If you bought something from an out-of-state seller who didn’t charge sales tax, your state almost certainly expects you to pay use tax on that purchase yourself. Use tax on out-of-state purchases is the mirror of sales tax: same rate, same taxable items, same exemptions, just paid directly by you instead of collected by the seller. Most states have you report it on a line of your annual state income tax return; a handful use a separate consumer use tax form. Five states have no general sales tax and therefore no use tax at all.
The obligation sits on you as the buyer, even though it’s the seller who failed to collect. What has changed dramatically in recent years is how many of your purchases actually trigger this. Marketplace facilitator laws have pulled most everyday online shopping out of the use tax picture, but plenty of transactions still slip through.
When You Actually Owe Use Tax
Nearly every state with a sales tax now requires large online marketplaces and auction platforms to collect and remit sales tax on behalf of their third-party sellers. These laws took effect between 2018 and 2021.1Streamlined Sales Tax Governing Board. Marketplace Facilitator State Guidance If you buy through one of the major marketplaces and see sales tax on the receipt, you owe nothing further on that transaction.
Separately, under the Supreme Court’s 2018 ruling in South Dakota v. Wayfair, Inc., a state can require remote sellers to collect its sales tax once they exceed a threshold of sales into the state, typically $100,000 in annual sales.2Supreme Court of the United States. South Dakota v. Wayfair, Inc.3Streamlined Sales Tax Governing Board. Remote Seller State Guidance Larger sellers with a standalone website will usually be over that line and collecting.
Your use tax obligation kicks in for the purchases that fall outside both systems. The common ones:
- Small independent sellers with their own website who don’t hit your state’s economic nexus threshold. This covers many artisans, hobbyists, and niche retailers.
- Private-party purchases from an individual, including used appliances, furniture, and collectibles.
- International vendors shipping from outside the United States.
- In-person purchases made while traveling in a state with a lower rate, or no sales tax, than your home state.
- Catalog and mail-order companies that don’t collect in every state.
The general rule: if the item would be taxable at a local store, it’s taxable when purchased remotely. That covers electronics, furniture, clothing, jewelry, sporting goods, and most other physical products. Roughly half of states also tax at least some digital products, including software, e-books, streaming subscriptions, and downloaded media. Exemptions carry over from sales tax too, so prescription medications and most grocery staples stay exempt on the use tax side as well.
How to Calculate What You Owe
Use your combined state, county, and local sales tax rate at your home address, not just the headline state rate. Local layers can add meaningfully to the total. Your state tax agency’s website will have a lookup tool where you enter your address and get the exact combined rate.
The tax base is the purchase price. Whether shipping and delivery charges are included varies by state. Some states exempt separately stated shipping on taxable goods; others tax delivery charges regardless. Shipping bundled into the product price is almost always taxable. When in doubt, include shipping.
Credit for Tax Paid to Another State
If you already paid sales tax to the seller’s state, nearly every state credits that amount against your use tax bill. Say you bought a $1,000 item while visiting a state with a 4% sales tax and paid $40. Your home state’s combined rate is 7%, so your use tax is $70. After the $40 credit, you owe $30. If the other state’s rate was higher than your home rate, you owe nothing, but you don’t get a refund for the difference either.
Keep the receipt showing the tax paid. Without documentation, you’ll owe the full use tax rate as if no tax had been collected.
Adding Up the Year
You don’t report each purchase separately (vehicles and similar items are the exception, covered below). Add up all your untaxed purchases for the calendar year, apply your combined local rate to the total, subtract any credits, and report the final figure. A simple spreadsheet with date, vendor, price, and tax paid handles this fine.
Vehicles, Boats, and Other Registered Items
Big-ticket items requiring registration are handled separately. When you buy a car or boat out of state, you’ll pay use tax at title transfer or registration through your state’s motor vehicle agency, not on your income tax return. The agency requires proof of the purchase price and any sales tax already paid, applies the credit at the counter, and won’t complete the registration until the tax is settled. There’s no way to accidentally skip this one.
How to Report and Pay
Three approaches cover almost every state:
- A dedicated use tax line on your state individual income tax return. This is the most common path for ordinary consumer purchases in income-tax states. You enter the yearly total, and it’s added to your liability or subtracted from your refund.
- A separate consumer use tax return, filed online through the state’s portal or on paper. States without an income tax still impose sales and use tax and use this route.
- A lookup table or safe harbor. Some states offer an estimated use tax amount based on your income level for taxpayers who haven’t tracked every purchase. That estimate can be reasonable if your untaxed spending was modest. If you made significant untaxed purchases, the actual calculation will be higher, and you should use it instead.
The filing deadline generally matches your state income tax deadline, which for most states lines up with the federal April 15 date.4Internal Revenue Service. When to File Separate use tax returns may run on their own schedule.
What Happens If You Don’t Report
Skipping use tax on modest purchases feels low-risk, and enforcement against small consumer amounts is uncommon. Two things make ignoring it riskier than it looks.
First, penalties and interest. States charge both, and they accumulate. Penalty structures vary from a flat percentage of the unpaid tax to monthly penalties that stack over time. Interest runs from the original due date and often compounds monthly.
Second, information sharing. State tax agencies exchange taxpayer data, audit reports, and nexus information with each other through formal agreements administered by organizations like the Multistate Tax Commission.5Multistate Tax Commission. Memorandum of Understanding They also pull data from vehicle registrations, customs records on international shipments, and financial records during broader audits. Big-ticket items leave the clearest trails, but smaller patterns can surface once an auditor is already looking at your records.
The bigger structural problem is the statute of limitations. In most states, the assessment clock only starts running once you file. A typical state gives its revenue department three to four years to challenge a filed return, but if no return exists, there’s no clock. Some states codify this as an unlimited assessment period for non-filers; others use extended six- to eight-year windows. Either way, the state can come looking years or decades later.
Voluntary Disclosure If You’re Behind
If you’ve been ignoring use tax for years, a voluntary disclosure agreement is usually the cleanest way out. Most states offer one. The typical structure limits the lookback to about four years, so you owe tax and interest for that window rather than for your entire history of non-compliance. Late-filing and late-payment penalties are usually waived; interest on the unpaid tax is not.
The critical condition is that you come forward first. Once you receive an audit notice or assessment, voluntary disclosure is off the table. Some states also run temporary amnesty programs that go further than the standard offer, sometimes waiving a portion of interest as well. The Multistate Tax Commission coordinates voluntary disclosure across multiple states at once, which is useful if you owe in more than one jurisdiction.6Multistate Tax Commission. Voluntary Disclosure Agreement (Prospective)
Records to Keep
Track every out-of-state purchase during the year: date, vendor, price, sales tax collected if any, and whether the purchase went through a marketplace that collected tax. That last detail decides whether you owe anything at all. Receipts, order confirmations, shipping records, and credit card statements are all adequate documentation.
Hold onto these records for at least as long as your state’s assessment statute, generally three to four years from the filing date. If you never filed, the state’s window stays open, so retention has no practical expiration.