Sales Tax Calculator
Add sales tax to any amount and see the total. It also works in reverse — the pre-tax line shows what the amount would be if it already included tax.
Pre-tax + tax
🧮 Automate sales tax for your store
Check it outForward and reverse
Enter a pre-tax price and the top line shows the total you'll pay. If instead you have a tax-inclusive total and want the price before tax, read the bottom line — it divides the amount by one plus the rate. Combined rates often stack state, county, and city taxes, so confirm your local rate.
How it’s calculated
Tax = amount × rate; total = amount + tax. Pre-tax from a total = total ÷ (1 + rate).
Results update as you type and are estimates, not professional advice — verify important decisions with a qualified professional.
Worked example
$100 at an 8.25% rate adds $8.25 tax for a $108.25 total; from a $108.25 total, the pre-tax price is $100.
Common mistakes
- Using the state base rate and forgetting local taxes.
- Applying the rate to a tax-included total.
Where it is used
- Adding tax to a quote or invoice.
- Backing out the pre-tax price from a receipt.
Frequently asked questions
Can it remove tax from a total?
Yes — the 'pre-tax' line treats your amount as a tax-included total and shows the price before tax.
Where do I find my rate?
Your state revenue department lists combined rates by address; receipts also show the combined rate you paid.
Is sales tax the same everywhere?
No. Rates vary by state and locality, and a few states have no sales tax at all.
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