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Piauí ICMS Calculator

Working out ICMS in Piauí? The standard internal rate is 22.5%. Enter your amount below and get the net, tax and total in one click. The rate rose from 21% to 22.5% on 1 April 2025.

Piauí ICMS Calculator

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

Standard internal rate: 22.5% — The rate rose from 21% to 22.5% on 1 April 2025.

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 Piauí — 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
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Internal rate verified November 2026 · Source: Lei nº 8.558/2024 — Piauí

How to calculate Piauí 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 22.5% 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 Piauí split right matters

Whether you are a seller working out what to charge or a buyer checking a receipt, the split matters: net, tax, total. Get any one of them wrong and either you absorb the tax or your customer disputes the invoice. This calculator shows all three instantly, in Brazilian reais.

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Piauí ICMS FAQ

The standard internal rate is 22.5%. The rate rose from 21% to 22.5% on 1 April 2025.
Multiply the net price by the internal rate and add it on: a R$1,000.00 item at 22.5% gives R$225.00 of tax and a R$1,225.00 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 22.5%, a R$1,000.00 total divides to a R$816.33 net — the tax inside it is R$183.67. 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: Pernambuco · Rio de Janeiro.