How to Use a Washington Sales Tax Exemption Certificate

In Washington, the document that lets a business buy inventory or materials without paying retail sales tax is called a Reseller Permit, and it functions as the state’s sales tax exemption certificate for resale purchases. You use a Washington sales tax exemption certificate by presenting a current copy of your Reseller Permit (or an accepted multistate certificate) to your vendor at the time of purchase, so the vendor can legally skip collecting sales tax on items you’ll resell or physically incorporate into a product you sell.¹ The sales tax then gets collected only once, when your end customer buys the finished product.

Two things make this work in practice: giving the vendor the right paperwork, and only using the certificate for purchases that actually qualify. Get either part wrong and the tax, plus a steep penalty, lands back on you.

What the Certificate Covers

A Reseller Permit covers items your business buys specifically to resell, or to physically incorporate into a product you sell. A furniture store buying tables from a distributor, a bakery purchasing flour for bread, and a construction contractor buying lumber for a client’s project are all textbook uses. The permit also covers contract labor tied to retail or wholesale construction work.¹

Where businesses get into trouble is using the certificate for things the business itself consumes. The Department of Revenue draws a hard line here:¹

Personal or household items unrelated to business operations.
Promotional products and free samples, even when they help generate business.
Supplies and equipment the business uses rather than resells, such as office furniture, computers, and cleaning supplies.
Items used to perform your services, even if you bill a customer for them.
Tools and equipment, unless your business is specifically in the business of reselling or renting them.
Equipment rentals for your own use.
Materials for public road construction or U.S. government contracts, which fall under separate tax rules.

The line between “resale item” and “business consumption” trips up more buyers than any other issue. A landscaping company that buys plants to install in a client’s yard is reselling the plants. The same company buying a lawnmower to use on job sites is consuming it, even though the mower is essential to the work.

Presenting the Permit to a Vendor

When you make a wholesale purchase, give your vendor a copy of your Reseller Permit. A printed copy or a digital file both work. The permit must show your Unified Business Identifier (UBI) number, and it should be accompanied by a description of the items you’re purchasing for resale. Without a valid permit on file, your vendor has no legal basis for skipping sales tax on the transaction.²

If your permit expires or gets renewed, send an updated copy to every vendor you buy from. Vendors are under no obligation to keep selling to you tax-free on the strength of an expired permit, and letting one lapse means any purchase you make without a valid permit will be subject to sales tax.¹

In lieu of a Washington Reseller Permit, buyers who are registered with the department can also give a vendor a Streamlined Sales Tax exemption certificate or another department-authorized certificate, provided it includes the buyer’s Washington reseller permit number.²

Accepting and Verifying a Certificate as a Seller

The burden of proving that a sale is wholesale rather than retail falls on the seller. That is why documentation matters so much on your side of the counter. You must keep a copy of the buyer’s Reseller Permit on file and retain it for at least five years after the sale.³

To confirm that a buyer’s permit is currently valid, use the Department of Revenue’s “Look up a business” tool online. On the business lookup page, click the “Reseller Permit” button and enter the permit number to check its status.⁴ Make this a routine step for new buyers. Accepting a revoked or expired permit does not protect you from tax liability.

You may also accept alternative certificates depending on the buyer’s situation. For buyers who are registered with the department, a Streamlined Sales Tax exemption certificate or another department-authorized certificate is acceptable as long as it includes the buyer’s Washington reseller permit number. For buyers who are not required to register in Washington, you can accept a Multistate Tax Commission (MTC) Uniform Sales and Use Tax Resale Certificate, a Streamlined Sales Tax exemption certificate, or other authorized certificates, and in those cases a Washington reseller permit number is not required.²

Out-of-State Buyers Purchasing From Washington Sellers

If your business is located outside Washington and you want to buy goods from a Washington vendor without paying sales tax, you don’t necessarily need a Washington Reseller Permit. What you need depends on whether your business is required to register with the Washington Department of Revenue.

Businesses not required to register in Washington can present a Streamlined Sales and Use Tax Agreement (SSUTA) Certificate of Exemption or a Multistate Tax Commission Uniform Resale Certificate to claim the resale exemption. Neither form requires a Washington reseller permit number.⁵ Washington appears on both the SSUTA and MTC certificate lists as an accepting state.⁶

If your out-of-state business is required to register in Washington because you have nexus here, you need a Washington Reseller Permit. You can still use the SSUTA exemption certificate as the form, but it must include your Washington reseller permit number.⁵ The responsibility for determining whether you qualify for the exemption falls on you as the buyer, not on the seller.

Penalties for Misusing the Certificate

Using your Reseller Permit to skip sales tax on items the business actually consumes is one of the most expensive mistakes a Washington business can make. The department imposes a penalty equal to fifty percent of the tax that should have been paid on the improperly purchased items. That penalty stacks on top of the full amount of unpaid tax plus interest.³ The penalty applies even if you had no intention of evading the tax. Honest mistakes get the same treatment as deliberate fraud.

Using a permit that has been revoked or invalidated triggers the same fifty-percent penalty.³ If the department revokes your permit, it sends written notice with an effective date, and any purchase made after that date under the old permit number counts as improper use.

When a Resale Item Becomes a Business-Use Item

Sometimes a legitimate purchase for resale changes course. You bought merchandise to sell, a customer backed out, and you started using the item yourself. You owe deferred sales tax or use tax on the item’s value in that scenario, and the tax applies regardless of whether you still intend to eventually sell it.⁷ If you routinely buy certain products for both resale and your own consumption, report the consumed portion on your excise tax returns.

Getting a Refund if You Paid Sales Tax on a Resale Item

If you paid sales tax on an item you were entitled to buy tax-free, your first step is to go back to the seller and ask for a refund. That is the expected route and usually the fastest. The Department of Revenue steps in only when the seller route fails.⁸

You can apply directly to the department for a refund if the seller is out of business, cannot be located, is financially unable to issue a refund, or agrees a refund is owed but refuses to pay it. Before applying, ask the seller to complete the “Seller’s Declaration for Buyer’s Refund of Retail Sales Tax” form. If they won’t fill it out, you can still proceed without it.⁸

The refund application goes through the My DOR portal. You’ll need electronic copies of your receipts or invoices showing the purchase date, location, seller’s name, purchase price, and the amount of sales tax you’re requesting back. The refund amount cannot exceed the sales tax shown on the receipt.⁸

1
Washington Department of Revenue. Reseller Permits
2
Washington State Legislature. Washington Code 82.04.470 – Wholesale Sale Reseller Permit Exemption Certificates
3
Washington State Legislature. Washington Administrative Code 458-20-102 – Reseller Permits
4
Washington Department of Revenue. Reseller Permit
5
Washington Department of Revenue. Streamlined Sales Tax Certificate of Exemption
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Multistate Tax Commission. Uniform Sales and Use Tax Resale Certificate
7
Washington State Department of Revenue. Washington Administrative Code 458-20-178 – Use Tax and the Use of Tangible Personal Property
8
Washington Department of Revenue. Apply For A Sales Tax Refund