What Is Sales Tax? How US Sales Tax Works

What sales tax is, and what this guide is not

A sales tax is a percentage of the price of a retail sale, added at the moment of purchase and handed to the government by the seller. It taxes consumption rather than income or property: the trigger is buying something for your own use, which is exactly why buying the same item to resell is not taxed. The classic base is tangible personal property — goods you can touch and carry — plus whatever list of services each state chose to write into its law. New York states the rule in that shape, taxing retail sales of tangible personal property "unless specifically exempted in the law" while noting that "only certain services are subject to tax"¹.

Three features make the American version unusual. There is no federal sales tax at all, so every rule comes from a state and the fifty answers do not agree. States then let counties, cities and special districts levy their own rates on top, so the number on your receipt is a sum rather than a single figure. And the tax is legally separate from the price, which is why American shelf prices are quoted before tax while European ones are not.

This page is the concept, not the rate card. For current figures use the state rate directory, the lookup by ZIP or address or the interactive rate map; if you already know your rate and want only the arithmetic, go straight to how to calculate sales tax.

Two readers are served below, and the rules genuinely differ for them. If you are a shopper, your job is to understand what you are being charged and to recognise the rarer case where you owe tax nobody collected. If you are a seller, your job is to charge the right amount, document every sale where you charged nothing, and hand the money over on time. Each section says which of you it is talking to.

How state, county, city and district rates stack into one combined rate

The rate on your receipt is almost never a state rate. It is a stack: the state rate at the bottom, then every local government whose boundary contains that address, each adding its own slice. Washington puts the mechanism plainly — the state rate is 6.5% and "the local tax rate varies by city and/or county"⁴. The combined rate is what you charge and what you pay. Nothing else is a real number.

Texas shows the tidiest version of the stack, because the legislature capped it. The state imposes "a 6.25 percent state sales and use tax on all retail sales, leases and rentals of most goods, as well as taxable services", and local taxing jurisdictions — cities, counties, special purpose districts and transit authorities — "can also impose up to 2 percent sales and use tax for a maximum combined rate of 8.25 percent"². That is why so many Texas addresses land on exactly 8.25%: the local layers fill the cap and stop. Browse the state in the Texas sales tax calculator.

Texas figures from the Comptroller of Public Accounts²; California figures from the CDTFA rate description, which itemises the statewide 7.25% as 6.00% of state components plus a 1.25% local share, with district taxes ranging from 0.10% to 2.00%³. As of August 2026.

California is the more revealing case, because its statewide base is itself a stack. Of the 7.25% every Californian pays, 3.6875 points go to the state general fund, a quarter point went to the general fund under a measure that lapsed at the end of 2001, half a point is earmarked for the Local Public Safety Fund created in 1993, half a point funds the 1991 realignment and 1.0625 points fund the 2011 realignment — with a further 0.25% for county transportation and 1.00% for city or county operations sitting inside the same base³. District taxes then stack on top. One percentage on a receipt is the visible end of an elaborate funding settlement.

Borders matter more than names

Each layer applies inside its own legal boundary, and those boundaries were not drawn to agree with each other. City limits do not follow county lines, transit districts follow the results of ballot measures, and none of them follow postal geography. New York's own guidance for vendors is unusually blunt about the consequence: "Do not use ZIP codes for identifying customer location. Postal zones usually do not coincide with political boundaries, and using ZIP codes for tax collection results in a high degree of inaccurate tax reporting."¹ That is a revenue department telling sellers that the most popular shortcut in the industry is wrong.

New York also shows how far a single layer can reach. On top of state and local rates, the state imposes an additional sales tax throughout the Metropolitan Commuter Transportation District, which covers the five boroughs of New York City together with Dutchess, Nassau, Orange, Putnam, Rockland, Suffolk and Westchester counties¹. One transit district therefore sets part of the rate for a region larger than several states.

The practical consequences are covered in depth elsewhere on this site: how the county layer behaves in sales tax by county, the transit and stadium layer in special taxing districts, the states where cities administer their own tax entirely in home-rule sales tax states, and the failure mode itself in ZIP-code sales tax accuracy.

