Finance
Sales Tax Calculator
Compute sales tax and total price from a pre-tax amount.
Free to use — no sign-up or login.
Sales tax
Total
Amortization schedule
| # | Date | Payment | Principal | Extra | Interest | Balance |
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At many U.S. registers the shelf price is still net of sales tax. This calculator takes that pre-tax amount and a tax rate in percent, multiplies to get the tax dollars, then adds tax to price for the checkout total. Enter the rate your jurisdiction publishes for the item — the tool does not look up local rates.
Tips and discounts are different jobs: a tip is a gratuity on the bill you choose, and a discount usually cuts the pre-tax price before tax applies. For those, use the Tip Calculator or Discount Calculator. The longer add-tax and extract-from-gross walkthrough is How to Calculate Sales Tax and VAT.
Pre-tax price and rate are the only inputs
Price before tax is the net amount the rate applies to. Tax rate is percentage points (8.25 means 8.25%, not 0.0825). The outputs are sales tax in the same currency units as the price, and total as price plus tax. Combined city and state rates belong in a single rate field if that is how you are quoting the purchase.
What this page does not decide
Taxability, exemptions, shipping treatment, and register rounding rules vary by place and product. A VAT-inclusive sticker price is a different starting point: you would divide the gross by (1 + r/100) to recover the net, which this form does not do — it only adds tax onto a pre-tax price. For the reverse arithmetic and VAT language, see the sales-tax tutorial linked above.
Worked example: $49.99 at 8.25%
Match the calculator defaults: price before tax $49.99 and tax rate 8.25%. Tax = 49.99 × (8.25 / 100) = 49.99 × 0.0825 = $4.124175, which displays as about $4.12 when rounded to the cent. Total = 49.99 + 4.124175 = $54.114175 ≈ $54.11. A cleaner mental check uses $40 at the same rate: tax = $3.30 and total = $43.30 exactly.
\[ T=49.99\times 0.0825=4.124175,\quad G=54.114175 \]
Frequently asked questions
Is the price field before tax or after tax?
Before tax. The label is “Price before tax.” If your sticker already includes tax, do not enter that gross amount here — the result would overstate tax.
Can I enter 0.0825 instead of 8.25 for the rate?
No. The rate field expects percentage points, so ordinary 8.25% sales tax is entered as 8.25. Entering 0.0825 would be treated as a 0.0825% rate.
Does this remove tax from a tax-included total?
Not in this form. To recover a pre-tax amount from a gross total G at rate r%, compute G / (1 + r/100). The tutorial shows that inverse; this calculator only adds tax to a net price.
Should I tax the tip or the discounted price?
Local rules differ. Commonly, tax applies to the taxable merchandise total after discounts and before tip. Enter whatever pre-tax taxable amount your receipt uses; this tool will not stack tip or coupon logic for you.
Assumptions and limitations
Finance results are illustrative. They typically omit taxes, fees, prepayment penalties, and product rules, and they are not investment or lending advice.
This calculator adds a single percentage to a pre-tax price. It does not look up jurisdiction rates, decide what is taxable, apply exemptions, or extract tax from a tax-inclusive sticker. It is not tax advice.