How Sales Tax Rates Stack
The rate you pay at the register is rarely "the" state rate. It is state + county + city + special-district taxes stacked on your address (or, in "origin-sourced" states like Texas and Illinois for some sales, on the seller's address). That's why the same chain store can charge different rates two suburbs apart, and why the local add-on field matters: state rates range from 0% to 7.25%, but local add-ons average 1–2% and can exceed 7% in parts of Illinois, Oklahoma, and Louisiana — whose 10.13% combined average is the nation's highest.
Five states levy no statewide sales tax at all: Alaska, Delaware, Montana, New Hampshire, and Oregon. (Alaska allows cities to impose local sales taxes, so "no sales tax" there means no state tax.)
Working Sales Tax Backwards from a Total
Splitting a receipt is the classic reverse problem: you have the total and need the tax. Never divide the total by the tax rate — divide by (1 + rate). At a 9% combined rate, a $109 total is $109 ÷ 1.09 = $100 before tax and $9 of tax. The calculator's "Back it out of a total" mode does exactly this; it's how you allocate receipts for expense reports, reimbursements, and bookkeeping in every state.
Groceries, Clothing, and Other Exceptions
Sales tax bases differ more than rates do. Most states reduce or exempt unprepared groceries; about a dozen tax them fully (the outlier: Illinois and a handful of others, though several repealed grocery taxes recently — this area moves). Clothing is fully taxable in most states but exempt in Minnesota, New Jersey, and Pennsylvania (New York and Vermont exempt items under set price caps). Prescription drugs are exempt nearly everywhere; restaurants, delivery fees, and "sugary drink" surcharges usually aren't.
Then there's the quiet sibling of sales tax: use tax, owed on out-of-state purchases that weren't taxed — the legal basis states used to require marketplaces to collect tax on online purchases. Since 2018's South Dakota v. Wayfair decision, major marketplaces collect at checkout, which is why the "tax-free internet" mostly disappeared.
Common Questions
How do I find my exact local sales tax rate?
Your state's revenue department publishes address-level lookup tools, and the rate printed on any recent receipt from a store near you is ground truth. The calculator presets the state rate and asks you to add your local component (typically 1–2%, higher in parts of IL, OK, and LA), because city and county rates legitimately differ between neighborhoods.
Which states have no sales tax?
Five states levy no statewide sales tax: Alaska, Delaware, Montana, New Hampshire, and Oregon. Alaska allows local sales taxes, so some Alaskan cities charge them, while the other four are genuinely sales-tax-free for most purchases — which is why big purchases near their borders sometimes migrate across state lines.
How do I calculate sales tax backwards from a total?
Divide the total by (1 + the tax rate as a decimal), then subtract. For a $108.50 receipt at 8.5%: $108.50 ÷ 1.085 = $100 before tax, and $8.50 of tax. Never multiply the total by the tax rate — that computes tax on tax. The 'Back it out' mode above does this for expense reports and bookkeeping.
Are groceries taxed?
It varies more than rates do. Most states exempt or reduce tax on unprepared groceries, but about a dozen tax them fully — and several have repealed their grocery taxes in recent years, so this is an area worth checking for your state. Prepared food, restaurant meals, and delivery fees are taxable nearly everywhere. Prescription drugs are exempt in almost every state; clothing is exempt only in a few (Minnesota, New Jersey, Pennsylvania, with price caps in New York and Vermont).
Related Calculators
- Discount Calculator — Sale prices before tax is added
- Percentage Change Calculator — Rate changes over time
- Unit Price Calculator — Compare real per-unit costs