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Sales tax calculator

Add a supplied tax rate or extract tax from an inclusive amount, with an exact breakdown.

Tax breakdown
Before taxUSD 100.00
Tax · 8.25%USD 8.25
TotalUSD 108.25
Net amountUSD 100.00Tax amountUSD 8.25

Tax = net × rate, rounded to cents. Total = net + tax.

Two decimal places; no conversion.
Your supplied rate, from 0% to 100%.

Net + tax always equals the shown total. This is a single-rate estimate.

Processed on your device

How it works & useful details

Formula & assumptions

Add-tax mode calculates tax = net × supplied rate and rounds to cents. Inclusive mode calculates net = total ÷ (1 + rate), rounds net, and uses total − net as tax. One flat rate from 0–100% applies to the entire amount. Tax rates, exemptions, cascading taxes and regional rounding rules are not looked up.

Local planning workspace

These tools are planning aids, not financial, tax or legal advice. Values stay in this page. Nothing is sent, saved to your records or fetched from external services.

USD, EUR, GBP, CAD and AUD are labels with two decimal places. There is no currency conversion. Enter decimals with a dot and no commas. Money inputs are limited to 1 billion units; calculated amounts to 10 trillion. Rates are supplied by you, with up to four decimal places.