Sales and use tax imposition
Washington imposes a 6.5 percent state sales tax on each retail sale of tangible personal property, digital goods, digital codes, digital automated services, and certain enumerated services unless specifically excluded from the statutory definition of retail sale. The tax applies to the selling price of retail sales occurring in Washington. Washington also imposes a complementary use tax at the same rate on the privilege of using tangible personal property, digital goods, digital codes, and taxable services within the state when sales tax has not been paid. The use tax rate equals the retail sales tax rate in effect under RCW 82.08.020, and it applies to the value or purchase price of the article or service used by the taxpayer.
Local jurisdictions may impose additional sales and use taxes on top of the state rate; total combined state and local rates vary by location.
Source: RCW 82.08.020; RCW 82.12.020
Economic nexus threshold for remote sellers
Starting January 1, 2020, remote sellers without physical presence in Washington must register to collect and remit sales tax if they have more than $100,000 in combined gross receipts sourced or attributed to Washington in the current or prior calendar year. The threshold applies to all Washington income, including retail sales, wholesale sales, service income, and other apportionable activities. Sales made through marketplace facilitators are included in the threshold calculation, even though the facilitator may collect tax on those sales.
Washington originally adopted economic nexus effective October 1, 2018, with both a $100,000 sales threshold and a 200-transaction threshold. The transaction count threshold was eliminated effective March 14, 2019, leaving only the gross receipts test.
When a remote seller exceeds the $100,000 threshold during the current calendar year, the seller must begin collecting sales tax on the first day of the month that starts at least 30 days after crossing the threshold. A seller who met the threshold in the prior calendar year must collect tax for the entirety of the current calendar year.
Source: RCW 82.04.067; Washington DOR, Out of state businesses reporting thresholds and nexus
Marketplace facilitator collection obligation
Beginning October 1, 2018, marketplace facilitators subject to a tax collection obligation under RCW 82.08.052 must collect and remit retail sales tax on all taxable retail sales made or facilitated by the marketplace facilitator, whether in its own right or as an agent of a marketplace seller, regardless of whether the marketplace seller has a tax collection obligation. For facilitators, receipts counting toward the RCW 82.08.052 threshold include both the facilitator's own sales and the cumulative gross proceeds from sales by all marketplace sellers through the facilitator's marketplace.
Source: RCW 82.08.0531(2); RCW 82.08.052(1)(d)(i)
Marketplace facilitator nexus threshold
From October 1, 2018 through December 31, 2019, a marketplace facilitator had a collection obligation if it had more than $100,000 in cumulative gross receipts from Washington or 200 or more separate transactions for delivery into Washington in the current or prior calendar year. For threshold purposes, the facilitator's receipts and transactions include both its own direct sales and the cumulative gross proceeds and transactions from all marketplace sellers selling through its marketplace, regardless of whether those sellers themselves have nexus. The transaction-count threshold was eliminated effective March 14, 2019. Beginning January 1, 2020, marketplace facilitators meet the threshold if they have more than $100,000 in gross receipts attributed to Washington under RCW 82.04.067.
Source: RCW 82.08.052(1)(a) and (d); RCW 82.04.067
Filing frequency and due dates
Washington sales and use tax returns are generally due monthly within 25 days after the end of the month in which taxable activities occur. The Department of Revenue may assign taxpayers to quarterly or annual filing frequencies. Quarterly returns and payments are due on or before the last day of the month following the reporting period. Annual returns and payments are due on or before April 15 of the year immediately following the period covered by the return.
Source: RCW 82.32.045; WAC 458-20-228
Resale certificate requirements and timing
Washington sellers must obtain proper resale documentation from buyers to substantiate that a sale is a wholesale sale rather than a retail sale. The burden of proving a sale is wholesale falls on the seller under RCW 82.04.470(1). A seller may meet this burden by taking from the buyer, at the time of sale or within a reasonable time after the sale, a copy of a reseller permit issued by the Washington Department of Revenue under RCW 82.32.780 or 82.32.783. In lieu of a reseller permit, sellers may accept properly completed exemption certificates authorized by the department, including uniform exemption certificates approved by the Streamlined Sales and Use Tax Agreement governing board or the Multistate Tax Commission's uniform sales and use tax exemption certificate.
Required information on resale certificates
All resale certificates must satisfy the information requirements of RCW 82.04.470. Under WAC 458-20-102A(2)(b), every resale certificate must contain:
- The name and address of the buyer
- The uniform business identifier or tax registration number of the buyer (if the buyer is required to be registered with the department)
- The type of business engaged in
- The categories of items or services to be purchased for resale or that are exempt (unless the buyer's business classification allows a blanket resale certificate as provided by department rule)
- The date on which the certificate was provided
- A statement that the items or services are either purchased for resale in the regular course of business or exempt from tax pursuant to statute
- An acknowledgment that the buyer is solely responsible for payment of sales or use tax if the property is used rather than resold
Farmers not required to be registered with the department may provide resale certificates with the registration number information omitted, provided the balance of the certificate is completed in full.
