Simples Nacional Tax Calculator Brazil

See your effective tax rate and monthly DAS under Simples Nacional Anexo I.

RBT12 (revenue, last 12 months)R$Current month's revenueR$

—estimated monthly DAS

—effective rate

—nominal bracket rate

Estimates only — not tax advice. Based on 2026 Simples Nacional Anexo I (commerce) brackets. Source: Receita Federal.

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About the Simples Nacional Tax Calculator

Simples Nacional is Brazil's simplified tax regime for small businesses, unifying several federal, state and municipal taxes into one monthly payment (DAS). Your rate isn't flat — it's calculated from your RBT12 (gross revenue over the trailing 12 months) using a progressive formula, then applied to your current month's revenue. This calculator uses Anexo I, the table for commerce activities.

How it works

Find your nominal bracket from RBT12 (revenue over the last 12 months).
Calculate your effective rate: (RBT12 × nominal rate − deduction) ÷ RBT12.
Apply that effective rate to your current month's revenue to get your DAS payment: DAS = monthly revenue × effective rate.

Assumptions and behaviour

Uses the 2026 Anexo I (commerce) bracket table — six income brackets from 4% up to 19%, each with its own deduction amount.
Assumes your business is exclusively commerce activity under Anexo I — service businesses use different annexes (III, IV or V) with different rates.
The deduction built into each bracket is what makes the tax progressive rather than a single flat rate on your whole RBT12.

Limitations

Only covers Anexo I (commerce) — service-based businesses need a different annex.
Doesn't check whether you're within the Simples Nacional revenue ceiling (R$4.8 million/year).
Estimates only — not tax advice. Confirm with your accountant or the Receita Federal portal.

Privacy

The calculation runs entirely in your browser. Nothing is uploaded or stored.

Frequently asked questions

Is this Simples Nacional calculator free?

Yes — free, no sign-up, no limits, runs in your browser.

What's RBT12?

Receita Bruta dos últimos 12 meses — your business's total gross revenue over the trailing 12 months, which determines your tax bracket.

Why isn't my rate just the nominal bracket rate?

Simples Nacional uses a deduction-adjusted formula so the tax is genuinely progressive — your effective rate is always a bit below the nominal rate for your bracket, except in the lowest bracket where the deduction is zero.

Does this cover services businesses?

No — this uses Anexo I (commerce only). Service businesses fall under Anexo III, IV or V, which have different rates.

Is my data uploaded?

No. Everything runs locally in your browser; nothing is sent or stored.

Written by Lakshay Kumar(TechLakshay)

A QA Automation Engineer by trade, Lakshay's real passion is untangling complex problems into simple, working solutions — which is exactly why FreeMyTask exists. On Instagram, he channels that same instinct into helping 26,000+ content creators with SEO education, motivation, and hands-on query solving.

Last updated: August 22, 2026