Prepare US and Thai tax records

Practical guide

Who this is for

US citizens and US tax residents receiving retirement income, transferring savings or holding Thai bank accounts.

Eligibility and coverage rules

• Thailand's Revenue Code uses 180 days or more in a calendar year, accumulated across visits. Visa labels are not a substitute for counting days. Thai-source income has its own rules, even for nonresidents.
• The Revenue Department's foreign-income guidance addresses income earned from January 1, 2024 onward during a year of Thai tax residence and brought into Thailand, including later-year remittances. Its chart distinguishes pre-2024 income and income earned in a nonresident year. Treaty relief still needs a separate analysis.
• US citizens and resident aliens generally remain within worldwide-income reporting rules. Filing thresholds, exclusions and credits determine the actual return and tax result; 'tax-free benefit' is not the same as 'no reporting obligations'.

Important limits

An ATM withdrawal, mixed savings account or foreign-card spending can make tracing harder. Do not assume that only a wire into a Thai bank can matter; have unusual remittance methods reviewed.

Find the correct tax filing route

1. For Thailand, first identify the income category and whether a return is required. Use the Revenue Department's tax-year-specific forms, rather than assigning every foreign pension to salary-only P.N.D.91.
2. General assessable-income returns use P.N.D.90; the government filing guide distinguishes the salary-only P.N.D.91 and the P.N.D.94 midyear return for certain income categories. Annual filing is normally January through March of the following year; verify any year-specific extension rather than assuming an online grace period.
3. The Revenue Department's 2026 forms page includes an Income Declaration for Foreign-Sourced Income. Download the relevant year's current return and attachments when filing; do not use an older sample as a completed current-year return.
4. For the US, determine Form 1040/1040-SR filing requirements separately. The qualifying overseas automatic two-month extension normally moves April 15 to June 15, but interest can still run from the regular due date. Confirm qualification and attach the required explanation. Filing dates may shift for weekends, holidays or specific relief.
5. Use treaty and foreign-tax-credit forms only after classifying each payment. Neither a VA award nor an SSA statement by itself determines the Thai filing treatment.

Official forms and instructions

• Thai government filing schedule and form categories
• Revenue Department: 2026 forms
• IRS overseas filing-extension rules

Documents checklist

• Confirm the eligibility or treatment that applies to your household.
• Gather the records described above and store them privately.
• Check the current official source before acting.
• Keep a dated copy of applications, agency replies and confirmations.