Which address decides

One more variable sets the stack: whose address counts. Most states use destination sourcing, so the rate follows the buyer — Washington says retailers "must collect sales tax at the rate based on where the customer receives the goods or services"⁴. A minority use origin sourcing for sales that stay inside the state, where the seller's location governs instead. That single choice explains why an online order and an in-store purchase of the same item can carry different tax; it is unpacked in origin versus destination sourcing. To resolve a real address rather than reason about it, follow the method in finding the rate for an address.

Who legally owes the tax — the buyer, the seller, or both

Everybody knows the shopper ends up paying. Far fewer people know that in a large minority of states the sales tax is not legally the shopper's tax at all, and that this changes what the line on your receipt actually means. Three models are in use, and they look identical at the till.

The third model drops the pretence that this is a tax on shopping at all. Arizona levies a transaction privilege tax: the statute imposes "privilege taxes measured by the amount or volume of business transacted by persons on account of their business activities"⁶. The taxable event is running a business in Arizona, and the tax is merely measured by your receipts. New Mexico is built the same way — its department states that "gross receipts tax (GRT) is imposed on businesses, but it is common for a business to pass the GRT on to the purchaser", and where it is passed on, "it is required to be separately stated on the invoice"⁷. Hawaii's general excise tax follows the same logic.

Why should a shopper care about a distinction that never shows up at the counter? Because it decides several things that do show up later. It governs whether a seller may legally advertise tax-included prices. It explains why the tax reaches categories a conventional sales tax misses, since gross receipts states routinely tax services and even business-to-business transactions that other states exempt. And it determines who is entitled to ask for a refund when tax turns out to have been charged in error — in a seller-tax state the buyer has no direct claim against the government, only against the shop. The mechanics of the privilege-tax version, including the way Arizona cities set their own tax base, are in Arizona TPT versus sales tax, and the broad rule on services is in are services taxable.

Who collects sales tax, and where the money goes

The seller collects, and the seller is the party the state pursues. From the moment the customer pays, the tax portion is not the business's money in any sense — Washington says exactly that: "sales tax collected are considered trust funds and must be remitted to the Department of Revenue"⁴. New York attaches personal consequences to the same idea: responsible persons of a company, including certain owners, officers, directors, partners and members, can be held personally liable for the tax the business owes¹.

This is the single most expensive misunderstanding in small business. Sales tax arrives inside your daily takings and looks like cash flow. It is not revenue, it does not belong in your working capital, and spending it converts an administrative obligation into a personal debt that survives the company. The safest habit is to move the tax portion out of the operating account on the day it is collected and not look at it again until the return falls due.

How much money this is

The scale is easy to underrate. In the Census Bureau's survey of state government tax collections for fiscal 2025, general sales and gross receipts taxes raised $475.2 billion against total state tax collections of $1.536 trillion — a little under 31 cents in every dollar the states collect⁸. Add the selective sales taxes on fuel, alcohol, tobacco, insurance and utilities and the whole sales-and-gross-receipts family reaches $697.4 billion, about 45% of state tax revenue. Individual income tax, for comparison, raised $517.4 billion in the same year⁸.

The national average hides enormous variation, and the variation is the interesting part. States without an income tax lean on sales tax hard enough that their budgets track consumer spending almost in real time, while states with a heavy income tax treat sales tax as a secondary stream. That single ratio explains a great deal about why some legislatures guard the sales tax base so fiercely.

Computed from the Census Bureau's 2025 Annual Survey of State Government Tax Collections, dividing general sales and gross receipts collections by total tax collections for each state⁸. Fiscal year 2025.

Where does the money actually go? Mostly into general funds that pay for schools, health programmes, public safety and roads — but a surprising share is earmarked before it arrives. The California breakdown above is a worked example of earmarking: a Los Angeles shopper is simultaneously funding the state general fund, a local public safety fund and two separate realignments of state and county responsibilities, in fixed proportions written into law³. District taxes are more visible still, because voters approved each of them for a named purpose, which is also why a district rate is one of the few taxes that ever falls: some expire when the thing they financed is paid off.

How to work out the sales tax on a purchase

The arithmetic is trivial once the two inputs are right, and both inputs are where people go wrong: the taxable amount and the combined rate. Everything after that is multiplication and rounding.

