Amazon generally collects and remits Washington retail sales tax on sales it facilitates through its marketplace. That does not necessarily take care of your Washington obligations: depending on your nexus and registration status, you may still need to register, file Washington excise tax returns, report Business & Occupation (B&O) tax, and pay any tax due. Washington is distinctive because B&O tax can apply even when no retail sales tax is due.
The Washington Department of Revenue administers state tax registration through My DOR. For Amazon FBA sellers, inventory stored in Washington can create physical presence nexus, while remote sellers without physical presence may have nexus when their Washington receipts exceed the state’s threshold. The details depend on your business and sales channels, so check your position before assuming Amazon has handled everything.
What Amazon collects—and what remains your responsibility
For sales Amazon facilitates to Washington customers, Amazon generally collects and remits the applicable retail sales tax as the marketplace facilitator. If all your retail sales are through a marketplace facilitator and you have proof that the facilitator is collecting and remitting the tax on your behalf, the Washington Department of Revenue says you do not need to collect and submit retail sales tax on those facilitated sales yourself.
Marketplace collection does not automatically settle your own Washington tax account. If you meet a registration threshold, you may still need to register and file returns, report your Washington business income for B&O tax, and report other taxable activity. Direct sales through your own website or other channels remain your responsibility, including determining whether you must collect sales tax on them.
When your Amazon FBA business has Washington nexus
Washington nexus can arise from physical presence or from the state’s economic nexus rules. Physical presence can include property or inventory in Washington. If Amazon stores your FBA inventory in a Washington warehouse, that inventory can create physical presence nexus even if you do not own or operate the warehouse yourself. Amazon’s inventory placement can change, so review your inventory records and confirm your circumstances with the Washington Department of Revenue.
A seller without physical presence may still have nexus if it meets Washington’s remote-seller receipts threshold. Nexus can bring B&O reporting and registration obligations even when Amazon collects sales tax on marketplace orders. Do not treat marketplace collection as proof that you have no nexus or no filing requirement.
Washington’s sales-tax thresholds for remote sellers
For a remote marketplace seller without physical presence, the Washington Department of Revenue requires registration to report B&O tax and collect and submit applicable sales tax if 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 test includes Washington income from all activities, not just Amazon retail sales, and includes exempt sales when calculating the threshold.
Count Washington sales made through Amazon together with sales through your own site and other channels. Once the threshold is met, the Department’s marketplace-seller guidance says the seller must collect and report for the remainder of the current calendar year and the following calendar year. If you are unsure whether your receipts, physical presence, or business structure meets a test, ask the Department or have a compliance professional review the facts.
How FBA inventory can create Washington tax obligations
Inventory physically located in Washington can establish physical presence nexus. That can mean Washington registration and B&O reporting obligations even if your business is based elsewhere and Amazon handles sales tax on marketplace orders. FBA inventory is not a reason to assume that Amazon has registered or filed on your behalf as the seller.
Keep records of where your inventory is stored and when it is moved, along with marketplace sales reports and records of direct sales. If you discover Washington inventory after the fact, the right steps can depend on when it was present, your sales, and your account status. Confirm the applicable reporting period and any required correction with the Washington Department of Revenue.
When and how to register your business in Washington
If you have Washington nexus and meet a registration requirement, register with the Washington Department of Revenue through My DOR. Registration is generally relevant when you have physical presence, meet the remote-seller threshold, or otherwise conduct business that requires a Washington tax account. A Washington business license and a Department of Revenue tax account are connected parts of state business registration; whether you need additional state or local licenses depends on your activities and location.
After registration, the Department assigns a filing frequency and makes returns available through your account. Gather your legal business details, Washington sales and income information, inventory records, and marketplace documentation before registering. If you are uncertain whether your facts require registration, confirm with the Department rather than relying on Amazon’s collection of customer sales tax.
How to report Amazon marketplace sales on Washington returns
If you meet a registration threshold, Washington’s marketplace-seller instructions say to report gross Washington retail sales, including marketplace and direct sales, under Retailing B&O. Report gross Washington retail sales on the State Sales and Use section of the excise tax return, then claim the deduction for sales collected by a facilitator for the facilitated sales. The Department identifies the online deduction as “Gross Sales Collected by Facilitator.”
Use Amazon’s Washington sales information to reconcile marketplace transactions, and retain evidence that Amazon collected and remitted the tax. Do not simply omit marketplace sales from the return: the Department instructs marketplace sellers to report gross sales and take the facilitator deduction. Report direct sales separately as needed and determine their sales-tax treatment based on the transaction and your obligations.
Washington sales tax filing deadlines and payment
Washington assigns businesses a monthly, quarterly, or annual filing frequency. Monthly returns are due on the 25th of the following month, quarterly returns are due on the last day 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 due date moves to the next business day.
File and pay through My DOR according to the frequency assigned to your account. A return may still be required for a period with no activity or no tax due, unless the Department has placed your account in a status that removes the filing requirement. Check your account notices and current Department instructions for your assigned frequency and payment details.
How Washington B&O tax applies to Amazon sellers
B&O tax is a Washington business tax measured on gross income or gross proceeds, rather than a tax on the customer’s purchase in the same way as retail sales tax. Washington’s marketplace-seller guidance says sellers who meet a registration threshold still file and pay B&O and other applicable taxes even when the marketplace facilitator collects retail sales tax. This is why a seller can owe B&O tax when no sales tax is due from the seller on a facilitated transaction.
