Credits

Calcula Já is built on public data and open-source software. This page gives each of them due credit.

Official sources

• INSS (Brazil's social security institute) — monthly contribution table for employees and MEIs: gov.br/inss.
• Receita Federal (federal tax authority) — 2026 income tax tables and worked examples of Lei 15.270/2025: gov.br/receitafederal.
• Planalto (the Brazilian Presidency's legislation portal) — texts of the CLT, the Constitution and the laws cited in the calculators: planalto.gov.br.

The full list of parameters, with effective dates and a link to each source, is under methodology and sources.

IP geolocation

The language suggestion uses the IP to Country Lite database by DB-IP, licensed under Creative Commons Attribution 4.0 (CC BY 4.0). IP Geolocation by DB-IP. The lookup runs on our server and the IP is not recorded; see the privacy policy.

Open-source software

• Astro — the framework that builds the site's pages. MIT licence.
• mmdb-lib — reads the IP-to-country database. MIT licence.
• uqr — generates QR codes in the browser. MIT licence.

Trademarks

“QR Code” is a registered trademark of DENSO WAVE INCORPORATED. WhatsApp is a trademark of WhatsApp LLC; this site is not affiliated with WhatsApp or Meta.