1. Start from the taxable amount. Take the price actually charged for the item after any discount the seller funds, before tax. Decide separately whether shipping, handling and installation belong in that figure, because states differ on it.
2. Find the combined rate at the delivery address. Add the state rate to every county, city and special district rate that covers the exact address where the buyer receives the goods. The state rate alone is almost never the right number.
3. Check the item is taxable at that rate. Confirm the category before you multiply. Groceries, prescription drugs and clothing carry reduced rates or exemptions in many states, and some exemptions apply only to the state layer of the stack.
4. Multiply and round. Multiply the taxable amount by the combined rate and round to the nearest cent, unless the state prescribes a bracket table that fixes the tax for each price band.
5. Prove the total. Add the tax to the pre-tax amount and check it against the receipt. If you are the seller, record the rate, the jurisdiction and the date you used, because rates change on scheduled effective dates.

Now change one thing — the address — and nothing else. Ship the identical laptop into the Seattle area instead, where the state rate is 6.5% and the local layers include a regional transit district, and the combined rate in our 2026 city dataset is 10.55%. The item did not change, the seller did not change, and the tax rises by more than a quarter. Compare the two states directly in the Washington sales tax calculator.

When the rate depends on the item

A third example shows why the category matters as much as the location. Mississippi taxes retail sales at 7%, but charges 5% on groceries, defined as food and drink eligible to be purchased with SNAP benefits⁹. Two baskets of $120 bought in the same shop on the same day therefore carry different tax, and a till that applies one rate to the whole transaction gets both of them wrong.

Working backwards from a total

The reverse calculation catches people out because the instinct is to subtract the rate, which is wrong. If a total already includes tax, divide by one plus the rate rather than multiplying by it. A $216.50 receipt at 8.25% came from a $200.00 item, not from $198.65.

Do it automatically with the reverse sales tax calculator, or read the method in calculating tax from a total. For forward calculations at any rate, the sales tax calculator shows the stack as well as the answer.

Rounding is a rule, not a preference

Fractions of a cent have to go somewhere, and states legislate the answer rather than leaving it to the till. California requires sales tax reimbursement included in a price to be "computed to the nearest mill" — a tenth of a cent — and prescribes the exact wording a seller must post in order to charge tax-inclusive prices at all⁵. Several states instead publish bracket tables that fix the tax for each price band, which is why the tax on a small purchase sometimes does not match the percentage exactly. That system is explained in sales tax bracket tables. Rounding differences look trivial on one transaction and become audit findings across a million of them.

What is taxable, and what is not

The default rule in most states is easy to remember: tangible personal property is taxable unless a statute exempts it, and services are exempt unless a statute lists them. New York writes both halves down¹. California says the same about goods and adds a trap worth knowing — service and labour costs are subject to sales tax when they form part of the sale of tangible personal property⁵ — so a service bundled into the sale of a good is usually taxed along with it.

The politically sensitive exemptions are food, medicine and clothing, and they are drawn with surprising precision. Texas exempts food products — "flour, sugar, bread, milk, eggs, fruits, vegetables and similar groceries" — while taxing prepared food, hot drinks, soft drinks, candy and gum, and taxing snack items "when sold in an individual-sized portion or from a vending machine"¹³. The line is not food against non-food; it is grocery shopping against eating out, with sweets and fizzy drinks pushed onto the taxable side. The same packet of crisps can be exempt in a multipack and taxable as a single bag.

Some states reach the same goal with a reduced rate instead of an exemption, as Mississippi does at 5% on groceries and as low as 1.5% for manufacturing machinery and farm implements⁹. A single state can therefore run several general sales tax rates at once, which is another reason a headline rate never settles a real question.

Category treatments are generalisations for orientation. Confirm any specific item with the state, using the linked category guides for the state-by-state detail.

Each row has a guide of its own: the food and clothing lines in grocery and clothing taxability, the restaurant rules in sales tax for restaurants, downloads and subscriptions in digital products sales tax, freight in is shipping taxable by state, and vehicles — which have their own rules and are often taxed where you register rather than where you buy — in car and vehicle sales tax.

