Washington marketplace rules separate the facilitator’s sales-tax collection role from the seller’s own tax and reporting responsibilities. A marketplace facilitator generally collects and remits Washington retail sales tax on taxable sales it facilitates, but a seller may still need to register, file returns, and report Business & Occupation (B&O) tax. Washington is not a home-rule state for local sales-tax administration; the Washington Department of Revenue administers the tax, including local rates and location reporting.
The key practical point is that marketplace sales still count when you assess your Washington registration obligations, and B&O tax can be due even when no retail sales tax is due. The rules depend on your physical presence, Washington receipts, the type of sale, and whether the facilitator actually collects tax. Sales Tax Compliance USA is a done-for-you service staffed by people; we can review your sales and help check your Washington obligations.
What counts as a marketplace facilitator in Washington?
Washington defines a marketplace facilitator by what it does, not simply by whether it operates a website. The business must contract with sellers to facilitate sales of their products through a marketplace for consideration, and it must directly or indirectly transmit or communicate the offer or acceptance between buyer and seller. Merely advertising a seller’s products is not enough.
The business must also perform at least one specified marketplace function with respect to the seller’s products, such as processing payments, providing fulfillment or storage, or setting prices. The Washington Department of Revenue’s marketplace-facilitator guidance and RCW 82.08.010(15) describe the definition. If your arrangement is unusual, confirm whether the business qualifies rather than assuming that every online sales channel is a facilitator.
Do facilitators collect Washington sales tax, and which sales are covered?
A marketplace facilitator that makes sales to Washington consumers, including sales on behalf of marketplace sellers, generally must register and collect and remit applicable Washington retail sales tax on taxable facilitated retail sales. The tax is based on the taxable sale and the applicable state and local rate. The facilitator’s collection does not make every transaction taxable: the product, transaction, and any claimed exemption still matter.
The rules cover taxable retail sales made through a qualifying marketplace, including sales of a facilitator’s own products and sales it facilitates for third-party sellers. A seller should check transaction records or obtain confirmation that the facilitator collected Washington tax for the relevant sales. If the facilitator did not collect, do not assume the sale is covered; determine whether you must collect or report tax yourself.
Washington economic nexus and when sellers must register
For a remote marketplace seller without physical presence in Washington, the Department of Revenue says registration is required when, in the current or prior calendar year, the seller has more than $100,000 in combined gross receipts sourced or attributed to Washington, or is organized or commercially domiciled in Washington. The receipts calculation includes Washington income from different activities, not just direct retail sales, and includes exempt sales. Count Washington retail sales made through marketplaces as well as sales through your own channels.
If you meet the threshold, the Department says you must collect and report for the remainder of the current calendar year and the following calendar year. If you cross the threshold during the current year but did not meet it in the prior year, the start date is the first day of the month that begins at least 30 days after the date you met the threshold. A seller with physical presence must register even if it does not meet the economic threshold. Register and manage tax accounts through My DOR. Check the Department’s current instructions for your facts and the current date-sensitive requirements.
What marketplace sellers still need to do
Marketplace collection does not automatically remove the seller’s Washington filing or B&O responsibilities. If you meet a registration requirement, you may need to file Washington excise tax returns and report B&O tax even when the facilitator collected retail sales tax from customers. Washington’s B&O tax is a separate tax on business activity, so a seller can owe B&O tax in a situation where no retail sales tax is due.
If all your retail sales are through a facilitator, the Department says you do not need to collect and submit retail sales tax on those sales when you have proof that the facilitator is doing so on your behalf. Keep that proof. You may still need to report gross sales and claim the appropriate sales-tax deduction on your return, while reporting B&O tax on the applicable gross proceeds. Do not subtract marketplace commissions from gross sales unless a specific rule allows it.
How marketplace sales tax is collected and reported
The facilitator collects the applicable retail sales tax from the customer on taxable facilitated sales and reports and remits it to the Department of Revenue. Facilitators report through My DOR. The Department’s instructions direct facilitators to report gross Washington retail sales under Retailing B&O, deduct marketplace sellers’ Washington sales using the specified “Other” deduction and “Third-Party Sales” explanation, and report the facilitated sales under State Sales and Use and by location on the Local Sales page.
A seller’s return is a separate matter. A registered seller may need to report gross sales and use the Department’s designated deduction for sales tax collected by a facilitator, while still reporting applicable B&O. The Department’s marketplace-seller filing example explains how to report sales when a facilitator collected tax. Reconcile your return to facilitator statements and transaction-level records; do not treat the facilitator’s tax remittance as proof that your own filing obligations are complete.
