with rd.go.th or hotline 1161.
A refund is not always the full amount withheld
If annual tax due still exceeds total withholding, you get a credit against tax owed — not necessarily a cash refund of the full withheld amount. General information, not tax advice.
BillsOS only formats and computes documents for you. This is general information, not tax advice — please confirm with the Revenue Department or your accountant.