Timing can change the answer too. Many states suspend tax on defined categories for a few days a year, usually before the school term, and the categories are narrower than the advertising suggests: a price cap per item is normal, and accessories often fall outside the holiday even when the clothing beside them qualifies. Test a specific basket against a specific holiday with the sales tax holiday calculator.

Exemptions and the certificates that prove them

Exemptions come in three flavours, and confusing them is the most common cause of a failed audit. An exemption can attach to the product (groceries, prescription drugs), to the use the buyer will put it to (goods bought for resale, machinery consumed in manufacturing, farm inputs), or to the buyer (government bodies and, in some states, charities and schools). Only the first is automatic. The other two depend on paperwork.

The resale exemption is the one that keeps the whole system honest. A sales tax is meant to fall once, on the final consumer, so a shop buying stock does not pay tax on it. The shop proves this by giving its supplier a resale certificate. New York sets out the standard rule: a seller need not collect from a purchaser who hands over a properly completed exemption certificate "that you accept in good faith within 90 days of the delivery of property or rendition of a service", and accepting in good faith means having "no prior knowledge that the document is falsely or fraudulently issued"¹.

Read that from the seller's side and the risk becomes obvious. If the certificate is missing, incomplete or late, the exemption evaporates and the seller — not the buyer who claimed it — owes the tax that was never charged, plus penalties and interest. Certificates are therefore not filing; they are inventory. They need to be collected before the sale, validated on receipt, tied to the invoices they cover, and refreshed when they expire. A blanket certificate covering a regular customer is the usual practical answer to that administrative load, and New York expressly allows one rather than requiring a fresh document for each sale¹.

Use tax: the half of the system nobody sees

Sales tax has a twin. Use tax is owed by the buyer, at the same rate, on taxable goods brought into a state when no sales tax was collected on them. New York describes the relationship in four words — "the use tax complements the sales tax" — and gives the classic example: a resident buys taxable goods outside the state and brings them home to use¹. California's guidance says the same and adds the reassurance that matters most in practice, that the sales and use tax rates are identical⁵.

Use tax exists to stop the sales tax being defeated by geography. Without it, everyone near a border would shop across it and every catalogue would ship from a no-tax state. States also prevent double taxation on the same goods: Mississippi, for instance, allows credit for sales or use tax properly paid to another state, with a short list of vehicles, trailers and boats excluded from that credit⁹.

For individuals the practical exposure is small but real: a car bought out of state, furniture collected in a no-tax state, a large purchase from a seller that did not charge tax. Several states collect it through a line on the personal income tax return, which is the only time most people ever meet it. For businesses it is one of the first things an auditor looks at, because untaxed purchases of equipment, software and supplies leave a clear trail in the accounts, and unlike a missed sale they cannot be blamed on a customer. The full comparison is in use tax versus sales tax, and the cross-border shopping question in border shopping and sales tax.

Why online orders are taxed now

For roughly half a century, interstate mail order and then ecommerce operated under a physical presence rule. In 1967 the Supreme Court held in National Bellas Hess that a mail-order company "whose only connection with customers in the State is by common carrier or the United States mail" lacked the contacts needed to be taxed; in 1992 Quill Corp. v. North Dakota preserved that rule for the modern era¹⁰. Buyers still owed use tax on everything they bought that way. Almost nobody paid it.

On 21 June 2018 the Court reversed course. South Dakota v. Wayfair, Inc. held that because the physical presence rule of Quill "is unsound and incorrect", both Quill and Bellas Hess "are overruled"¹⁰. The South Dakota law it upheld applied only to sellers that "on an annual basis, deliver more than $100,000 of goods or services into the State or engage in 200 or more separate transactions"¹⁰ — a threshold shape almost every state then copied, though many have since dropped the transaction count because it swept in tiny sellers with large order volumes.

How much money was at stake depends on who counted. The Wayfair opinion cites an estimate that the old rule cost states "between $8 and $33 billion every year"¹⁰. The Government Accountability Office, examining the same question in 2017, put the recoverable amount lower — states "could gain from about $8 billion to about $13 billion in 2017" — because it also found that states could already reach "about 75 to 80 percent of the taxes that would be owed if all sellers were required to collect tax on all remote sales"¹¹. Both figures are honest; they measure different baselines, and the narrower one is the better guide to what actually changed.

