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Maranhão ICMS Calculator

Working out ICMS in Maranhão? The standard internal rate is 23%. Enter your amount below and get the net, tax and total in one click. The rate rose from 22% to 23% on 23 February 2025 — the highest general ICMS rate in Brazil.

Maranhão ICMS Calculator

Results update live as you type. Amounts in BRL. Nothing leaves your browser.

Standard internal rate: 23% — The rate rose from 22% to 23% on 23 February 2025 — the highest general ICMS rate in Brazil.

Your Numbers
“Add tax” starts from a net price. “Remove tax” works backwards from a total that already includes tax. This is the STANDARD INTERNAL rate in Maranhão — This is the state's standard internal rate for most goods and services. Reduced tax bases, exemptions and tax substitution (ICMS-ST) can change the effective tax on specific items, and sales to buyers in other states generally use the interstate rates of 7% or 12% instead — this calculator does not cover those cases. If a different rate applies to your item, type it into the rate field. If you know a different rate applies to your item, type it into the rate field.
Your result
0.00
total including tax
Net amount (before tax)0.00
Tax amount0.00
Gross amount (with tax)0.00
Add this to a free invoice →

Internal rate verified November 2026 · Source: Lei nº 12.426/2024, art. 3º — Maranhão

How to calculate Maranhão ICMS in 3 steps

  1. Enter your amount. Type the price you are working with — either before tax or tax-inclusive, depending on what you have.
  2. Pick the rate and direction. The 23% standard internal rate is pre-filled and editable; choose “Add tax” or “Remove tax”.
  3. Read the split instantly. You get the net amount, the exact tax, and the gross total — ready to quote, invoice, or check a receipt against.

Why getting the Maranhão split right matters

Getting the tax split wrong is how invoices turn into arguments: the net, the tax and the total must all be visible and correct. This calculator shows all three instantly, both ways — adding tax to a net price and extracting it from a gross total. When the numbers are right, drop them straight into the free invoice generator.

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Maranhão ICMS FAQ

The standard internal rate is 23%. The rate rose from 22% to 23% on 23 February 2025 — the highest general ICMS rate in Brazil.
Multiply the net price by the internal rate and add it on: a R$1,000.00 item at 23% gives R$230.00 of tax and a R$1,230.00 total. In the calculator, choose “Add tax”, enter the amount and rate, and the split appears instantly.
Divide the gross total by (1 + rate ÷ 100). At 23%, a R$1,000.00 total divides to a R$813.01 net — the tax inside it is R$186.99. Choose “Remove tax” in the calculator and it does this for you.
No. This is the state's standard internal rate for most goods and services. Reduced tax bases, exemptions and tax substitution (ICMS-ST) can change the effective tax on specific items, and sales to buyers in other states generally use the interstate rates of 7% or 12% instead — this calculator does not cover those cases. If a different rate applies to your item, type it into the rate field.
Sales to buyers in other states generally use the interstate rates of 7% or 12%, not the internal rate, and tax substitution (ICMS-ST) may also apply. This calculator starts from the internal rate; type 7% or 12% into the rate field if you are pricing an interstate sale.
Yes — unlimited calculations, no signup, no watermark. Everything runs in your browser; nothing you type is uploaded anywhere.

Related calculators

See all Brazilian states, try the tax calculator for any rate, or put the result on a free invoice. More state calculators: Goiás · Mato Grosso.