An expatriate with income in Thailand and abroad living in Udon Thani — where do you start?

The point raised here is “An expatriate with income in Thailand and abroad living in Udon Thani”, so it flags what usually causes documents like this to be rejected before summarising the general practice. What changes the timeline most here is whether the source documents are complete on day one. What sets this case apart is the number of certified sets and the window in which they must be used. Before starting, verify the source document is still within any validity window the recipient applies, then count the number of certified sets needed before work starts, because extra sets restart the certification steps, then confirm with the receiving body whether it wants an original, a certified copy or a certified translation. The specifics here are location: Udonthani, and those decide which translation and certification level applies. The terms that frame this page are expatriate · income · Thailand · abroad. The next step is confirming the filing channel and the copy or file format required. Documents with a short validity window should be produced as close to the filing date as possible. With a fixed filing date, count backwards from it and book each certification step in reverse. Note who signed each certification and on what date for later reference. If the receiving body confirmed its requirements by email, keep that message with the file. Tax in Thailand is governed by the Revenue Code and administered by the Revenue Department under the Ministry of Finance, which is also the body that issues official tax evidence. Documents you rely on abroad should therefore be issued or certified by the Revenue Department rather than self-prepared, because receiving tax authorities check for the seal or signature of an authorised officer. Thai tax and accounting documents used abroad are normally translated in full — including seals and signatures — then the translation is certified by the Legalisation Division, Department of Consular Affairs, Ministry of Foreign Affairs, and finally legalised at the destination embassy or consulate where that country requires it. Thailand is not a party to the 1961 Apostille Convention, so no apostille is issued on Thai documents. The two documents foreign tax authorities ask for most often are the Certificate of Residence (form R.O.22) and the Certificate of Income Tax Payment / withholding (form R.O.21), both issued by the Revenue Department. They are the standard evidence for claiming relief under a double taxation agreement; confirm with your area revenue office which application form and supporting papers are needed before you start. Cost and lead time depend on page count, target language, how many certified sets are required and the steps the receiving authority sets, so every file is quoted before work starts. Send scans of every page together with the letter or form the tax authority sent you, via LINE @Thainotary, call +66 094-895-8999 or email contact@thainotary.co.th.

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