The second change mattered even more for shoppers. States passed marketplace facilitator laws moving the collection duty from the small seller to the platform. Texas states the duty flatly: marketplace providers doing business in Texas "must collect, report and remit state and local sales and use tax on all sales made through a marketplace"¹². That is why an item from a tiny seller on a large marketplace is taxed exactly like an item sold by the marketplace itself, and why the same seller's own website may charge nothing on an identical order.

If you sell online, the two questions that follow are covered in depth in the economic nexus guide and marketplace facilitator laws. To test your own sales against state thresholds, use the economic nexus calculator; if a threshold has already gone past, the recovery sequence is in what to do after crossing a threshold.

Where the sales tax came from

The American sales tax is a Depression-era invention. Property tax collections collapsed with land values, income tax yielded little when incomes vanished, and states needed a levy that produced cash from ordinary daily activity rather than from wealth that no longer existed. General retail sales taxes appeared in the early 1930s and spread across the country within a decade, which is why so many state sales tax statutes share the same architecture: a broad tax on tangible goods, a narrow list of taxed services, and exemptions for food and medicine bolted on much later as the politics of a regressive tax caught up with it.

Today the map is nearly complete. Working from the Census Bureau's fiscal 2025 collections file, only four states report no general sales and gross receipts collections at all — Alaska, Delaware, Montana and New Hampshire⁸. Oregon appears in that column, but its figure is a gross receipts tax on business rather than a tax at the till: Oregon's own department says the Corporate Activity Tax "is not a transactional tax, such as a retail sales tax, nor is it an income tax"¹⁶. Net of Oregon, the familiar count of 45 states plus the District of Columbia holds.

Alaska is the interesting exception

Alaska has no state sales tax and never adopted one, but many boroughs and cities levy their own, so an Alaskan receipt may carry tax while the state collects none of it. Coordinating that for remote sellers required an unusual solution: the Alaska Remote Seller Sales Tax Commission was "established via an intergovernmental agreement in 2019 to coordinate sales tax collection for remote sales into Alaska"¹⁵ — local governments building a single point of contact that the state itself does not provide. The detail is in Alaska sales tax, and the places where a combined rate really is zero are listed in ZIP codes with no sales tax.

The other long-running response to fragmentation is voluntary harmonisation. The Streamlined Sales and Use Tax Agreement, an effort that began in March 2000 and now has 24 full member states, exists "to simplify and modernize sales and use tax administration in order to substantially reduce the burden of tax compliance"¹⁴, mainly by standardising definitions, sourcing rules and rate databases. It is why several states define words like "candy" and "prepared food" in identical language, and why a seller registered through it can file across member states from one registration. See the Streamlined Sales Tax guide. Rates themselves keep moving: the current year's changes are tracked in sales tax changes for 2026, and the rules about when a new rate starts applying in rate change effective dates.

What a business actually has to do

The obligation has four moving parts, in a fixed order, and each one has a characteristic way of going wrong. Nothing here is optional once you have nexus in a state and sell something taxable there.

Register first. Every state requires a permit before you collect, and collecting without one is its own offence. Mississippi puts it in a single line: before engaging in business subject to sales tax, "a permit or registration license is required from the Department of Revenue", with a separate permit for each location⁹. New York warns that you cannot legally make taxable sales or issue most exemption certificates until your Certificate of Authority arrives¹. The process is in how to register for a sales tax permit.

Then collect correctly. That means the right rate for the right address, the right taxability decision for the item, and the tax shown separately on the invoice. Take the rate from an address-level lookup rather than a ZIP table, for the reason New York gives¹.

Then file, on the state's schedule. Frequency is assigned by volume and changes as you grow: New York starts most vendors as quarterly filers and moves them to monthly once taxable sales and purchases reach $300,000 in a quarter, with returns generally due 20 days after the period ends¹. Mississippi also uses the 20th of the following month⁹. A return is due even when you sold nothing — the zero return is the single most commonly missed obligation in the whole system, because nothing prompts you to remember it. Deadlines by state are in sales tax filing frequency and due dates.

Then remit and keep the evidence. Pay with the return, keep detailed records of every sale and the tax due on it¹, and keep the exemption certificates that explain the sales where you charged nothing. Those records are the whole of your defence if the state asks — see what triggers an audit. Miss the deadline and New York imposes a penalty of at least $50 whether or not any tax was due¹, on top of interest that runs from the original date.

