Institute for Tax.
Tools / Calculators

Social Security Totalization Check

Check if you can avoid double social security taxation based on existing treaties.

Totalization Agreement Matrix

Select two different countries.
Yes, a Totalization Agreement exists between these jurisdictions. You generally will not pay dual social security taxes and can combine credits.
No Totalization Agreement exists. You may be subject to double taxation on self-employment or payroll taxes depending on domestic laws.

Assumptions & Methodology

This tool provides estimates based on standard statutory rates and common exemptions. It does not constitute formal tax advice. Variables such as local municipal taxes, complex double-taxation treaty tie-breaker rules, and specific entity structuring are simplified for modeling purposes.