Calculation Methodology & Official Sources
In 2026, Spanish Social Security compares the traditional method —the contribution bases from the previous 300 months divided by 350— with the 2026 transitional method —the 302 highest contribution bases within the previous 304 months divided by 352.33— and applies the more favorable result.
⚠️ Note: This is a simplified estimate assuming a constant monthly contribution base. The actual monthly bases for the previous 304 months would be required to apply the 2026 transitional method precisely. It does not replace the official personalized calculation from the Social Security portal.