Thai Tax for Expats: Income Source, Residence and Transfers

Thai tax becomes easier to understand when you separate three questions: where the income comes from, whether you are Thai tax resident, and whether genuinely foreign-source income has been brought into Thailand. Your passport, visa and bank account do not answer all three.

This guide was reviewed on 5 October 2026. It explains the general framework for individuals and the records worth keeping. Pensions, investment gains, remote work and treaty relief can need a closer review of your facts; a general article cannot calculate everyone's tax bill.

The 180-day test is about a calendar year

Section 41 of the Revenue Code treats a person staying in Thailand for a total of 180 days or more in a tax year as resident. Count all relevant stays in the calendar year, not just one visit or the validity of a visa.

Keep a travel log backed by passport and immigration records. Immigration permission and tax residence are different concepts. Someone may have a long-stay visa but spend little time in Thailand, or become tax resident across several shorter visits.

Being below 180 days does not automatically mean no Thai tax. Income from work performed, business carried on or property located in Thailand can be taxable even for a non-resident.

Start with the income source, not the payment account

The Revenue Department's guidance for foreigners explains that Thai-source income can be taxed whether paid inside or outside Thailand. A salary paid into a European account is not automatically foreign-source if the work is performed in Thailand.

List each stream separately: employment, freelance work, rent, pension, interest, dividends or asset sales. Have the category and source reviewed rather than treating every overseas payment as the same thing. Our remote-work business guide deals with the work-location problem.

The old “send it next year” advice is outdated

For genuinely foreign-source income, the Revenue Department's guidance sets out two conditions: the income arose from 1 January 2024 while the person was Thai tax resident, and it was brought into Thailand. That remittance can happen in a later tax year.

The same guidance distinguishes foreign income earned before 1 January 2024, and foreign income earned in a year when the person was not Thai tax resident. Keep evidence of those dates and residence status; do not assume the receiving bank can classify the funds for you.

A transfer can contain different things: original capital, older savings and later income. Moving your own money between accounts does not by itself tell you which part is taxable income. Preserve the history, rather than labelling the whole transfer “savings” after it arrives.

Read the tax bands as slices, not one flat rate

Ordinary personal income tax is progressive. The bands below apply to annual net taxable income after the relevant expense deductions and allowances, not automatically to gross salary or every remitted baht. The Revenue Department publishes the rate table applicable from tax year 2017 onward; its current statutory schedule places the 35% band above 5 million baht.

Annual net taxable income, baht	Rate on that slice
First 150,000	Exempt
Over 150,000 to 300,000	5%
Over 300,000 to 500,000	10%
Over 500,000 to 750,000	15%
Over 750,000 to 1,000,000	20%
Over 1,000,000 to 2,000,000	25%
Over 2,000,000 to 5,000,000	30%
Over 5,000,000	35%

For an illustration, exactly 1 million baht of net taxable income gives 115,000 baht under that progressive calculation before credits. The 20% band applies only to the last slice above 750,000 baht, not to the whole million. Other computations can apply to particular non-employment income; ask an accountant to check the required calculation.

Filing thresholds and the first tax-exempt band are not the same thing. You may need to submit a return even when deductions or credits leave no tax to pay. Conversely, merely living in Thailand does not mean every person must file a zero return regardless of income.

Foreign tax relief needs the right evidence

Do not simply subtract every tax paid abroad from your Thai bill. Check the applicable double-taxation agreement, the income category, residence under the treaty, the permitted taxing rights and credit limit.

The Revenue Department's foreign tax credit tool and guidance provide a practical starting point. A credit is not necessarily an exemption, and it cannot be assumed to cover social contributions or tax unrelated to the income being assessed.

Keep the foreign return, assessment and proof of tax actually paid, together with income and remittance records. If two countries use different tax years or taxes are later refunded, ask how the amounts should be matched and adjusted. A transfer receipt alone is not a tax-payment certificate.

Special relief is specific, not a feature of every visa

LTR categories have different tax provisions. The programme's official benefits table distinguishes the overseas-income exemption for the listed Wealthy Global Citizen, Wealthy Pensioner and Work-from-Thailand categories from the 17% personal income-tax provision for Highly Skilled Professionals. Conditions and the qualifying income still need review.

Do not extend those provisions to every retiree, DTV holder, dependent or foreign worker. Our Premium tax planning guide explains how to compare relief without invented savings claims.

Digital-asset gains also have specific rules. See the Thailand crypto guide before assuming that all gains face a flat tax or that all crypto receipts are exempt.

Prepare for filing while the records are easy to find

Personal returns commonly use P.N.D.90 for income not limited to employment, or P.N.D.91 for employment-only income. P.N.D.50 is a company return, not the normal form for your personal salary. Check the correct tax-year form, attachments, filing obligation and deadline using the Revenue Department's 2026 forms page and current filing guidance.

• Keep your tax identification details and travel-day log.
• Reconcile income records with bank and investment statements.
• Separate Thai-source income from genuinely foreign-source income.
• Record foreign income dates, remittances, principal and eligible relief.
• Collect Thai withholding certificates and foreign tax-payment evidence.
• Keep the filed return, calculation and payment or refund records.

Store a restricted backup using the habits in our document-organisation guide. If you discover an earlier mistake, ask about correcting the return. Do not rely on a guessed bank-reporting threshold or the idea that a small transfer cannot be questioned.

Common questions

Does staying fewer than 180 days guarantee no Thai tax?

No. The 180-day test concerns Thai tax residence. Thai-source income can still be taxable for a non-resident, subject to the applicable rules and any valid relief.

Does remitting foreign income in the next year make it tax-free?

No general next-year exemption applies to post-1 January 2024 foreign income earned while Thai tax resident. The Revenue Department explains that qualifying income can be taxed when remitted in a later year.

Is the 35% personal tax band applied to all income?

No. Under the ordinary progressive schedule, 35% applies to the slice of annual net taxable income above 5 million baht. Lower slices have lower rates or exemption.