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Social Security Registration
Employer and employee obligations under the Social Security Act B.E. 2533 (1990) — Sections 33, 39 and 40 — including registration timeline, contribution rates, and the THB 15,000 contribution-base cap.
Overview
Thailand's Social Security System is established by the Social Security Act B.E. 2533 (1990) — พระราชบัญญัติประกันสังคม พ.ศ. 2533 — administered by the Social Security Office (SSO / สำนักงานประกันสังคม) under the Ministry of Labour (กระทรวงแรงงาน). Every employer with one or more employees must register the business and each employee with the SSO within 30 days of the first employee's start date. The Act recognises three contributor categories: Section 33 (formally employed), Section 39 (former Section-33 insureds who continue voluntarily after leaving employment), and Section 40 (self-employed and informal workers). Employer and employee each contribute a percentage of monthly wage to the Social Security Fund, capped at a THB 15,000 contribution base per month at current rates.
Key Points:
- Legal basis: Social Security Act B.E. 2533 (1990) — พระราชบัญญัติประกันสังคม พ.ศ. 2533
- Employer registration with the Social Security Office within 30 days of first employee's start date
- Section 33 (employed): employer 5% + employee 5% of monthly wage; contribution base capped at THB 15,000/month — i.e., maximum contribution THB 750 each per month
- Section 39 (voluntary continuation): former Section-33 insureds who pay both halves (currently THB 432 per month on a fixed base of THB 4,800) to keep benefits
- Section 40 (self-employed / informal): three contribution plans (THB 70, 100, 300 per month) with corresponding benefit packages
- Covered benefits: sickness, maternity, disability, death, child allowance, old-age pension, unemployment (Section 33 only)
- Penalty for late registration / contribution: surcharge of 2% per month plus fine up to THB 20,000 and imprisonment up to 6 months for serious violations
Section 33: Employed Persons
Section 33 of the Social Security Act B.E. 2533 (1990) covers all employees of registered businesses, regardless of nationality.
- Coverage: all employees aged 15 to 60, including foreigners with valid work permits
- Contribution: 5% employer + 5% employee on monthly wage capped at THB 15,000 — i.e., maximum THB 750 each per month
- Employer must withhold employee share and remit total within 15 days of the following month using form SPS 1-10
- Late payment: 2% per month surcharge plus enforcement action
- Benefits: medical care (free at registered hospital), maternity (lump sum + paid leave top-up), child allowance (currently THB 800 per child up to age 6), sickness leave (50% of wage up to 90 days), disability, death (funeral grant + survivors' pension), unemployment (up to 6 months), old-age (pension or lump sum from age 55)
Section 39: Voluntary Continuation
Section 39 allows former Section-33 insureds to continue their social-security coverage after leaving formal employment.
- Eligibility: contributed under Section 33 for at least 12 months and apply within 6 months of leaving employment
- Contribution: THB 432 per month (9% of a fixed base of THB 4,800), entirely paid by the insured
- Benefits: same as Section 33 except no unemployment benefit
- Lapse: missed 3 consecutive months or 9 months in 12 — coverage terminates
Section 40: Self-Employed and Informal Workers
Section 40 extends social-security coverage to the self-employed, freelancers, and informal-sector workers who have never been Section-33 insured (or no longer qualify for Section 39).
- Eligibility: Thai nationals aged 15-65 working independently
- Three plans: Plan 1 (THB 70/month — sickness, disability, death), Plan 2 (THB 100/month — adds old-age lump sum), Plan 3 (THB 300/month — adds child allowance and richer old-age benefit)
- Government co-contribution: the state tops up Section 40 contributions for certain plans
- Benefits are narrower than Section 33 but the structure provides a basic safety net for the informal economy
Relevance for Foreign Nationals
Foreign employees working legally in Thailand are covered under Section 33 just like Thai employees. Foreign business owners often misunderstand the THB 15,000 contribution-base cap — high salaries are still capped, but the obligation is mandatory. Failure to register an employee or pay contributions exposes directors to personal criminal liability under the Social Security Act, in addition to the company-level surcharge. Set up SSO registration as a Day-1 task alongside Revenue Department registration.
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