A sales tax calculator adds tax to a pre-tax price or removes it from a tax-included total. The first shows what a shelf price costs you at checkout. The second shows the tax inside your receipt. The tool uses the rate and price you enter; it does not look up local rates or decide taxability.
How to Use the Sales Tax Calculator
- Pick the Price Mode: Choose "Add Tax" when the shelf price excludes sales tax and you want the checkout total. Choose "Tax Included" when the sticker price already contains tax and you want the tax inside it extracted.
- Enter the price: Type the amount in the "Pre-Tax Price" field, which becomes "Tax-Included Price" when the Tax Included mode is selected.
- Enter the rate: Type the "Sales Tax Rate (%)", the state plus local combined rate rather than the state rate alone.
- Add a discount: Optionally enter a "Discount (%)" to reduce the taxable base before the rate is applied.
- Calculate: Press Calculate to see the "Total Price" (or "Sales Tax in Price" in Tax Included mode), along with the "Taxable Amount", "Sales Tax", and the line-by-line summary.
Enter the combined rate from a past receipt or your state revenue department; rates and taxability vary by state, county, city, and product.
The Structure of US Sales Tax: Layered Jurisdictions
State Baseline Tax + County Surcharges + Municipal Taxes
The United States has no single national sales tax. A state sets a baseline, and counties, cities, and special districts add layers. Forty-five states levy a statewide sales tax, and the population-weighted average of combined state and local rates was 7.53% as of January 1, 2026, according to the Tax Foundation's state and local sales tax data. The combined rate is the sum that applies to the sale; two addresses in one state can differ.
From the same source, for orientation: five states levy no general statewide sales tax (Alaska, Delaware, Montana, New Hampshire, and Oregon), with Alaska the only one of the five that allows local sales taxes and Montana's resort-area taxes tracked separately. Read those five alongside the 7.53% average above as a sense of scale only; the figures move and local taxes still apply at some addresses, so verify both against the current source page and the address you are buying at.
As a mock receipt on a $100.00 sale where the layers stack, with each line computed on the same taxable base:
| Receipt line | Rate | Tax on $100.00 |
|---|---|---|
| State | 6.00% | $6.00 |
| County | 1.25% | $1.25 |
| City | 1.00% | $1.00 |
| Combined | 8.25% | $8.25 |
| Total price with tax | $108.25 |
Enter your combined figure. Using only the state rate understates your tax, and averaging local rates may match no address.
How to Find Your Combined Rate
- A past receipt: the tax line on a receipt from the same address shows the combined rate that seller collected.
- The seller: for an upcoming purchase, ask what rate they charge on delivery to your address, since most remote sellers apply destination-based rates.
- Your state revenue department: most publish a tax-rate lookup by address that returns the state, county, city, and district amounts to add together.
Special Taxing Districts (Transit, Stadium, and Tourism Levies)
Special districts add fractions of a percent for transit, stadiums, tourism, or other projects. A levy may apply only in a defined area or to certain goods. A hotel can face a different mix than a grocery store in the same city. Add district levies before entering the rate; one rate cannot represent a mixed basket.
Forward Calculation: Adding Sales Tax to a Purchase
The Standard Equation: Total = Pre-Tax Price × (1 + Combined Tax Rate)
To add tax, convert your rate to a decimal and multiply your pre-tax price by one plus that decimal. At 8.25%, the multiplier is 1.0825. The tax is price times 0.0825. The calculator assumes a percentage discount reduces the taxable base first. Actual treatment of coupons or other discounts can vary by jurisdiction and seller, so use the taxable amount shown on the receipt when available.
