Sales Tax vs. Use Tax: What's the Real Difference?
Sales tax is collected by a retailer at checkout and sent to the state, while use tax is the same tax rate owed directly by the buyer when no sales tax was charged — and the sales tax vs. use tax question matters most for online and out-of-state purchases, where sellers often collect nothing at all.
Sales Tax vs Use Tax: Side-by-Side
| Sales Tax | Use Tax | |
|---|---|---|
| Who collects it | The retailer, at checkout | No one — it's self-reported by the buyer |
| When it applies | At the moment of a taxable sale | When you use, store, or consume a taxable item and no sales tax was paid |
| Who remits it to the state | The seller | The buyer, via a tax return or standalone form |
| Typical trigger | In-store or online purchase from a seller with nexus in your state | Purchase from an out-of-state seller with no nexus, or an item bought tax-free elsewhere |
| Tax rate | State + local sales tax rate | Same rate sales tax would have been |
| Enforcement | Audited at the business level | Rarely enforced on individuals, but rising via data-matching |
| Where you report it | Baked into the receipt total | State income tax return or a dedicated use tax form |
Which should you choose?
Sales tax and use tax charge the same rate for the same reason — taxing what you buy — but only one of them relies on you to self-report. If a seller doesn't charge sales tax, whether that's a small out-of-state online shop or an item hauled home from a lower-tax state, you owe use tax on it.
Track big untaxed purchases through the year and report them on your state return's use tax line; skipping it isn't a loophole, it's unpaid tax that states are getting better at finding.
What is sales tax?
Sales tax is a percentage added to the price of a taxable purchase at the register or checkout screen. The seller collects it from you, then sends that money to the state on a regular schedule, usually monthly or quarterly.
States set their own sales tax rates, and many local governments add their own on top. A jacket bought in a state with a 6% state rate and a 1% local rate carries a combined 7% sales tax.
A seller only has to collect sales tax in states where it has "nexus," a legal connection like a store, a warehouse, or enough sales volume there. That nexus rule is exactly why the sales tax vs. use tax question comes up: plenty of sellers have no nexus in your state and never charge you anything.
What is use tax?
Use tax exists to close the gap sales tax leaves open. It applies when you use, store, or consume a taxable item in your state and nobody collected sales tax on it.
The most common trigger is online shopping. Buy a $2,000 espresso machine from a small out-of-state retailer that doesn't collect sales tax in your state, and you still owe the tax. You just owe it directly to your state instead of paying it at checkout.
Use tax also applies to items bought while traveling. Drive across state lines to buy furniture in a state with no sales tax, then bring it home to a state that taxes furniture, and you owe use tax the moment you start using it there.
Sales tax vs. use tax: the key differences
The tax rate is identical in both cases. Use tax is set at the same rate sales tax would have been on the same item.
What changes is who does the work. With sales tax, the retailer calculates the amount, adds it to your receipt, and remits it to the state. You never think about it again.
With use tax, that entire job falls on you. Nobody calculates it, nobody adds it to a receipt, and nobody automatically sends it to the state. You have to know you owe it, figure out the amount, and report it yourself.
States that belong to the Streamlined Sales Tax Governing Board agree to shared definitions and simplified rate structures, which is part of why far more out-of-state sellers now collect sales tax voluntarily than a decade ago. Even so, plenty of smaller sellers still fall outside that system.
A $2,000 example: what you actually owe
Here's how the math plays out on a real purchase. Say you buy a $2,000 sofa from an online retailer based in a state where it has no warehouses, no employees, and no sales tax obligation to your state.
The retailer ships the sofa and charges you $2,000 flat, with no sales tax line on the invoice. Your home state has a combined 7% sales tax rate. That means you owe $140 in use tax the moment the sofa arrives and you start using it.
Most consumers never report that $140. There's no reminder, no bill, and no automatic deduction, just a single line buried in the state income tax instructions that almost nobody reads. Skipping it isn't a gray area; it's simply unpaid tax.
States have caught on. A growing number of Departments of Revenue now cross-reference shipping records and marketplace sales data to flag residents with large untaxed purchases, then send notices asking for the use tax owed. A $2,000 sofa is exactly the size of purchase that shows up on that kind of review.
How to report and pay use tax
Most states with a sales tax also build a use tax line into the personal income tax return. It's usually a single box asking for the total value of untaxed purchases made during the year.
Some states, like the one covered by the California Department of Tax and Fee Administration, offer a lookup table that estimates use tax based on your income, so you can pay a flat estimated amount instead of tracking every small purchase. That table is meant for everyday items; big purchases like furniture, jewelry, or vehicles usually need to be reported at their actual value.
Businesses face the same rule but with far more scrutiny. A company that buys equipment out of state without paying sales tax has to self-assess and remit use tax, and unpaid use tax is one of the most common findings in a state sales tax audit.
Because there's no automatic collection, most individual filers simply skip the use tax line. That's technically noncompliance, even though enforcement against individuals has historically been light.
Bottom line and practical tax tips
Keep a running list of big purchases where no sales tax was charged: furniture, electronics, jewelry, and anything bought while traveling out of state. A short note in your phone with the date, item, and price is enough.
Check your state's income tax instructions for the use tax line before you file. Even a rough, good-faith estimate is better than ignoring the question entirely.
If you run a business, treat use tax as part of your regular sales tax compliance, not an afterthought. Auditors specifically look for equipment and supply purchases that slipped through without sales tax.
The sales tax vs. use tax distinction comes down to this: they're two collection methods for the same tax. One happens automatically at checkout, and the other depends entirely on you following through.
Frequently asked questions
Do I really have to pay use tax on online purchases?
Yes. If an online seller doesn't charge sales tax in your state, you're legally required to report and pay the equivalent use tax on your state income tax return.
How is use tax different from sales tax if the rate is the same?
The rate matches, but the responsibility flips. A retailer collects and remits sales tax for you; with use tax, you calculate and pay it yourself because no one collected it at the time of purchase.
What happens if I don't pay use tax I owe?
You're technically out of compliance with state tax law, and interest or penalties can apply if the state later assesses the amount. Enforcement against individuals has been limited but is increasing as states use shipping and marketplace data to find large unreported purchases.
Does use tax apply to used items bought from a private seller?
Usually not for casual, one-off sales between individuals, like a garage sale find. Most states aim use tax at purchases from retailers and marketplaces rather than private person-to-person sales, though the exact rules vary by state.
Do all states have a use tax?
Nearly every state that charges sales tax also charges use tax, since one exists to backstop the other. The states with no general sales tax — Alaska, Delaware, Montana, New Hampshire, and Oregon — generally have no use tax either.
Free calculators to help you decide
Sources
We prioritize primary sources for rules, formulas, rates, limits, and definitions. See our calculator methodology and editorial policy.