How a Washington Business Accrues Use Tax on Untaxed Purchases

If your business is in Seattle and your accounts payable queue includes invoices from out-of-state vendors, online tools, or a marketplace, some of those purchases probably owe Washington use tax that no one charged you. Use tax is the quiet twin of sales tax: when a taxable item is used in Washington and sales tax was not collected, the buyer owes use tax at the same rate, and the state expects the business to report it. The short answer for a finance team is to run a short review before each excise-tax filing: pull the invoices with no Washington tax on them, test each one for taxability and where the item is used, accrue use tax on the ones that qualify, and keep a person on the judgment calls.

Which purchases owe Washington use tax

A purchase owes Washington use tax when three things are true at once: the item or service is taxable, Washington sales tax was not already paid on it, and it is used in Washington. The Department of Revenue puts it plainly in its guidance on use tax: use tax is "a tax on the use of goods or certain services in Washington," and an item is "subject to either sales tax or use tax, but not both on the same transaction." The rate is not a separate schedule. RCW 82.12.020 levies the tax on using tangible personal property, prewritten computer software and certain digital automated services as a consumer, at a rate equal to the retail sales tax.

Where the money shows up is the part a finance team misses. DOR lists the common cases: goods bought from an out-of-state or online seller that did not collect Washington sales tax; purchases from a seller not required to register and collect here; business equipment or supplies used without sales tax paid; and goods bought tax-free under a reseller permit that the business then uses itself, which DOR warns "will owe the tax and a 50% penalty – even if no fraud was intended." The reseller-permit side of that trap is its own review; here the point is that a permitted purchase pulled for internal use becomes a use-tax item.

See where a use-tax review fits in a finance team's monthly close.

A screen for pulling the right invoices

You do not need to re-examine every invoice, only the ones where Washington tax is missing or short. This screen is a decision method, not tax advice; confirm specific taxability determinations with DOR or a tax advisor. For a review period, pull each payable whose invoice shows no Washington sales or use tax line, or a tax line below the combined rate for where the item is used. For each one, ask three questions in order:

• Is it taxable? Tangible goods, prewritten and remote-access software, and some services are; a pure professional service such as outside legal advice generally is not. The uncertain ones, such as digital products and mixed bundles, are the reviewer's call, not the rule's.
• Was Washington tax already paid? A marketplace that collected Washington sales tax, or a vendor that charged it, closes the question, because sales tax and use tax are not both due on the same purchase.
• Where is it first used? The rate follows the location where the business first puts the item to use, so a Seattle office and a Bellevue branch can owe different rates on the same order.

What survives all three questions is a use-tax item. DOR says use tax is "due when the item is first used in the state" and "is calculated on the value of the item, which is generally the purchase price," in its publication on determining whether you owe it; the value also includes any freight or delivery the seller billed. Accrue the tax at the first-use location's combined rate and report it on your excise-tax return's Use Tax/Deferred Sales Tax line, entering the location code and the value of articles for each place the goods are used.

A worked use-tax review

The following review is illustrative; the vendors, amounts and taxability calls are assumptions, not a client result or a determination for any real purchase. A Seattle business runs five payables from one month through the screen. For items first used in Seattle it uses the combined rate DOR lists for Seattle, location code 1726, 10.55% (a 4.05% local rate plus the 6.5% state rate), effective October 1 to December 31, 2026, and notes that DOR updates these local rates each quarter.

Three of the five owe use tax. The arithmetic is the rate times the value: $8,400 × 10.55% = $886.20; $3,000 × 10.55% = $316.50; $500 × 10.55% = $52.75, for $1,255.45 for the month, reported on the Use Tax/Deferred Sales Tax line. The marketplace order and the legal fee drop out for different reasons: one already carried Washington tax, the other is not a taxable sale of goods. The reseller-permit pull is the easiest to miss, because the invoice looks settled; it is the use, not the invoice, that triggers the tax.

Where software helps, and where a person owns the call

Reading invoices for a missing tax line, extracting the vendor's state and the ship-to location, and assembling a candidate list is exactly the repetitive extraction that software and AI do well, and for a high-volume payables desk that flagging is worth automating. What a tool cannot do is decide the two questions that actually move dollars: whether a given digital product or service is taxable in Washington, and whether a marketplace already collected the tax. Those are determinations, and getting them wrong in either direction costs money, because over-accruing pays tax you do not owe and under-accruing leaves an audit exposure. Keep a named person, usually the controller or a tax lead, on the taxability call, and let the tool propose the list rather than post the accrual.

What to measure, and what to keep separate

Track the use tax accrued each period and, more usefully, how many flagged invoices the reviewer confirmed as taxable. A flag that is right most of the time is saving work; one that is mostly overturned is just moving it. Keep this number apart from two others it is easy to blur. Use tax on what you buy is not the business-and-occupation tax on what you sell, and neither is the sales tax you collect from your own customers. They sit on different lines of the same return and answer different questions. A clean monthly review mostly prevents the unpleasant version of this problem: a DOR audit of purchase records that finds years of untaxed invoices at once.