Work out your Brazilian 13th salary (décimo terceiro), split into the 1st and 2nd installment with INSS and IRRF withheld on the 2nd - locally, no upload.
Updated for tax year 2026
No. Everything runs in your browser - your file never leaves your device. How this is verifiable
The 13th salary (décimo terceiro salário) is a mandatory Brazilian year-end payment of one extra month's salary per year, prorated for each full month worked (at least 15 days worked counts as a full month). It is paid in two installments: the 1st between February and November with no deductions at all, the 2nd by December 20 with INSS and IRRF withheld on the full amount.
The calculation runs entirely locally in your browser, in pure JavaScript - nothing is uploaded or stored. The INSS contribution and the IRRF wage tax are calculated on the full 13th salary (the same bracket tables as the regular salary) and withheld ONLY from the 2nd installment - the 1st installment stays untouched, exactly as in a real payroll run.
An honest note: this is a model-based estimate, not an official pay stub. The 2026 IRRF relief is calculated using the real formula from Lei nº 15.270/2025, same as the net-salary calculator, not an approximation. The calculator assumes a single calendar year with the entered months worked - a mid-year salary change is not modeled.
| Input formats | Form inputs (no file) |
|---|---|
| Processing | Locally in your browser (JavaScript) |
| File upload | None |
Limitations: A model-based estimate, not an official pay stub. The 2026 IRRF relief follows the real formula from Lei nº 15.270/2025. Assumes a single calendar year - a mid-year salary change is not accounted for. Check the current INSS/IRRF tables yourself.
No, the entire calculation runs locally in your browser - nothing is uploaded or stored.
Brazilian law calculates INSS and IRRF on the full 13th salary and withholds both entirely from the 2nd installment.
The 13th salary is reduced proportionally - each full month (from 15 days worked) counts 1/12 of the monthly salary.
Yes, each dependent lowers the IRRF taxable base by a fixed statutory allowance.
Yes, the same progressive bracket table applies - only the base is the full 13th salary instead of the monthly salary.
Brazil Net Salary · Brazil Termination Settlement · Brazil Vacation Pay · Lunar Calendar and Zodiac · Rent vs Buy Calculator · Aguinaldo Calculator (Mexico) · Monthly ISR Calculator · Gross to Net Salary NL · NPV Calculator · Ovulation Calculator