Business calculator
Sales Tax Calculator
Add or remove sales tax from a price and see tax amount and total clearly.
Formula
Sales tax formula
Sales tax varies by location, item type, exemptions, and filing rules.
Tax = price x tax rate / 100; total = price + tax
At 8% tax, a 100 price has 8 tax and a total of 108.
Sources and assumptions
Sales tax source notes
This profile covers generic sales tax add/remove calculations. The calculator applies the rate entered by the user and does not determine nexus, local surtaxes, exemptions, or item-specific rules.
- Effective year
- 2026
- Last verified
- 2026-05-27
Sales tax varies by location, item type, exemptions, and filing rules.
Official and reference sources
Assumptions
- The user enters the full tax rate that applies to the transaction.
- The full price is taxable at a single rate.
- Inclusive price mode backs tax out using price / (1 + rate / 100).
Not included
- US city, county, special district, marketplace, nexus, and product-specific rate lookup.
- Exemptions, holidays, resale certificates, shipping taxability, and filing rules.
- Canadian provincial rules beyond the manually entered rate.
FAQs
Can this remove tax from an inclusive price?+
Yes. It also estimates the pre-tax price from a tax-inclusive amount.
Which tax rate should I use?+
Use the rate for the buyer's jurisdiction and item category.
How does the Sales Tax Calculator calculate the result?+
It uses the Sales tax formula: Tax = price x tax rate / 100; total = price + tax. At 8% tax, a 100 price has 8 tax and a total of 108.
What information do I need to use the Sales Tax Calculator?+
Add or remove sales tax from a price and see tax amount and total clearly.
How accurate is the Sales Tax Calculator?+
Sales Tax Calculator applies the formula and assumptions shown on this page. Results may be rounded for readability, so verify changing rates, thresholds, medical guidance, or legal rules with the cited source or a qualified professional.
What should I check before using the Sales Tax Calculator result?+
Check that the units, dates, rates, and assumptions match your situation. Change one input at a time to understand which values have the largest effect on the result.
Business guide
How to use the Sales Tax Calculator
Add or remove sales tax from a price and see tax amount and total clearly. The page also explains the sales tax formula and shows a practical example: At 8% tax, a 100 price has 8 tax and a total of 108.
- 1
Enter your details
Enter a price and see tax amount and total clearly, then complete any other fields shown in the calculator.
- 2
Check the calculation
Review the result alongside the sales tax formula: Tax = price x tax rate / 100; total = price + tax.
- 3
Compare scenarios
Change one or more inputs to see how they affect the sales Tax Calculator result before you use the estimate.
Was this calculator useful?
0/1200