Thailand SSO Contribution Calculator

Work out your Thai Social Security (SSO) contribution. From 1 January 2026 the wage ceiling rose to ฿17,500 a month — the first change in 30 years — so the most an employee pays is now ฿875 a month, not ฿750. Pick your section, enter your wage, and see the employee, employer and government shares. Everything runs in your browser; nothing is uploaded.

Contributions apply between the ฿1,650 wage floor and the ceiling above. Wages above the ceiling are charged on the ceiling only.

Your Share (per month)
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Employer Share (per month)
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Total (per month)
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How to Use

  1. Pick your SSO section — Section 33 if you work for a company, Section 39 if you left a job and keep paying voluntarily, Section 40 if you are an informal worker.
  2. For Section 33, enter your monthly wage and the ceiling period — 2026 uses the new ฿17,500 ceiling.
  3. Press Calculate — you get your share, your employer's share, the government top-up and the yearly total.

Current SSO Rates Used

Section 33: employee 5% + employer 5% + government 2.75%, on wages between the ฿1,650 floor and the ceiling. Ceiling phases: ฿17,500 (2026–2028, max ฿875 each side), ฿20,000 (2029–2031, max ฿1,000), ฿23,000 (2032 onwards, max ฿1,150). Section 39: flat ฿432 a month (9% of a fixed ฿4,800 base, unchanged by the 2026 reform). Section 40: flat ฿70 / ฿100 / ฿300 a month by option.

Frequently Asked Questions

Why is my SSO deduction ฿875 and not ฿750?

The wage ceiling was frozen at ฿15,000 for 30 years (1995–2025). From 1 January 2026 it rose to ฿17,500, so 5% of the ceiling is ฿875. Many old guides and payslip tools still show the old ฿750 figure.

I earn more than the ceiling. Do I pay 5% of my full salary?

No. Contributions are charged only on the part of your wage up to the ceiling. On a ฿30,000 wage in 2026 you pay 5% of ฿17,500 — that is ฿875, an effective rate of about 2.9% of your wage.

What is the difference between Section 33, 39 and 40?

Section 33 covers company employees (employer + employee + government all pay). Section 39 is for people who left a company job and choose to keep contributing voluntarily at a flat ฿432. Section 40 is for informal workers — freelancers, vendors, farmers — who pick a flat monthly option.

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Disclaimer: This is an estimate based on the Social Security Office rates and the phased ceiling schedule published in the Royal Gazette on 12 December 2025 (฿17,500 from 1 January 2026, ฿20,000 from 2029, ฿23,000 from 2032). A temporary relief rate of 3% applied in nine flood-hit southern provinces from December 2025 to May 2026 — this calculator uses the standard 5% rate. Always check your payslip and the Social Security Office before relying on a figure. This tool is not affiliated with the SSO and is not financial advice.