If you file a Thai personal income tax return and request a refund, you may want to know how to check its status, whether supporting documents are needed, and how a refund is paid. The answer depends on your return and the Revenue Department’s review. This guide explains where to check and what to prepare, with links to official guidance.
Check your return in D-MyTax
The Revenue Department’s D-MyTax portal brings together services for personal income tax returns, including refund status and document submission. The official guidance describes access through an RD ID with the required identity verification, or through supported Digital ID options such as ThaID, Paotang, or a bank’s NDID service. Available sign-in methods can change, so follow the current instructions shown by the Revenue Department.
Sign in to D-MyTax
Open the Revenue Department website and choose D-MyTax (One Portal). Sign in using an available identity-verification method and follow the on-screen steps. Do not share passwords, one-time codes, or identity documents through an unsolicited message.
Follow the refund status
In D-MyTax, open the refund-status and document-submission service. The portal can show information about the submitted return, requested documents, and refund status for your case.
If your return does not request a refund
If you did not request a refund, or your return shows additional tax due, you will not be waiting for a refund from that filing. Check the status and figures in your own account if the result is unclear.
Do you need to submit supporting documents?
Not in every case. The Revenue Department may review the information on your return and ask for additional evidence where needed. Check D-MyTax for a request that applies to your filing and use the submission route specified by the department.
When documents may be needed
If the department needs to verify information or a deduction, it may ask you to provide supporting documents. The documents depend on your income, deductions, and the details of your claim.
Submit documents through the stated channel
Follow the instructions shown for your refund case. The Revenue Department’s guidance explains how to submit documents online through D-MyTax and also lists other submission channels for certain filings. Do not assume that sending documents before they are requested will speed up every case.
Why complete documents matter
Clear, complete documents can help the department review the information it requested. Keep a copy of what you submit and check the portal for updates or any further request.
How long can a tax refund take?
The time depends on the claim and whether the Revenue Department needs to review or verify supporting information. The three-month period described in official guidance applies to specified cases; it is not a promised payment date for every return.
The official three-month period
The Revenue Department says it will process a refund within three months when clear documents show that tax was overpaid, paid incorrectly or more than once, or that the taxpayer had no tax liability. The period runs from receipt of a refund request made through a personal income tax return that requests a refund, or through form C.10. See the Revenue Department’s official tax-refund guidance (in Thai) for the conditions and current instructions.
If additional documents are requested
Submit the requested information through the channel and by the date shown for your case. The official three-month statement is conditional; check D-MyTax or contact the Revenue Department if you need to know how a document request affects your specific timeline.
Prepare the information requested
Read the request carefully and provide documents that are legible and complete. Keep the submission confirmation so you can refer to it later.
Which documents might be requested?
Requirements vary with the type of income, deductions, and refund claim. Use the request in your account as the source of truth rather than sending unrelated personal documents.
Information that may already be available
Some information, such as income or withholding data reported by an employer, may already appear in the Revenue Department’s system. Check the information shown for your return before submitting duplicate documents.
Additional supporting documents
Depending on your return, the department may ask for evidence of other income or documents supporting deductions, such as eligible child or parent expenses, insurance premiums, mutual-fund purchases, or other claimed expenses.
Examples of possible evidence
Examples can include an identity document, household registration, insurance-premium certificate, investment-fund purchase certificate, medical receipt, or other evidence relevant to a deduction. Submit only what the department requests, using an official channel.
How are Thai tax refunds paid?
The Revenue Department lists different payment routes depending on the taxpayer and the refund request.
PromptPay bank transfer
Eligible Thai individuals who have registered PromptPay with their 13-digit national ID and requested payment to that bank account may receive an approved refund by bank transfer. Confirm that the registration and refund preference are correct in your case; a bank transfer does not guarantee a particular processing time.
Refund notice K.21
For some cases where a PromptPay transfer is not used, the Revenue Department may issue a personal income tax refund notice (K.21) for collection through the listed bank branches. Follow the instructions on the notice and the current official guidance.
Why people use PromptPay
A registered PromptPay account can make payment more direct for eligible applicants. Check the Revenue Department’s current rules to confirm that this route applies to you.
Summary
To follow a Thai tax refund, check D-MyTax, respond to requests through an official channel, and confirm which payment method applies to your case. Refund timing and required evidence depend on the filing and review.
- Review the return and refund status in D-MyTax.
- Check which supporting documents the Revenue Department has requested.
- Submit clear, complete documents through the stated official channel.
- Treat the three-month period as conditional official guidance, not a guaranteed payment date for every claim.
- Confirm whether PromptPay transfer or a K.21 notice applies to your case.
The Revenue Department’s My Tax Account FAQ says its officials do not contact taxpayers by phone or LINE, or send app-download links, about tax filing, payment, or refunds. Use the department’s official website and verified services; see the Revenue Department’s My Tax Account FAQ (in Thai). If you need help with a particular claim, contact the Revenue Department or a qualified tax professional.
Read the Revenue Department’s current tax-refund guidance (Thai).
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