Thai social-security wage base versus salary
Why Section 33 contributions apply dated minimum and maximum wage bases.
The base may differ from salary
The calculation constrains wages between the minimum and ceiling for the effective period, so it may not multiply the full salary.
Effective dates matter
A ministerial regulation can change the ceiling. The tool selects supported dated data and discloses the period; match it to the payroll period.
Check payroll facts
Insured status, missed periods, retroactive adjustments and employer payroll handling remain outside the basic formula.
Sources and scope
This guide explains how to prepare inputs within the tool's scope. It is not legal, tax, financial or academic advice.
Content and sources checked 18 September 2026