Most business owners understand sales tax: you charge it on taxable sales, collect it from customers, and remit it to the state. Use tax is the mirror-image obligation almost nobody thinks about until an audit surfaces it — and it applies to purchases, not sales, which is exactly why it catches businesses off guard.
What Use Tax Actually Is
Use tax applies when your business buys a taxable item or service and doesn't pay sales tax on it at the time of purchase — most commonly because the seller is out-of-state and didn't charge your state's sales tax, or because you bought something tax-exempt for resale but then used it internally instead. In either case, your state still expects the tax revenue it would have collected if the purchase had happened locally, and the obligation to remit it shifts to you, the buyer. The tax rate is generally identical to your local sales tax rate; only who's responsible for paying it changes.
The Most Common Trigger: Out-of-State Online Purchases
Even though most large online retailers now collect sales tax automatically in states where they have a tax presence, plenty of smaller vendors, specialty suppliers, and out-of-state auctions still don't. When a business buys equipment, software licenses, or supplies from one of these sellers and no sales tax was charged, use tax on that purchase is technically owed directly to the state. This is the single most common source of unreported use tax liability for small businesses.
The Resale Certificate Trap
Businesses that buy inventory tax-free using a resale certificate are certifying that the goods will be resold, not consumed internally. When inventory purchased tax-free gets pulled for business use instead — a retailer keeping a piece of merchandise for the showroom, a contractor using materials bought for a job on their own property — use tax becomes due on that item at the time it was diverted from resale to use. This is one of the first things state auditors check, because resale certificates create an easy paper trail from tax-free purchase to eventual use.
Software and Digital Services Complicate Things Further
Many states now tax software-as-a-service subscriptions, downloaded software, and certain digital services, but the rules vary significantly by state and change frequently. A business subscribing to cloud software from an out-of-state vendor that doesn't charge sales tax may owe use tax on those subscription fees depending on the state's specific rules — a category many businesses never think to check because the transaction doesn't feel like buying a "product."
How Use Tax Gets Discovered
State auditors are well practiced at finding unreported use tax. A sales tax audit routinely includes a review of the accounts payable ledger and fixed asset purchases, comparing what was bought against what sales tax was actually paid on the invoice. Any gap becomes an assessed use tax liability, often with interest and penalties added, and often covering several years of transactions at once because states can generally look back further than a single tax period.
Building a Simple Compliance Process
The fix doesn't require sophisticated software for most small businesses: a periodic review (quarterly is reasonable) of accounts payable and larger purchases, checking whether sales tax was charged on each vendor invoice, and self-assessing and remitting use tax on anything where it wasn't. Many states provide a line on the regular sales tax return specifically for reporting use tax owed on out-of-state and other untaxed purchases, so it doesn't require a separate filing in most cases — just a habit of checking.
Multi-State Businesses Face Added Complexity
A business with locations, remote employees, or significant purchasing activity across multiple states needs to track use tax obligations separately for each state, since rates, exemptions, and rules differ. Businesses that have grown into multiple states without updating their tax compliance process are especially exposed here, because the process that worked fine for one state often quietly breaks down once purchases start flowing across state lines.
Use tax rarely gets the attention sales tax does because no customer-facing transaction reminds a business it exists. But from a state auditor's perspective, it's simply the other half of the same tax base, and it's one of the more common findings in a routine sales and use tax audit. A short quarterly review of untaxed purchases is a small amount of effort compared to years of accumulated liability discovered all at once.
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