For reporting, the Department instructs marketplace sellers to report gross Washington retail sales under Retailing B&O. The tax treatment and any available deductions can depend on the seller’s activities, nexus, and transaction details. Review all Washington income, not only Amazon sales, and confirm the correct classification and deductions with the Department or a qualified tax professional.
Penalties for late or missing Washington tax returns
Late filing or payment can result in penalties and interest. The Washington Department of Revenue’s business tax materials describe late-filing penalties that increase with the length of the delay; the amount that applies depends on the return and timing. A missed return can create a problem even when you believe no tax is due, because registered businesses generally must file returns on their assigned schedule.
If you have missed a filing or think a return is incomplete, review your My DOR account and contact the Department promptly about filing or correcting it. Do not assume that Amazon’s collection of sales tax removes a return requirement or resolves B&O reporting. The exact amount due depends on your account and circumstances, so verify it with the Department.
Get help with Washington registration, filings, and payments
Sales Tax Compliance USA is a done-for-you service staffed by people for ecommerce and cross-border sellers. We can help review your Washington nexus facts, including FBA inventory and sales across channels, and assist with registration, return preparation, and payment coordination.
Washington obligations depend on your inventory locations, business structure, receipts, and account status. We can help you organize the records and check the applicable requirements with the Washington Department of Revenue, so you can make informed decisions rather than assuming marketplace collection covers every tax obligation.
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 Amazon seller obligations by activity and tax treatment
| Activity or tax | Washington treatment for an Amazon seller |
|---|---|
| Amazon-facilitated retail sale to a Washington customer | Amazon generally collects and remits retail sales tax; the seller may still need to report gross sales and claim the facilitator deduction on a required return. |
| Direct retail sale to a Washington customer | The seller must determine whether it has an obligation to collect and remit retail sales tax; marketplace collection does not cover the seller’s separate direct channel. |
| Washington FBA inventory | Inventory in the state can create physical presence nexus and may trigger registration and B&O reporting obligations. |
| Washington B&O tax | Can apply to Washington business income even when the seller does not collect retail sales tax on a facilitated sale. |
| Registered account with no tax due for a period | A return may still be required on the assigned schedule; check My DOR and any active non-reporting status. |
| Remote seller without physical presence | The Department’s threshold test requires more than $100,000 in Washington gross receipts, or that the business be organized or commercially domiciled in Washington; receipts counted toward the threshold include Washington-attributed business income, including exempt sales and, for marketplace facilitators, marketplace sales. |
Frequently asked questions
Does Amazon collect Washington sales tax for FBA sellers?
Amazon generally collects and remits Washington retail sales tax on sales it facilitates as a marketplace facilitator. That does not cover your separate direct sales or necessarily remove your Washington registration, return, or B&O obligations. Keep evidence of marketplace collection and check your own nexus and filing requirements.
Do Amazon FBA sellers need to register for a Washington business license?
You may need to register with the Washington Department of Revenue through My DOR if you have Washington nexus and meet a registration requirement, including through Washington inventory or the remote-seller threshold. Amazon’s collection of sales tax does not itself register your business or settle B&O reporting. Confirm whether your specific activities require a Washington business license or tax account with the Department.
Do Amazon sellers have to pay Washington B&O tax?
A seller with Washington nexus and taxable Washington business activity may owe B&O tax, which is measured on gross income or gross proceeds. The Department says marketplace sellers who meet a registration threshold still report and pay B&O even when a facilitator collects retail sales tax. The amount and classification depend on the seller’s activities.
Does storing inventory in an Amazon warehouse create sales-tax nexus in Washington?
Inventory physically located in Washington can create physical presence nexus, including inventory held in a fulfillment warehouse. That can trigger registration and reporting obligations even if Amazon collects sales tax on marketplace orders. Check where your inventory is stored and confirm the consequences for your account with the Washington Department of Revenue.
Do I need to file a Washington tax return if I only sell through Amazon?
Possibly. If you meet a Washington registration threshold, you may need to file an excise tax return and report B&O tax even if all retail sales are through Amazon and Amazon collects the sales tax. The Department instructs marketplace sellers to report gross sales and claim the facilitator deduction; check your My DOR filing status.
Are Amazon FBA sales subject to Washington sales tax?
Retail sales to Washington customers are generally subject to Washington retail sales tax unless an exemption or other specific rule applies. For sales Amazon facilitates, Amazon generally collects and remits the tax. Your own direct sales and any other taxable activity still need to be evaluated separately.
What are Washington’s sales-tax nexus thresholds for remote sellers?
For remote marketplace sellers without physical presence, the Department’s current guidance requires registration if combined gross receipts sourced or attributed to Washington exceed $100,000, or if the seller is organized or commercially domiciled in Washington. The receipts calculation includes all Washington income and exempt sales, including marketplace and direct sales. Physical presence, such as Washington inventory, is a separate nexus basis.
How do I report marketplace sales on a Washington tax return?
If you are required to file, report gross Washington retail sales, including marketplace and direct sales, under Retailing B&O and on the State Sales and Use section. Then claim the “Gross Sales Collected by Facilitator” deduction for sales on which the marketplace facilitator collected and remitted retail sales tax. Keep marketplace reports and proof of collection to support the return.
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/file-pay-taxes/filing-frequencies-due-dates
- https://dor.wa.gov/file-pay-taxes/filing-frequencies-due-dates/active-non-reporting
- https://dor.wa.gov/sites/default/files/2024-12/BusinessTaxBasics.pdf
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: Economic nexus · Filing · Permit · Registration
Selling into several states? Check where you have crossed a threshold with the free nexus diagnostic, see the full 51-state threshold table, or browse every state guide.