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Finance

Sales Tax Calculator

Add a supplied tax rate to a price or extract tax from an inclusive total.

Amounts stay on this deviceMethod and assumptions below

Your financial inputs

Runs on your device

YOUR FINANCIAL SUMMARY

Your result

Let’s calculate.

Use the Calculate button to see your result.

Estimate based on your inputs and the stated assumptions.

How to use this tool

  1. Enter price or inclusive total, tax rate, mode.
  2. Select Calculate to view the result.
  3. Check the method and assumptions below before using the result.

The method, explained

Add tax: total = price × (1 + rate/100). Remove tax: pre-tax price = inclusive total ÷ (1 + rate/100).

A WORKED EXAMPLE

At 10%, a pre-tax price of 100 totals 110. Removing 10% tax from 110 recovers a pre-tax price of 100 and tax of 10.

What to keep in mind

The rate is supplied by you. This does not look up jurisdiction rules, exemptions, multiple tax layers or invoice-specific rounding.

Common questions

Why not subtract 10% from the inclusive total?

The tax percentage applies to the pre-tax base. Dividing by 1.10 reverses a 10% addition correctly.

Can this extract VAT mathematically?

Yes for one supplied percentage, but it does not determine legal VAT treatment or eligibility.

Methodology maintained by ClarityKit. How these tools are built and checked.