Thailand Income Tax Guide 2026: Brackets, Deductions & Filing

Who Must File a Thai Personal Income Tax Return

If you earn income in Thailand — whether you are Thai or foreign — you likely have a legal obligation to file a personal income tax return (PIT) with the Revenue Department. Filing requirements are broader than most people realize, and even those who owe zero tax may still need to file.

Income Thresholds for Filing

For tax year 2569 (BE 2569 / CE 2026), you must file a return if your annual income meets or exceeds:

• Employment income (salary, wages): ฿120,000/year or more (roughly ฿10,000/month)
• Other income (freelance, business, rental, investment): ฿60,000/year or more
• Married couples: Each spouse’s income is evaluated separately against the thresholds above

Non-Residents and Foreigners Working in Thailand

If you are a non-Thai national earning income from sources within Thailand, you are subject to Thai personal income tax on that Thai-sourced income — regardless of whether you physically reside in Thailand.

If you spend 180 days or more in Thailand during a tax year, you are classified as a tax resident. As of January 1, 2024, tax residents must also pay Thai income tax on foreign-sourced income that is remitted to Thailand — even if the income was earned in a prior year.

Thailand Personal Income Tax Brackets 2026

Thailand uses a progressive tax rate system, meaning your income is taxed in tiers. The first portion of your net income is taxed at a low rate (or exempted entirely), while higher portions are taxed at progressively higher rates. You do not pay the highest rate on your entire income — only on the portion that falls within that bracket.

Here are the personal income tax brackets for tax year 2569 (2026):

Net Taxable Income (฿/year)	Tax Rate	Max Tax in Bracket	Cumulative Tax
0 - 150,000	Exempt	฿0	฿0
150,001 - 300,000	5%	฿7,500	฿7,500
300,001 - 500,000	10%	฿20,000	฿27,500
500,001 - 750,000	15%	฿37,500	฿65,000
750,001 - 1,000,000	20%	฿50,000	฿115,000
1,000,001 - 2,000,000	25%	฿250,000	฿365,000
2,000,001 - 5,000,000	30%	฿900,000	฿1,265,000
5,000,001 and above	35%	—	—

Key Takeaways

• The first ฿150,000 of net income is tax-free for everyone
• A person earning ฿500,000 net/year pays a maximum of ฿27,500 in tax (effective rate: just 5.5%)
• A person earning ฿1,000,000 net/year pays ฿115,000 (effective rate: 11.5%)
• Your effective (average) tax rate will always be lower than the marginal rate of your highest bracket

Key Tax Deductions and Allowances for 2026

Deductions are the most powerful tool for reducing your tax bill legally. Every baht you can deduct reduces your net taxable income, which directly lowers the amount of tax you owe. Here are all the major deductions available to individual taxpayers in Thailand.

Personal and Family Allowances

Deduction	Amount
Personal allowance	฿60,000
Spouse allowance (spouse has no income)	฿60,000
Child allowance (1st child)	฿30,000 per child
Child allowance (2nd child onward, born from 2018)	฿60,000 per child
Pregnancy and childbirth expenses	Actual cost, max ฿60,000 per pregnancy
Parental care (parents aged 60+, no income)	฿30,000 per parent

Insurance and Savings Deductions

Deduction	Maximum	Conditions
Life insurance premiums	฿100,000	Policy must be 10+ years
Health insurance premiums	฿25,000	Combined with life insurance, total cannot exceed ฿100,000
Parents’ health insurance	฿15,000	Parents must earn less than ฿30,000/year
Social Security contributions	฿9,000	Actual amount (5% of salary, max ฿750/month)
SSF (Super Savings Fund)	฿200,000	Minimum 10-year holding period
RMF (Retirement Mutual Fund)	30% of income, max ฿500,000	Must invest continuously; withdrawal at age 55
PVD (Provident Fund)	15% of salary	Combined with RMF, included in ฿500,000 cap

