Tax Calculator
Calculate tax amount and total with tax
Enter Details
Results
Amount Before Tax
$100.00
Tax Amount
$8.50
Total with Tax
$108.50
Tax Tips
Toggle "includes tax" when working backwards from a total to find the pre-tax amount
Quick Facts
US sales tax rates vary by state from 0% to over 10% including local taxes
Note
This calculator works for sales tax, VAT, GST, and other percentage-based taxes
How this tax calculator works
Calculate tax on any amount or work backwards from a total that includes tax to find the pre-tax amount. Useful for sales tax, VAT, GST, or any percentage-based tax.
- Forward: Tax = amount × rate, Total = amount + tax
- Reverse: Pre-tax = total ÷ (1 + rate), Tax = total - pre-tax
- Works for any percentage-based tax
Last updated: February 2026
Tax calculator FAQ
What's the difference between with/without tax included?
Without = calculate tax on a pre-tax amount. With = extract the tax from a total that already includes it.
Can I use this for income tax?
This works for simple percentage taxes. Income tax often uses brackets, which need a more complex calculator.
What tax rate should I use?
Check your local sales tax rate. In the US, combine state and local rates for the total percentage.
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