Foreign sellers may have to register with the Washington Department of Revenue, collect Washington retail sales tax on taxable sales, and report Washington Business & Occupation (B&O) tax. For remote sellers, the Department’s current economic-nexus test is more than $100,000 in combined gross receipts sourced or attributed to Washington in the current or prior calendar year, or being organized or commercially domiciled in Washington. Physical presence can also require registration. The threshold includes marketplace and direct sales, and exempt sales count toward the threshold.
Marketplace collection does not necessarily remove your other Washington responsibilities. A marketplace facilitator may collect and remit sales tax on sales it facilitates, but you may still need to register and file returns, report those sales for B&O purposes, and collect tax on your direct sales. Washington is not a home-rule state, but local rates vary. The Department of Revenue administers registration through My DOR and provides the official rate lookup.
When foreign sellers must collect Washington sales tax
A seller based outside the United States is not automatically exempt from Washington tax rules. If you have physical presence in Washington, the Department of Revenue says you must register even if you do not meet the economic threshold. Inventory, employees, or other business activities in the state can affect whether you have physical presence; if your arrangements are unclear, confirm the facts with the Department or have a compliance professional review them.
Without physical presence, a remote seller generally must register when it has more than $100,000 in combined gross receipts sourced or attributed to Washington in the current or prior year, or is organized or commercially domiciled in Washington. The calculation includes Washington income from retail, wholesale, services, and other activities, and includes exempt sales. Once the threshold is met, the Department says the seller must collect and report for the remainder of that calendar year and the following calendar year.
Registration and collection are related but distinct questions. A seller whose sales are all made through a facilitator that collects and remits the tax may not need to collect and submit retail sales tax itself on those facilitated transactions, but it can still have registration, return, B&O, or other tax obligations.
How marketplace sales affect your obligations
Washington requires marketplace facilitators that meet the state’s requirements to collect and remit applicable retail sales tax on facilitated sales. If a facilitator collects tax on your behalf, keep its sales reports and evidence of collection. The Department says facilitators must provide sellers access to information about gross Washington sales made on their behalf during the previous month, by the 15th day after that month ends.
Marketplace sales still matter to your nexus calculation: include all Washington retail sales, whether made through a facilitator, your own website, or another channel. If you meet a registration threshold, you may need to file and report gross Washington retail sales for B&O purposes while taking the appropriate sales-tax deduction for sales on which the facilitator collected and remitted tax. Do not treat marketplace collection as proof that all your Washington filing obligations have been handled.
Reconcile facilitator reports against your own order records, refunds, and direct sales. The correct reporting treatment depends on what the facilitator collected and the nature of each transaction; retain records that support any deduction claimed.
How to register through My DOR
Washington registration is handled through the Department of Revenue’s My DOR system. Start by applying for a Washington business license and providing accurate information about your legal entity, business activities, owners, locations, and expected Washington sales. The Department uses the application to establish the relevant tax accounts and filing requirements.
Before applying, identify whether you sell directly, through marketplaces, or both; whether you have Washington inventory or other physical presence; and which kinds of products or services you sell. These details can affect registration and tax classifications. Foreign businesses should use their actual legal and contact information and check the Department’s current instructions for any documentation or identification requirements that apply to their entity.
After registration, use My DOR to file returns, report deductions, and pay amounts due. Keep your account information current and review the filing frequency and due dates assigned by the Department. If you are unsure whether you must register, ask the Washington Department of Revenue or have a service provider assess your facts before deciding to delay.
When foreign sellers may owe Washington B&O tax
Washington is unusual because it imposes B&O tax alongside retail sales tax. B&O is generally measured on gross business income or gross proceeds under the applicable classification, rather than being a tax on the customer’s purchase. As a result, a seller can owe Washington B&O tax even when no retail sales tax is due on a particular sale.
Remote sellers can have B&O responsibilities when they meet Washington’s nexus requirements. The Department’s remote-seller threshold is more than $100,000 in combined Washington gross receipts in the current or prior year, and the calculation includes income from multiple business activities, not just taxable retail sales. Physical presence or Washington organization or commercial domicile can also create obligations.
Marketplace sellers should not assume the facilitator pays their B&O tax. The Department instructs sellers who meet a registration threshold to report gross Washington retail sales under the Retailing B&O classification, including facilitated sales, and to claim the appropriate deduction for facilitated sales on the sales-tax side. The correct B&O classification and any available deductions depend on your activity; confirm them with the Department or a qualified adviser.