Step-by-Step Calculation Example on a $150 Purchase
Take $150.00 at 8.25%. Tax is $150.00 times 0.0825, or $12.38 after rounding. The total is $162.38. With a 10% discount, the discount is $15.00, taxable amount $135.00, tax $11.14, and total $146.14. The effective tax on the original price falls with the discount: the $11.14 of tax on the $150.00 original price is an effective 7.43% (7.425% before rounding), against 8.25% with no discount, and the difference is the discount rate times the tax rate.
| Step | Amount |
|---|---|
| Pre-tax price | $150.00 |
| Combined tax rate | 8.25% |
| Sales tax | $12.38 |
| Total price | $162.38 |
Reverse Calculation: Backing Out Sales Tax from a Total
Finding the Pre-Tax Price: Pre-Tax Amount = Total Price ÷ (1 + Tax Rate)
To reverse a tax-included total, divide by one plus the rate as a decimal. A $162.38 total at 8.25% becomes $162.38 divided by 1.0825, or $150.00 after rounding. Tax is the total minus the net, or $12.38. Do not subtract 8.25% from the total; that uses the wrong base and understates the net price.
Business Expense Auditing: Extracting Paid Taxes for Accounting
Businesses often need the tax portion of a receipt for bookkeeping. If the receipt shows one combined rate, enter the total in Tax Included mode and read the tax and net. If it lists several rates or mixed items, split it into lines and calculate each rate. Worked through on a two-line receipt: an $80.00 item taxed at 7% carries $5.60 of tax, a $20.00 item taxed at 3% carries $0.60, so the receipt shows $6.20 of tax on $100.00 of goods and a $106.20 total. No single rate entered into this tool reproduces that receipt, because one line is taxed at 7% and the other at 3%. Keep the receipt and rate source; a calculated split is not a replacement. The tool does not classify purchases as deductible or exempt.
Tax-Exempt Goods and State Variations
Grocery Food Exemption Policies Across US States
Sales-tax treatment of groceries varies by state and locality. Rules may distinguish qualifying food from prepared meals, candy, soft drinks, or other products, and local taxes can differ from state treatment. A receipt can mix taxable and exempt lines. Apply the rate only to the taxable subtotal, or use the receipt's tax line.
Prescription Medications and Clothing Exemptions
Tax treatment can also differ for prescription and over-the-counter medicines, clothing, and shipping. Some jurisdictions set product-specific exemptions or thresholds. Check the relevant state revenue department or receipt; this calculator estimates tax on a known taxable amount and does not decide whether an item is taxable.
For household planning, pair this result with the Property Tax Calculator, include vehicle purchases via the Auto Loan Calculator, and convert the after-tax cost into working hours with the Hourly to Salary Calculator.
State Sales Tax Rates: Context for the Rate You Enter
The calculator asks you to enter a combined rate because rates vary by state, county, and city. The table below provides orientation — not the rate you should enter. Always confirm the combined state-plus-local rate for your specific location before using it, because a city surcharge, county add-on, or special district levy can raise the effective rate several points above the state base. Figures below are approximate 2024 averages from Tax Foundation data and are rounded; they change when legislatures act.
| State | State rate | Avg. local add-on | Avg. combined rate | Notes |
|---|---|---|---|---|
| Louisiana | 4.45% | ~5.1% | ~9.55% | Some of the highest local rates in the country |
| Tennessee | 7.00% | ~2.5% | ~9.55% | Groceries taxed at reduced rate (4%) |
| Arkansas | 6.50% | ~3.0% | ~9.46% | Food taxed at reduced rate (0.125%) |
| Washington | 6.50% | ~2.7% | ~9.21% | No state income tax; sales tax is major revenue |
| Alabama | 4.00% | ~5.1% | ~9.24% | Local rates vary widely; groceries taxable |
| California | 7.25% | ~1.5% | ~8.77% | Highest state rate; groceries generally exempt |
| Texas | 6.25% | ~1.9% | ~8.19% | Local rate capped at 2%; groceries exempt |
| States with no statewide sales tax: Alaska, Delaware, Montana, New Hampshire, Oregon. Note: Alaska permits local sales taxes; Montana applies a limited tax on lodging and services. |
Source: Tax Foundation, State and Local Sales Tax Rates, 2024. Figures are averages of locally collected rates weighted by population and are illustrative, not official rate tables. Verify the exact combined rate for your purchase location on your state revenue department's rate finder.
Last verified: October 2026. Calculator figures are outputs for the inputs entered; they are not live quotes, current rates, or an offer.