Adding and removing sales tax
Understand the difference between tax-exclusive and tax-inclusive amounts.
Start with the taxable base
To add a single combined rate, multiply the net amount by one plus the rate divided by 100. At 5%, a net 100 becomes 105. To remove included tax, divide the gross amount by that same factor. Subtracting 5% directly from 105 would be incorrect because that percentage is being applied to the wrong base.
Regional rules still matter
The Canadian tool includes general GST/HST and provincial rates for ordinary taxable goods. It does not determine place of supply, product exemptions, rebates or special-sector rules. The US tool requires your combined local rate; it does not look up a ZIP code. The VAT tool also uses your entered rate. Confirm the correct rate and taxable basis before using a result for an invoice or filing.
Compare like with like
Currency selection labels the result but does not convert it. Keep the currency of your input throughout the calculation. Displayed totals are rounded; accounting systems may round at line-item or invoice level differently. The listed content date records the last review, not a promise that every rule remains unchanged.
Content updated: 2026-10-10