How to determine the correct Washington sales tax rate
Washington’s retail sales tax rate combines the state rate with applicable local rates, so the amount can vary by the delivery location. Washington is not a home-rule state: local jurisdictions do not independently administer their own sales tax systems. The Department of Revenue administers the tax and provides a sales-tax rate lookup for determining the rate associated with a location.
For shipped orders, use the destination and delivery details required by Washington’s sourcing rules, rather than applying one statewide rate to every customer. Check the Department’s current rate lookup for the address and transaction date, and retain the location information used to calculate the tax. Rates can change, so do not rely indefinitely on a saved rate table or a rate from a prior order.
If an address is incomplete, a product’s tax treatment is uncertain, or a transaction involves unusual delivery or fulfillment arrangements, confirm the correct treatment with the Department of Revenue. A compliance service can also review your product and order data and help apply the appropriate rate consistently.
Which sales are taxable and what exemptions apply
Washington generally applies retail sales tax to retail sales of tangible personal property and to certain services. Whether a sale is taxable depends on what you sell, how the transaction is structured, and whether a specific exemption applies. Do not assume that a sale is exempt merely because the buyer is outside Washington, the seller is foreign, or the order was placed through a marketplace.
Some transactions may qualify for an exemption or deduction, but the seller may need to obtain and retain documentation supporting it. Marketplace sales for which the facilitator collected and remitted Washington sales tax may be reported with the applicable deduction, while the seller may still have B&O reporting obligations. Exempt sales also count when calculating the remote-seller economic-nexus threshold.
Classify products and services individually and keep invoices, exemption documentation, shipping records, and marketplace statements. Washington’s rules can distinguish between products or services that appear similar. When the taxability of a specific item or transaction is not clear, check the Department’s guidance or ask for a review rather than guessing.
Washington filing and payment deadlines
The Department of Revenue assigns a filing frequency based on estimated business activity and tax circumstances. Washington returns may be monthly, quarterly, or annual. Check the filing frequency shown in My DOR and follow the due date for each assigned period; do not assume that a foreign seller or a marketplace-only seller has no return to file.
For monthly filers, returns are due on the 25th of the following month. Quarterly returns are due at the end of the month following the quarter, and annual returns are due April 15. If a due date falls on a weekend or legal holiday, the Department extends it to the next business day. Confirm the current due date and your assigned frequency in My DOR, especially if your account or filing status has changed.
File and pay through My DOR, including a return when required even if there is no tax due. Reconcile direct sales, marketplace sales, deductions, and B&O classifications before filing. A return that omits marketplace or exempt sales from the nexus calculation can lead to an incorrect conclusion about whether registration or reporting is required.
Missed filings, penalties, and voluntary disclosure
If you discover missed Washington returns or unreported tax, review your registration status, sales records, marketplace reports, and tax collected before contacting the Department. Do not ignore a filing notice or assume that a marketplace has corrected your account. The Department’s general Voluntary Disclosure Program may limit the lookback period for eligible businesses and may waive some penalties, while interest is imposed at the statutory rate. Eligibility conditions apply, and collected but unremitted sales tax can receive different treatment.
Washington also offers an International Remote Seller Voluntary Disclosure Program for qualifying businesses headquartered outside the United States. The Department’s current program page describes a temporary application window from February 1 through May 31, 2026, and eligibility conditions including being unregistered, having substantial nexus, and meeting other program requirements. The program describes a limited lookback for uncollected retail sales tax and a separate B&O lookback. Check the Department’s current program page before applying because the window and conditions are specific.
Voluntary disclosure is not automatic amnesty. Eligibility depends on your history, contact with the Department, business location, and reporting conduct. If you may qualify, review the official requirements before registering or filing late returns, since the order and timing of steps can matter. A compliance service can help organize records and assess the application, but the Department determines eligibility and treatment.
Get help managing Washington compliance
Washington compliance can involve sales-tax collection, B&O classifications, marketplace deductions, local rate sourcing, and recurring returns. Sales Tax Compliance USA is a done-for-you service staffed by people, not tax software. We can review your sales channels and Washington activity, help determine whether registration is needed, support My DOR registration, and manage filings and payment coordination based on your records.