Common mistakes and edge cases

These are the errors that recur, in roughly the order they cost people money. The first four apply to sellers; the rest catch shoppers too.

• Charging the state rate. The state rate is the bottom of a stack, not the answer. Charging 6.25% in Texas instead of 8.25% leaves two points to be found later out of your own margin, because you cannot go back and bill a customer who has left.
• Deriving a rate from a city name. City limits, county lines and district borders do not coincide, so an address described as being in a city may not sit inside its taxing boundary at all. Resolve the address, not the label.
• Treating collected tax as cash flow. It is trust money⁴, and the people who run the business can be held personally liable for it¹.
• Accepting an exemption certificate casually. Incomplete, expired or after-the-fact certificates transfer the tax to the seller. New York's 90-day rule and its good-faith standard are typical rather than unusual¹.
• Assuming an exemption applies to the whole stack. It may apply only to the state layer, as New York's clothing exemption does unless the locality opted in¹.
• Believing a no-tax state means no tax. Alaska has local sales taxes without a state one¹⁵, and buying in Delaware or Montana to use somewhere else can trigger use tax at home.
• Assuming online means untaxed. That has been wrong since 2018 for most sellers and most platforms¹⁰¹², and use tax filled the gap even before then.
• Reading a rate as permanent. Local rates change on scheduled effective dates as districts are created, renewed or expire, so a stored rate decays. The rates on this site are documented in tax data sources.

There are also honest edge cases with no intuitive answer: leases and rentals are usually taxed as a series of sales rather than one, trade-ins reduce the taxable amount in some states and not others, layaway is taxed at delivery in some states and at payment in others, and a return after a rate change should be refunded at the rate originally charged. When an edge case has real money in it, get the state's own written position rather than reasoning from the general rule.

One more scenario deserves naming, because the instinct is usually wrong. If you discover you should have been registered in a state for the last two years, the worst move is to register normally and hope the past goes unnoticed: registration invites the question of when your obligation began. Most states run a formal programme that limits how far back they will look in exchange for coming forward, described in voluntary disclosure agreements.

How sales tax compares with VAT and GST

Most of the world does not use a retail sales tax. It uses a value-added tax, which reaches the same destination by a different road. A sales tax is charged once, at the last sale in the chain, and everyone earlier in the chain buys exempt by certifying resale. A VAT is charged at every sale in the chain, and every business reclaims the VAT it paid on its own purchases, so the net tax accumulated equals the tax on the final consumer price.

The practical differences are large. VAT is largely self-policing, because each business has an incentive to document its purchases in order to reclaim tax, whereas a sales tax depends entirely on the last seller in the chain getting the exemption paperwork right. VAT countries quote prices with tax included, which is why American totals surprise European visitors and European shelf prices feel unusually honest to Americans. And VAT covers services by default, while most American sales taxes still treat services as outside the base unless a statute lists them — the single biggest reason the American base has narrowed as the economy shifted from goods to services.

Canada runs a third variant: a federal value-added tax that is combined with the provincial tax in some provinces and sits alongside a separate provincial sales tax in others. The full comparison is in sales tax versus VAT, and the Canadian structure in PST versus GST and HST in Canada.

Where to go next

Pick the thread that matches your question rather than reading the whole library. Each of these continues directly from a section above.

• You want a number. The sales tax calculator for a forward calculation, or the ZIP and address lookup to find the rate first.
• You want to compare places. Sales tax by state, plus the highest and lowest combined rates, or a single state such as New York.
• You are starting to sell. Economic nexus, then registration, then filing deadlines.
• You think you were charged wrongly. Split the receipt with the reverse calculator, then check the rate against ZIP-level accuracy.
• You bought somewhere without tax. Use tax versus sales tax explains what you owe at home, and Oregon is the standard worked case.

One closing caution about sources. Rates and rules change on statutory schedules, and a figure that was right last quarter may not be right now. Everything cited on this page was read from the issuing authority, and every reference below links to it directly — when a real amount of money depends on the answer, open the state's own page rather than any summary of it, including this one.