Thailand Personal Income Tax Guide

IIT Rates (2026) — 8 Progressive Brackets

• 0% — on taxable income up to THB 150,000 (first bracket exempt)
• 5% — on income from THB 150,001 to THB 300,000
• 10% — on income from THB 300,001 to THB 500,000
• 15% — on income from THB 500,001 to THB 750,000
• 20% — on income from THB 750,001 to THB 1,000,000
• 25% — on income from THB 1,000,001 to THB 2,000,000
• 30% — on income from THB 2,000,001 to THB 5,000,000
• 35% — on income exceeding THB 5,000,000

Taxable income is calculated as assessable income less deductions and allowances. The rates apply to net taxable income after all reliefs.

Standard Deductions

• Personal allowance: THB 60,000 per taxpayer (standard deduction available to all resident individuals).
• Expense deduction (50%): For employment income (Category 1 and 2), a standard deduction of 50% of assessable income applies, capped at THB 100,000. For professional/independent income (Category 3), a similar 50% deduction applies with different caps based on income type.
• Spouse allowance: THB 60,000 for a legally registered spouse with no independent income (or limited income). An additional THB 60,000 is available if the spouse earns below the taxable threshold.
• Child allowance: THB 30,000 per child (for legitimate, adopted, or stepchildren under 25 studying at an educational institution). There is no limit on the number of children, but each child must meet eligibility criteria.
• Parental allowance: THB 30,000 per parent (up to 4 parents, including spouse's parents) for supporting parents aged 60 or older, provided the parent has income below THB 30,000 per year.
• Childcare and education: Actual education expenses for children (up to THB 2,000 per child) are deductible in addition to the child allowance.

Retirement Savings Deductions (LTF / RMF / SSF)

• RMF (Retirement Mutual Fund): Contributions are deductible up to 30% of assessable income, capped at THB 500,000 (combined with other retirement savings). The fund must be held until the contributor reaches age 55 (minimum 5-year holding period).
• LTF (Long-Term Equity Fund): As of 2026, the LTF programme was restructured — new contributions may have different limits. Existing LTF holdings continue under previous rules (maximum 30% of income, capped at THB 500,000, with a 7-year holding period, now phased out for new investments from 2020 onward).
• SSF (Super Savings Fund): Introduced as a replacement for LTF, contributions are deductible up to 30% of assessable income, capped at THB 200,000 (subject to annual limits). The holding period is 10 years.
• Provident fund / Government pension fund: Employer and employee contributions are deductible (employee portion up to 15% of salary or THB 500,000 per year, whichever is lower).
• Combined cap: Total retirement savings deductions (RMF + SSF + provident fund + NPF/govt fund) cannot exceed THB 500,000 per year.

Other Reliefs and Credits

• Life insurance premiums: Deductible up to THB 100,000 for policies with a term of 10+ years from a licensed Thai insurer.
• Health insurance premiums: Deductible up to THB 25,000 (additional to life insurance).
• Mortgage interest: Deductible up to THB 100,000 for interest on a home loan for the taxpayer's primary residence.
• Donations: Donations to approved charitable organisations are deductible at up to 10% of net income (before the donation). Donations to certain educational and public-benefit organisations qualify at 2x the donation amount.
• Social Security contributions: Employee contributions to the Social Security Fund are deductible up to THB 6,000 per year (5% of wages).
• Easy E-Receipt: A limited-time measure (often renewed) allowing a deduction for e-receipt purchases from registered vendors, capped at THB 30,000–50,000 (check current year rules).

Filing and Payment

• Tax year: Calendar year (1 January – 31 December).
• Filing deadline: 31 March of the following year (paper filing). E-filing deadline extends to 31 August (automatic extension for online filers).
• Withholding (WHT): Most employment income is subject to monthly withholding by employers (50% of tax due approximated). Investment income (dividends, interest) has withholding at source — see Investment Income Guide.
• Payments: Tax due with the return. Instalment options may be available for large tax bills. Late payment attracts a penalty of 1.5% per month (or fraction thereof).
• Penalties: Late filing — 2x the tax due (reducible to 1x if paid before notice). Late payment — 1.5% per month on the outstanding amount.