The shelf tag says $12. The card terminal says something else. Most shoppers assume the gap is one sales tax set by the state. Often it is not. A state, a county, a city, and sometimes a transit district can each add a slice, and a merchant can add a charge of its own near the bottom of the slip.
Why the same purchase can cost different amounts
Sales tax applies to retail sales of goods and some services. The rate you pay depends on where you buy. According to the Tax Foundation's 2026 midyear rate update, 45 states levy a statewide sales tax and 38 states let local governments add their own. Alaska has no statewide tax, yet some of its local governments collect one.
Local rates can be large. The same Tax Foundation material says they sometimes rival or exceed the state rate. So two people buying the same washing machine at the same sticker price can pay different totals if one store sits inside a city line and the other does not. Local rates are set by local bodies, so they can change on a different schedule than the state's.
One caution on sourcing. The Tax Foundation is a nonprofit research group, not a government agency. It is useful for comparing states. For the rate that actually applies to your address, use your state department of revenue.
Why governments care about the register
Sales tax is a big revenue source. The Tax Foundation reports that it makes up about 32 percent of state tax collections and about 13 percent of local tax collections. It puts the combined share at about 24 percent. The pages we reviewed do not tie those shares to a precise data year, so treat them as rough.
This matters at checkout for a plain reason. When a city or county needs money, a quarter-point added to the local rate is easy to pass. Nothing on the shelf changes. Only the total does.
Tax or fee: how to tell the difference
A sales tax is a percentage set by a government and sent to the public treasury. A fee is broader. A government can charge one for a specific service or permit. A merchant can also add its own charge for delivery, card processing, or service. Those merchant charges are not taxes, even when they sit right under the tax line.
The Federal Trade Commission has a rule on unfair or deceptive fees. Its announcement set the effective date at May 12, 2025, so that date has passed. The FTC pages we reviewed do not spell out which fees or industries the rule covers. Do not assume it governs an ordinary retail receipt. The agency's fee rule FAQ is the place to check scope.
How to check your own receipt
Start with a worked example. The rates here are made up. Say you buy $100 of goods where the state rate is 6 percent and the local rate is 2 percent. The combined rate is 8 percent. Tax is $8.00 and the total is $108.00. If the receipt shows $106.00 or $110.00, something is off, or something else was added.
- Find the combined rate for the store's location on your state department of revenue website. Many states post lookup tools or rate tables.
- Multiply the pre-tax subtotal by that rate. Compare it to the tax line.
- Read every other line. A delivery, service, or processing charge is a merchant fee, not tax.
- Ask the store which lines are taxes and which are its own charges, and whether a fee was shown before you paid.
- For online orders, check which address the rate was based on. Delivery location can set the rate.
Some items are exempt in some states, such as certain groceries. If a taxed item looks wrong, check your state's exemption list before you complain. A small difference can come from rounding or a local district you did not know about.
If a charge still does not add up, ask for an itemized explanation. Keep the receipt. A tax error is usually a store system problem. A fee you were never told about is a different matter, and your state attorney general or consumer protection office can tell you what applies.
Please seek a professional. This article is general information, not financial, tax or insurance advice. Please seek a licensed financial, tax or insurance professional about your own situation.