B&O tax obligations for marketplace sellers
Marketplace sellers can owe Washington B&O tax on retail sales even when a facilitator collects the retail sales tax. The Department identifies retailing B&O as applicable to sellers’ gross proceeds from retail sales, including sales made through a facilitator. The facilitator’s commission or other fee generally does not reduce the seller’s gross selling price for this purpose.
Whether you must register and what B&O classification or deductions apply depend on your activities, nexus, and receipts. The remote-seller registration threshold described by the Department is based on combined Washington gross receipts, while physical presence can independently require registration. Because B&O is distinct from sales tax, a sale that is exempt from retail sales tax may still need to be considered in your B&O reporting. Confirm the treatment of your particular products and income with the Department or have a compliance professional review it.
Filing deadlines, records, and facilitator sales reports
Washington assigns filing frequencies and due dates through the Department of Revenue; the applicable schedule can depend on the account and the Department’s instructions. Use the filing frequency and due date shown for your account in My DOR, and check the Department’s current calendar rather than relying on a general date. File and pay by the assigned deadline even when a return has no tax due, if a return is required.
Keep records that let you substantiate gross sales, Washington sourcing, tax collected, facilitator-collected sales, deductions, exemptions, and B&O calculations. Useful records include marketplace settlement statements, transaction and order details, invoices, customer and delivery information, exemption certificates or other exemption evidence, and proof of tax collection by the facilitator. Washington’s cited marketplace guidance does not establish a general requirement that every facilitator provide sellers a particular sales-report format. Ask each facilitator for usable transaction and tax records, and retain what you receive.
Exempt sales, delivery charges, and other taxable amounts
A sale that qualifies for a Washington retail sales tax exemption may be excluded from retail sales tax, but the seller should retain the documentation required to support the exemption. The exact evidence depends on the exemption and transaction. Do not treat a customer’s statement or a marketplace label as sufficient without checking the applicable Department requirements. Exempt sales may still count toward the remote-seller receipts threshold and may have B&O consequences.
Washington generally treats seller-billed delivery charges as part of the selling price when the underlying product is subject to retail sales tax, whether the charge is separately stated or included in the invoice. If the goods are exempt, the delivery charge is generally exempt from retail sales tax as well. For a single delivery charge covering taxable and nontaxable goods, the Department describes allocation methods based on the taxable goods’ share of total sales price or weight. Wholesale delivery charges are not subject to retail sales tax, though they may be included in B&O gross income. Other fees can have different treatment; check the Department’s delivery-charge guidance for the transaction.
Penalties and liability for missed obligations
Failing to register, collect or report tax when required can leave a business with unpaid tax, interest, and possible penalties under Washington law. A facilitator’s collection responsibility does not erase a seller’s separate registration, return, B&O, or recordkeeping obligations. Likewise, a seller should not assume that a facilitator collected tax unless its records or agreement confirm that it did.
The amount and consequences depend on the facts, the tax involved, and the Department’s current rules. If you discover a missed registration or return, review the account and transaction history promptly and contact the Washington Department of Revenue about the appropriate correction. Sales Tax Compliance USA can help assess the exposure and prepare a practical compliance plan, but no provider can promise a particular audit or penalty outcome.
Washington treatment of common marketplace transactions and related charges; confirm the specific product, exemption, and reporting facts.
| Transaction or amount | Washington sales-tax treatment | Seller’s related compliance point |
|---|---|---|
| Taxable retail product sold through a marketplace | Facilitator generally collects and remits applicable retail sales tax on the facilitated sale. | Seller may still have registration, return, and retailing B&O obligations; retain proof of facilitator collection. |
| Retail sale exempt from sales tax | Retail sales tax is not due if the transaction qualifies for the exemption. | Keep the required exemption documentation; exempt receipts can still count toward the remote-seller threshold and may affect B&O. |
| Seller delivery charge for a taxable product | Generally included in the taxable selling price, whether separately stated or not. | Include the charge in the tax calculation and retain the invoice or transaction detail. |
| Seller delivery charge for exempt goods | Generally exempt from retail sales tax when the underlying sale is exempt. | Document the underlying exemption and the related delivery charge. |
| One delivery charge for taxable and nontaxable goods | Tax applies to the allocable portion; the Department describes allocation by sales price or weight. | Keep the calculation and shipment records supporting the allocation. |
| Wholesale sale and delivery charge | Wholesale delivery charge is not subject to retail sales tax. | The charge may be included in gross income subject to B&O under the wholesaling classification. |
Frequently asked questions
What is a marketplace facilitator in Washington?
