Use Tax: The Sales Tax You Owe When Nobody Collected It

The tax most small businesses don't know they owe

Almost every owner understands sales tax: you collect it from customers and remit it to the state. Far fewer understand its quiet twin, use tax — the tax you owe when you buy something taxable for your business and the seller didn't charge sales tax on it. Use tax exists to close an obvious loophole: without it, you could dodge sales tax entirely just by buying from an out-of-state vendor who doesn't collect it. States don't allow that, so they make the buyer self-assess and pay the equivalent tax directly. It's one of the most commonly overlooked liabilities in a small business, and it's a favorite target of state auditors precisely because so few businesses track it. (General education, not tax advice.)

When use tax applies

Use tax generally kicks in when you buy something taxable, for use in your business, and no sales tax was collected at purchase. The classic triggers:

• Out-of-state purchases. You buy equipment or supplies from a vendor in another state who isn't required to (or simply doesn't) charge your state's sales tax. If the item would have been taxable had you bought it locally, you likely owe use tax on it.
• Online and marketplace purchases where no tax was charged. Marketplace-facilitator laws have made this less common, but it still happens — especially with smaller or foreign sellers.
• Inventory you pull for your own use. This one surprises people. If you buy inventory tax-free using a resale certificate — because you intend to resell it and collect tax then — but you instead consume it in your own business (say, a shop that pulls a part off the shelf to fix its own truck), you never collected sales tax from a customer, so you owe use tax on what you took.

The rate is typically the same as your local sales-tax rate, and it's owed to the same state — often reported right on your regular sales-tax return, on a dedicated "use tax" line.

Why auditors love it

Use tax is a prime audit finding for a simple reason: it leaves a paper trail on your side but not the state's. When you buy from an out-of-state supplier, that vendor never files anything with your state, so the state has no record the sale happened — until an auditor pulls your purchase records and cross-checks them against what you self-reported. Untaxed equipment purchases, out-of-state supply orders, and inventory withdrawals are exactly what they look for. Getting this right isn't optional polish; it's audit readiness for a liability that's easy to forget and expensive to owe with penalties and interest attached.

Recording and remitting it

The practical workflow is straightforward once you know to look for it:

• Flag untaxed taxable purchases as you enter them. When you record a bill or expense from a vendor who didn't charge sales tax on a taxable item, note that use tax may apply. The moment to catch it is at bank-feed categorization or bill entry, not months later.
• Accrue the liability. The use tax you owe is a liability, the same way collected sales tax is. It sits on your balance sheet as Use Tax Payable until you remit it.
• Remit it with your sales-tax return. Most states let you report and pay use tax on the same periodic return you already file for sales-tax compliance, on a separate line — so it's usually one extra number, not a whole new filing.

A quick worked example

You buy a two-thousand-dollar piece of equipment from an out-of-state supplier who doesn't charge your state's sales tax. Your local rate is 8 percent. Nobody collected the one hundred sixty dollars of tax at purchase — so you owe it as use tax. You accrue one hundred sixty dollars to Use Tax Payable when you record the purchase, and you report and pay it on your next sales-tax return. Done properly, it's a small, boring line item. Missed for a few years and caught in an audit, it becomes a back-tax bill plus penalties and interest on every untaxed purchase they can find.

The lesson is simple: sales tax and use tax are two halves of the same rule. If a taxable purchase came in without tax on it, that tax didn't disappear — it just became yours to self-report.

Hosting Books lets you categorize purchases and flag the ones where no sales tax was charged, so the taxable-but-untaxed buys that create a use-tax liability are visible in your records instead of buried in the bank feed.

This article is general educational information about tax concepts and is not tax or legal advice for your specific situation. Use-tax rules, rates, and reporting vary by state — consult a professional.