Property, Donations, and Other Deductions

Deduction	Maximum
Home loan interest	฿100,000
General donations	Up to 10% of net income after other deductions
e-Donation (electronic donation system)	Double deduction (2x the donated amount)
Political party donations	Up to ฿10,000
Shop Dee Mee Khuen stimulus (if applicable in 2026)	As announced by the Revenue Department

Step-by-Step: How to Calculate Your Thai Income Tax

Calculating your personal income tax is straightforward once you understand the formula. Here is the core equation:

Net Income = Gross Income - Expense Deduction - Personal Deductions

Worked Example: Monthly Salary of ฿50,000

Let us walk through a complete calculation for a single employee earning ฿50,000 per month with Social Security contributions and a ฿100,000 SSF investment.

Step 1: Calculate Total Annual Income

Monthly salary ฿50,000 x 12 months = ฿600,000

Step 2: Subtract Expense Deduction

For employment income (Section 40(1)), you can deduct 50% of income as expenses, up to a maximum of ฿100,000.

฿600,000 x 50% = ฿300,000 → exceeds the cap, so the deduction is ฿100,000

Step 3: Subtract Personal Deductions

Deduction	Amount
Personal allowance	฿60,000
Social Security (฿750 x 12)	฿9,000
SSF investment	฿100,000
Total deductions	฿169,000

Step 4: Calculate Net Taxable Income

฿600,000 - ฿100,000 - ฿169,000 = ฿331,000

Step 5: Apply Progressive Tax Brackets

Income Bracket	Amount	Rate	Tax
0 - 150,000	150,000	Exempt	฿0
150,001 - 300,000	150,000	5%	฿7,500
300,001 - 331,000	31,000	10%	฿3,100
Total tax payable			฿10,600

What If You Skip the SSF Investment?

Without the ฿100,000 SSF investment, your net income would be ฿600,000 - ฿100,000 - ฿69,000 = ฿431,000. Your tax would increase to ฿0 + ฿7,500 + ฿13,100 = ฿20,600 — that is ฿10,000 more in tax. The ฿100,000 SSF investment saves you ฿10,000 in tax while also generating investment returns. It is one of the most effective tax-saving tools available.

How to File Your Thai Income Tax Return

Choose the Right Form

• PND 91 (ภ.ง.ด.91) — For individuals with salary income only (Section 40(1) income). This is the form most employees use.
• PND 90 (ภ.ง.ด.90) — For individuals with multiple income types, such as salary + freelance income + rental income + dividends + online sales, or any income from Sections 40(2) through 40(8).

Filing Online via rd.go.th (Step-by-Step)

1. Go to efiling.rd.go.th or use the RD Smart Tax mobile app
2. Register or log in using your Digital ID or taxpayer identification number
3. Select the correct form (PND 90 or PND 91)
4. Enter your income details as shown on your withholding tax certificate (50 Tawi form / ใบ 50 ทวิ)
5. Enter all deductions and allowances you are claiming
6. The system calculates your tax automatically — review for accuracy
7. Confirm and submit
8. If you owe additional tax, pay via e-Payment, QR code, or bank counter
9. If you overpaid (tax refund due), the refund will be deposited into your bank account within 3-6 months

Documents You Will Need

• Withholding tax certificate (50 Tawi / ใบ 50 ทวิ) — Request from every employer you worked for during the tax year
• Deduction evidence — Life/health insurance premium receipts, SSF/RMF/PVD fund certificates, home loan interest statement from your bank
• Donation receipts — Paper receipts or automatic verification via the e-Donation system
• Bank account details — For receiving any tax refund

Filing Deadlines

Filing Method	Deadline
Paper filing at Revenue Department office	March 31 of the following year
Online filing via efiling.rd.go.th	April 8 of the following year (8-day extension)

For income earned in tax year 2569 (2026), the deadlines are March 31, 2027 (paper) and April 8, 2027 (online).

Legal Tax-Saving Strategies for Thailand

Smart tax planning is not about evasion — it is about claiming every deduction you are legally entitled to. These strategies can meaningfully reduce your tax bill, and they are all fully compliant with Thai tax law.

