US tax, Social Security & retirement advice for American expats living in Thailand

Yes. US citizens and green card holders are taxed on worldwide income wherever they live, so you file a federal return every year if you are over the filing threshold. Americans abroad get an automatic extension to 15 June, though any tax owed still accrues interest from 15 April.

The Foreign Earned Income Exclusion (up to $132,900 for 2026) only covers earned income such as wages. It does not cover pensions, IRA or 401(k) withdrawals, or investment income. The foreign tax credit is what usually prevents the same income being taxed twice.

If you spend 180 days or more in Thailand in a calendar year you are Thai tax resident. Since 1 January 2024, foreign income you bring into Thailand is generally taxable there, whichever year it was earned. Under the US–Thailand tax treaty, US Social Security is taxed only by the US, while private pensions such as 401(k) and IRA withdrawals are generally taxed in the country where you live, so a withdrawal you send to Thailand can be taxed there.

A proposal to exempt income remitted in the year it is earned or the year after has not been enacted as at the latest sources we checked.

It depends. Original Medicare generally does not cover care you receive in Thailand, and you are not enrolled in Part B automatically if you are abroad. But if you delay and later return to the US, your premium rises by 10% for every full 12 months you could have had Part B, for life. The standard 2026 premium is $202.90 a month, so the choice is between paying for cover you may not use and a permanent penalty. We run the numbers for your plans.

Generally no. Medicare does not usually pay for services outside the US, so most Americans in Thailand rely on Thai private health insurance, which is also required for the retirement visa. Check any Medicare Advantage or supplement plan you hold, as some have limited travel cover but they are not designed for residents abroad.

Probably. You must file an FBAR (FinCEN 114) if the combined value of your foreign financial accounts exceeded $10,000 at any time in the year. Separately, if you live abroad you file Form 8938 with your return once your foreign assets pass $200,000 at year-end or $300,000 at any time (single), or $400,000 and $600,000 if married filing jointly. Penalties for missing these forms can be severe even where no tax is due.

The federal estate tax exemption is $15 million per person from 2026, so many Americans owe none, but if your spouse is not a US citizen the unlimited marital deduction is usually unavailable and a qualified domestic trust (QDOT) may be needed. Assets in Thailand are generally dealt with under Thai succession law, so many expats keep a Thai will alongside their US will, worded so one does not cancel the other. Thai inheritance tax only applies above ฿100 million and spouses are exempt. Foreigners generally cannot own land in Thailand, and condominium ownership is subject to a foreign quota.

US citizens living abroad can generally keep receiving Social Security, usually by international direct deposit or into a US account, and receive the same annual cost-of-living adjustments as in the US. Rules differ for non-citizens, so tell us your citizenship status. Confirm payment arrangements with the Social Security Administration.

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