Sales Tax Calculator
Sales tax questions run in two directions. Sometimes you have a price and need to know the total after tax. Other times you're staring at a receipt total and need to work backward to the pre-tax price, or figure out what rate you were actually charged. This calculator handles all three, so you're not stuck doing the algebra by hand.
| Value | Amount |
|---|
What Sales Tax Is
Sales tax is a percentage-based charge added to the price of most goods and, in some places, services, collected by the seller at the point of sale and passed on to state or local government. It's separate from income tax and is generally regressive, since everyone pays the same rate on a purchase regardless of income. In the United States there's no federal sales tax — every rate you pay is set by a combination of state, county, city, and sometimes special district taxes stacked together into one combined percentage.
- Charged as a percentage of the purchase price at checkout
- Set by state and local governments, not a federal rate
- Combined rate can include state + county + city + special district taxes
- Five U.S. states charge no statewide sales tax at all
- What's taxable varies — groceries and medicine are often exempt or reduced
Sales Tax Formulas
| Solving For | Formula |
|---|---|
| Tax Amount | Tax = Price × (Rate ÷ 100) |
| Total After Tax | Total = Price + Tax = Price × (1 + Rate ÷ 100) |
| Price Before Tax | Price = Total ÷ (1 + Rate ÷ 100) |
| Tax Rate | Rate = [(Total ÷ Price) − 1] × 100 |
A common mistake when reversing sales tax off a receipt is subtracting the tax rate directly from the total instead of dividing — for example, treating an $86 total at 7.5% tax as $86 × 0.925, rather than $86 ÷ 1.075. Those two numbers are close but not equal, and only the division gives the exact pre-tax price.
How Sales Tax Is Actually Applied
Sales tax is calculated once, at checkout, on the final taxable price of an order — after coupons and discounts are applied, but usually before shipping charges, which some jurisdictions tax and others don't. On multi-item purchases, tax is typically calculated on the combined subtotal rather than item by item, which occasionally causes a one-cent difference from calculating tax per item and summing the results, due to standard rounding.
| Step | Example ($80 item, 7.5% tax) |
|---|---|
| 1. Start with the taxable price | $80.00 |
| 2. Multiply by the tax rate | $80.00 × 0.075 = $6.00 |
| 3. Add tax to the price | $80.00 + $6.00 = $86.00 |
| 4. Round to the nearest cent | $86.00 |
Sales Tax Rates Vary Widely by Location
Unlike a national VAT, sales tax rates in the U.S. are stacked together from multiple layers of government, so two stores a few miles apart can charge noticeably different combined rates. Because rates change fairly often as local governments adjust budgets, this calculator lets you type in the exact combined rate for your area rather than guessing from a fixed table — check your state or local revenue department's website for the current rate that applies to your purchase.
- State-level rate. The baseline percentage set by state government, ranging from 0% to around 7% depending on the state.
- County and city add-ons. Local governments frequently layer their own percentage on top of the state rate.
- Special districts. Some areas add a small additional rate for transit, stadiums, or other local projects.
- No statewide sales tax. A handful of states charge no statewide sales tax, though some still allow local jurisdictions to charge their own.
What's Usually Taxed vs. Exempt
| Category | Typical Treatment |
|---|---|
| General merchandise | Taxable in most jurisdictions |
| Groceries (unprepared food) | Often exempt or taxed at a reduced rate |
| Prepared restaurant food | Usually fully taxable |
| Prescription medication | Commonly exempt |
| Clothing | Exempt in some states, taxable in others |
| Digital goods & services | Treatment varies significantly by state |
These categories are general patterns, not guarantees — exemptions, reduced rates, and definitions of "taxable" differ enough between states and even between cities that the only reliable source for a specific purchase is the relevant state or local tax authority.
Sales Tax vs. VAT
Sales tax and value-added tax (VAT) both ultimately fall on the end consumer, but they're collected differently. Sales tax is charged once, at the final retail sale. VAT is collected at every stage of production and distribution — a lumber mill, furniture maker, and retailer each charge VAT on their sale, but each also reclaims the VAT they paid on their own inputs, so only the value each business actually added gets taxed at that stage. The consumer-facing math ends up similar, but VAT systems (common outside the U.S.) require far more business-side accounting than a single point-of-sale tax does.
When You'd Reverse-Calculate Sales Tax
- Expense reports and bookkeeping. Separating the pre-tax price from tax paid on a receipt for accurate expense categorization.
- Checking a receipt for errors. Confirming the tax rate applied matches what your location should actually charge.
- Budgeting for a purchase. Working out what a listed "tax included" price actually costs before tax, to compare against a tax-exclusive price elsewhere.
- Reselling or wholesale calculations. Figuring out the taxable base price when only a final charged amount is known.
Frequently Asked Questions
Q: How do I calculate sales tax on a price?
A: Multiply the price by the tax rate expressed as a decimal, then add that amount to the original price. For example, a $50 item with an 8% tax rate has $4.00 in tax, for a total of $54.00.
Q: How do I find the pre-tax price from a total on a receipt?
A: Divide the total amount by 1 plus the tax rate as a decimal. For example, a $54 total at an 8% tax rate divided by 1.08 gives a pre-tax price of $50.00.
Q: How do I figure out what sales tax rate was charged?
A: Divide the tax amount by the pre-tax price and multiply by 100 to get a percentage, or if you only have the pre-tax price and the total, divide the total by the pre-tax price, subtract 1, and multiply by 100.
Q: Is sales tax the same in every state?
A: No. Sales tax in the United States is set at the state level and often layered with additional county and city taxes, so the combined rate can vary significantly even between neighboring cities, and five states charge no statewide sales tax at all.
Q: What is the difference between sales tax and VAT?
A: Sales tax is charged only once, at the final point of sale to the end consumer, while VAT is collected incrementally at each stage of production and distribution, with businesses along the way reclaiming the VAT they paid on their own inputs.
Q: Are all products and services subject to sales tax?
A: No. Many jurisdictions exempt or partially exempt categories such as groceries, prescription medication, and certain services from sales tax, and the exact list of taxable versus exempt items varies significantly by state and locality.
This calculator provides estimates for informational purposes only and does not constitute tax advice. Actual sales tax rates and exemptions depend on your specific state, county, city, and the type of item purchased. Consult your local tax authority or a licensed tax professional for guidance specific to your situation.