1. Maximize SSF and RMF Contributions Before Year-End

SSF and RMF funds are the most powerful tax-saving instruments available to Thai taxpayers. The earlier in the year you invest, the more time your money has to grow. However, contributions must be made by December 31 to qualify for that tax year’s deduction.

• SSF: Deduct up to ฿200,000, with a 10-year holding period
• RMF: Deduct up to 30% of income, max ฿500,000, withdrawable at age 55
• Choose funds with low expense ratios and solid long-term track records

2. Buy Life and Health Insurance for Dual Benefits

Life insurance (10-year+ policies) qualifies for up to ฿100,000 in deductions, while health insurance adds up to ฿25,000. Beyond the tax savings, you gain actual financial protection. This is a rare case where a tax deduction also directly benefits your well-being.

3. Use the e-Donation System for Charitable Giving

If you already donate to qualified organizations, switching to the Revenue Department’s e-Donation platform gives you a double deduction (2x the actual donation). A ฿10,000 donation becomes a ฿20,000 deduction. The system generates receipts automatically — no paperwork needed.

4. Timing Matters: Act Before December 31

All deductions must occur within the tax year to qualify. This means:

• Purchase SSF/RMF → before December 31
• Pay insurance premiums → ensure all payments are processed before year-end
• Make e-Donations → complete before December 31
• Gather home loan interest certificates from your bank

5. Plan as a Couple

If both spouses earn income, strategize which deductions each person claims to minimize the couple’s total tax burden. For example, child allowances can be claimed by one spouse or split between both. Running the numbers both ways using a tax calculator can reveal meaningful savings.

Common Tax Filing Mistakes to Avoid

Year after year, the Revenue Department sees the same errors from taxpayers. Some of these mistakes cost you money; others can trigger penalties and audits. Here is what to watch out for.

1. Not Filing When You Are Required To

This is especially common among freelancers, gig workers, and people with side income. Many assume that if they owe no tax, they do not need to file. But if your income exceeds ฿60,000 (for non-salary income) or ฿120,000 (for salary), you must file regardless of whether tax is owed. Failure to file carries a fine of up to ฿2,000, and the Revenue Department can audit you for up to 5 years retroactively.

2. Not Claiming All Eligible Deductions

Many taxpayers file using only their personal allowance and Social Security contribution, leaving thousands of baht on the table. Common overlooked deductions include: home loan interest, life and health insurance premiums, parental care allowance, and charitable donations. Every unclaimed deduction means you are overpaying your taxes.

3. Missing the Filing Deadline

4. Confusing Gross Income with Net Income

Some taxpayers compare their total annual salary directly against the tax bracket table and panic at the seemingly high tax rate. Remember: the bracket table applies to net taxable income — your gross income minus expense deductions minus personal allowances. Your actual tax will be significantly lower than a naive reading of the brackets suggests.

5. Forgetting to Include All Income Sources

If you have income from multiple sources — salary plus rental income, stock dividends, freelance work, or online sales — you must aggregate all income when filing. Underreporting income can be treated as tax evasion, which carries civil penalties (surcharges + fines) and potentially criminal penalties.

6. Claiming Deductions You Are Not Entitled To

Examples include claiming a child allowance for children who have aged out, claiming a spouse allowance when your spouse has their own income, or deducting more than the allowed cap for a particular category. The Revenue Department runs automated cross-checks against employer records, fund providers, and insurance companies. Discrepancies will trigger a review, a demand for repayment, plus penalty surcharges.

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Effective tax planning starts with understanding the rules and claiming every deduction you deserve. Whether you are an employee, a freelancer, or a business owner, knowing the Thai tax system and planning ahead can legally reduce your tax bill by thousands — or even tens of thousands — of baht each year.

Use the Thailand Income Tax Calculator to compute your actual tax liability and see how much more you could save by adjusting your deductions.

References: Revenue Department of Thailand (กรมสรรพากร), Revenue Code Amendment Act, Notifications of the Director-General of the Revenue Department on Income Tax — Data as of tax year 2569 (2026)