A Brazilian CLT payslip runs through two calculations in sequence. INSS is a progressive employee contribution (7.5% to 14% across four bands) applied to your salário de contribuição, capped at a teto of R$8,475.55/month for 2026, so the maximum possible INSS deduction is about R$988.09 regardless of how high your salary climbs above that ceiling.
IRRF then applies to your base de cálculo, gross salary minus INSS, using the standard progressive table (0% up to R$2,428.80, rising to 27.5% above R$4,664.68). New for 2026: Lei 15.270/2025 adds a redutor applied after that table calculation, based on your gross monthly salary rather than the post-INSS base, that fully zeroes IRRF up to R$5,000/month and shrinks it gradually through R$7,350.
What this calculator deliberately leaves out is 13º salário (calculated and taxed separately with its own rules), FGTS (an 8% employer-side contribution that doesn't reduce your take-home), and dependents (which would increase your IRRF deduction).