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How to apply for an ITIN from Thailand
You apply for an ITIN with IRS Form W-7, Application for IRS Individual Taxpayer Identification Number. In most cases the W-7 is sent together with the US federal tax return that needs the ITIN, unless you qualify for one of the IRS exceptions (for example certain tax-treaty or withholding situations).
What the application includes
- A completed Form W-7 with the reason you need an ITIN.
- Your identity documents — usually your passport. The IRS only accepts originals or copies certified by the agency that issued them; ordinary or notarised photocopies are not accepted.
- The tax return, or the documents that prove you qualify for an exception.
If you'd rather not mail your original passport, an IRS Certifying Acceptance Agent (CAA) can verify it and send certified copies instead.
How long it takes
Once the application reaches the IRS, it usually takes around 7–11 weeks, and up to about 13 weeks during the US tax season (roughly January to April). The IRS confirms your new number in a letter called notice CP565.
Applying with TinTax
- Choose your service and pay securely by PromptPay or bank transfer.
- Fill in one guided form in Thai or English and upload your documents — everything is encrypted.
- Our team reviews everything and files your application with the IRS.
- Track each step in your dashboard; we tell you as soon as your ITIN is ready.
Ready to apply?
TinTax prepares and files your ITIN application from Thailand — one guided form, secure upload, and updates at every step.
See prices and apply →More guides
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- Opening a US bank account from Thailand: your options
- Filing a US tax return (1040-NR) from Thailand
- Getting paid in US dollars in Thailand: bank transfer, Wise, Payoneer or PayPal
General information only — not tax or legal advice. TinTax is not affiliated with the IRS.