For a useful review, gather your Washington order history, marketplace statements, product and service descriptions, shipping destinations, exemption documents, and any prior Department correspondence. We can help identify questions that need confirmation from the Washington Department of Revenue and explain the next steps. The right answer depends on your business facts, and no service can guarantee that a tax authority will not examine a return.
Not sure how this applies to your business? We handle US sales tax registration, filing and remittance for ecommerce sellers as a fully managed service, for one fee. Book a free consultation and we will review your own position with you.
Washington filing frequency and due-date framework; confirm the frequency assigned to your account in My DOR.
| Filing frequency | Typical due date | What to check |
|---|---|---|
| Monthly | 25th of the following month | File and pay for each assigned monthly period; verify the period and due date in My DOR. |
| Quarterly | Last day of the month following the quarter | Reconcile direct and marketplace sales for the full quarter and report required B&O activity. |
| Annual | April 15 | Confirm that annual filing is the frequency assigned to your account and include all required tax classifications. |
Frequently asked questions
Do foreign sellers have to collect Washington sales tax?
They may. A foreign remote seller generally must register and collect tax on taxable direct sales if it meets Washington’s economic-nexus test: more than $100,000 in combined Washington gross receipts in the current or prior year, or if it is organized or commercially domiciled in Washington. Physical presence can require registration regardless of the economic threshold. Marketplace-facilitated sales may be collected by the facilitator, but that does not necessarily remove the seller’s registration, filing, or B&O obligations.
What is Washington’s economic nexus threshold for remote sellers?
The Washington Department of Revenue states that a remote seller meets the threshold with more than $100,000 in combined gross receipts sourced or attributed to Washington in the current or prior year. The calculation includes retail, wholesale, service, and other Washington income, and includes exempt sales. Once the threshold is met, the seller must collect and report for the remainder of that calendar year and the following calendar year.
Does Washington require foreign sellers to register for B&O tax?
A foreign seller may need to register and report B&O tax if it has Washington nexus, including by meeting the remote-seller threshold or having physical presence, or if it is organized or commercially domiciled in Washington. B&O is separate from retail sales tax, so a seller can owe B&O even when no sales tax is due on a particular sale. The applicable classification and reporting depend on the seller’s activities.
Do marketplace facilitators collect Washington sales tax for sellers?
Washington requires qualifying marketplace facilitators to collect and remit applicable sales tax on facilitated sales. If the facilitator collects and pays the tax on your behalf, you generally do not collect and submit sales tax again on those same transactions. You may still need to register, file returns, report facilitated sales for B&O purposes, and collect tax on direct sales.
How do I register to collect sales tax in Washington?
Apply for a Washington business license through the Department of Revenue’s My DOR system and provide accurate information about your entity, activities, and Washington business. The Department establishes the relevant tax accounts and filing requirements from your application. Review your assigned filing frequency and account details in My DOR, and confirm any foreign-entity documentation requirements with the Department.
What sales tax rate should a remote seller charge in Washington?
Washington’s rate includes state and applicable local components and varies by location. Use the Washington Department of Revenue’s current sales-tax rate lookup for the delivery address and transaction date, applying the state’s sourcing rules. Do not use one statewide rate for every order or rely on an old rate table.
Does the $100,000 threshold include marketplace sales?
Yes. The Department says to include all Washington retail sales, including sales through a marketplace facilitator, your own website, or other channels. Exempt sales also count toward the threshold, and the broader calculation includes Washington receipts from other business activities.
Can foreign sellers use Washington’s voluntary disclosure program?
Some can. Washington has a general Voluntary Disclosure Program and a separate International Remote Seller Voluntary Disclosure Program for qualifying businesses headquartered outside the United States. The international program page currently describes a temporary application window from February 1 through May 31, 2026, with eligibility conditions and limited lookback treatment; check the Department’s current requirements before applying. The Department determines eligibility, and collected but unremitted sales tax may be treated differently.
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-sellers
- https://dor.wa.gov/taxes-rates/retail-sales-tax/marketplace-fairness-leveling-playing-field/marketplace-facilitators
- https://dor.wa.gov/open-business/apply-business-license/plan-taxes
- https://dor.wa.gov/file-pay-taxes/filing-frequencies-due-dates
- https://dor.wa.gov/taxes-rates/tax-incentives/deductions
- https://dor.wa.gov/open-business/apply-business-license/voluntary-disclosure-program
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.
Related guides
Other Washington guides: Amazon FBA · Audit defence · Back sales tax · Economic nexus · Filing · Permit
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