It is a business that contracts with sellers for consideration to facilitate sales through a marketplace, communicates the offer or acceptance between buyer and seller, and performs at least one specified function such as payment processing, fulfillment or storage, or setting prices. Merely advertising products does not meet the definition by itself. The statutory definition is in RCW 82.08.010(15).
Do marketplace facilitators have to collect Washington sales tax?
Generally, a facilitator making Washington consumer sales, including sales for marketplace sellers, must register and collect and remit applicable retail sales tax on taxable facilitated retail sales. Exempt transactions are not made taxable merely because they occur through a marketplace. Sellers should verify collection for their transactions and keep evidence.
What is the Washington sales-tax economic nexus threshold?
For a remote marketplace seller without physical presence, the Department of Revenue’s marketplace-seller guidance states a threshold of more than $100,000 in combined gross receipts sourced or attributed to Washington in the current or prior year, or organization or commercial domicile in Washington. The calculation includes exempt sales and sales through marketplaces, as well as other Washington income. Physical presence can require registration regardless of the economic threshold.
Are marketplace sellers still responsible for Washington B&O tax?
Yes, a seller may owe Washington B&O tax on marketplace sales even when the facilitator collects retail sales tax. B&O is separate from sales tax and is generally based on the seller’s applicable gross proceeds or income. Registration and reporting depend on nexus, receipts, and the seller’s activities.
Does a marketplace facilitator have to provide sales reports to sellers?
The Department’s marketplace guidance explains facilitator tax collection and reporting but does not establish a general requirement for a particular seller-facing report format. Sellers should request transaction, settlement, and tax-collection records from the facilitator and retain them to support returns and deductions.
What sales are subject to Washington marketplace-facilitator rules?
The rules apply to taxable retail sales made through a qualifying marketplace, including the facilitator’s own sales and sales it facilitates for third-party sellers. Whether a particular product or transaction is taxable depends on Washington’s product, transaction, and exemption rules. A marketplace sale is not automatically taxable simply because it is made online.
Are delivery charges taxable in Washington?
Seller delivery charges are generally part of the selling price and subject to retail sales tax when the underlying product is taxable, even if separately stated. Charges associated with exempt goods are generally exempt, and a single charge for taxable and nontaxable goods may need to be allocated. The Department’s delivery-charge guidance describes allocation methods and other details.
How do marketplace facilitators report sales tax in Washington?
Facilitators report through My DOR. The Department instructs them to report gross Washington retail sales under Retailing B&O, use the specified deduction and “Third-Party Sales” explanation for marketplace sellers’ sales, and report sales under State Sales and Use and by location on the Local Sales page. Sellers may have separate return and B&O reporting duties.
How we handle this for you
The mechanics in Washington are manageable on their own; the cost is the time it takes every single filing period, in every state you are registered in. We are a managed service: our team registers you with the Washington Department of Revenue, prepares and files your returns, and keeps you compliant period after period. You get one point of contact and one invoice — you do not get another dashboard to learn.
See our sales tax compliance services, check where you have obligations with the nexus calculator, or talk to us about Washington.
Official sources
- https://dor.wa.gov/taxes-rates/retail-sales-tax/marketplace-fairness-leveling-playing-field/marketplace-facilitators
- https://dor.wa.gov/taxes-rates/retail-sales-tax/marketplace-fairness-leveling-playing-field/marketplace-sellers
- https://dor.wa.gov/taxes-rates/retail-sales-tax/marketplace-fairness-leveling-playing-field/tax-filing-example
- https://dor.wa.gov/forms-publications/publications-subject/tax-topics/delivery-charges
- https://dor.wa.gov/taxes-rates/tax-incentives/deductions
- https://app.leg.wa.gov/RCW/default.aspx?cite=82.08.010
Reviewed by Paul le Roux, CA(SA). Sales Tax Compliance USA handles US sales tax registration, filing and remittance for cross-border and domestic ecommerce sellers as a fully managed service.
This page is general information for educational purposes and does not constitute legal or tax advice. Sales tax rules change and depend on your specific facts. Consult a qualified tax professional about your own position.