Timing requirements
The seller should obtain the resale certificate at the time of sale or within a reasonable time after the sale. If the resale certificate is obtained more than 120 days after the sale or sales in question, WAC 458-20-102A requires that the resale certificate must be specific to the sale or sales. The certificate must specifically identify the sales in question on its face, or be accompanied by other documentation signed by the buyer specifically identifying the sales and stating that the provisions of the accompanying resale certificate apply. A nonspecific resale certificate obtained more than 120 days after the sale is generally not, in and of itself, acceptable proof of the wholesale nature of the sale. The resale certificate and any required documentation must be obtained within the statutory time limitations provided by RCW 82.32.050 (generally four years from the last day of the tax period).
Dual-purpose purchases
If a buyer is normally engaged in both consuming and reselling certain types of personal property and cannot determine at the time of purchase whether the particular property will be consumed or resold, the buyer may use a reseller permit for the entire purchase if the buyer principally resells the property according to the general nature of the buyer's business. The buyer must account for the value of any articles purchased with a reseller permit that is actually used by the buyer and remit the deferred sales tax on that property to the department. This rule applies only if the buyer principally resells; if the buyer principally consumes the articles in question, the buyer should not give a resale certificate for any part of the purchase.
Penalties for misuse
Any person who uses a resale certificate to purchase items or services without payment of sales tax and who is not entitled to use the certificate for that purchase is assessed a penalty of 50 percent of the tax due, in addition to all other taxes, penalties, and interest due, on the improperly purchased item or service under RCW 82.32.291. The department may waive the penalty if it finds that the use of the certificate was due to circumstances beyond the taxpayer's control or if the certificate was properly used for purchases for dual purposes.
Source: RCW 82.04.470; WAC 458-20-102A; RCW 82.08.130; RCW 82.32.291
Sales tax sourcing rules (origin vs. destination and local rate determination)
Washington applies destination-based sourcing for retail sales tax purposes. The applicable local sales tax rate and reporting location are determined by where the buyer receives the goods or services, subject to specific statutory exceptions. These rules were adopted with Washington’s participation in the Streamlined Sales and Use Tax Agreement (SSUTA) and have been effective for most transactions since July 1, 2008, under RCW 82.32.730.
Important legislative change:
- As of 2026, RCW 82.32.730 has been statutorily amended (see Engrossed Substitute Senate Bill 6113-S.SL). The precise effect of the amendment and any subsequent DOR guidance is pending at this time, but practitioners should closely monitor all official publications and statutory text for updated sourcing obligations taking effect in or after 2026.
General sourcing: tangible personal property and digital goods
- If a buyer picks up property at the seller’s business (over-the-counter), the sale is sourced to the seller’s location (origin).
- If property is delivered (by seller or third party), the sale is sourced to the delivery destination, regardless of whether delivery is direct to the buyer or to another party designated by the buyer (e.g., drop shipments).
- For digital products (including digital goods and codes), sourcing is to the location where the buyer first makes use; if undeterminable, use the purchaser address maintained in the ordinary course of business by the seller.
Services, installation, and construction
- Installation, repair, and construction services performed at the customer’s site are sourced to that location.
- For non-specified services, the detailed sourcing hierarchy is set forth in WAC 458-20-145.
Drop shipment and third-party delivery
- When property is shipped to a third party at the buyer’s direction (drop shipment), the destination to the third party controls local sourcing and the applicable rate.
Marketplace facilitators
- For retail sales made through a marketplace facilitator, the same destination-based rules apply; facilitators must source according to delivery destination per RCW 82.08.0531.
Special property types
- Sourcing for certain sales (motor vehicles, watercraft, mobile/manufactured homes) may diverge from general rules—WAC 458-20-145 and statutory amendments control these exceptions.
Practical rate application
- Sellers must collect the correct combined state and local rate based on the above sourcing logic. The DOR Rate Lookup Tool offers non-authoritative administrative support for finding the correct location code and rate, but legal liability is governed by statute and regulation.
NOTE: Sourcing rules and the operative local tax obligations may change further following the 2026 statutory revision. Practitioners should consult RCW 82.32.730 as amended and monitor DOR updates for new requirements.
Source: RCW 82.32.730; WAC 458-20-145
Key sales and use tax exemptions in Washington
Washington’s statutory exemptions for sales and use tax have been materially updated in 2026 due to new legislative action (ESSB 6231, ESSB 6346) and administrative changes. Practitioners should be aware of both new exemptions and repealed items, as well as changes to documentation requirements and statutory caps.
Major Recent Changes (Effective 2026)
- ESSB 6346 (2026): New Exemptions
- Grooming and Hygiene Products: Exempt from sales and use tax as of July 1, 2026.
- Diapers: Tax-exempt beginning July 1, 2026.
- Over-the-Counter Drugs: Exempt as of July 1, 2026, if meeting the statutory definition under new amendments.
- Qualifying Retail Services Sold to Schools and Libraries: Exempt as of July 1, 2026, with qualified institutions required to present a prescribed DOR certificate at the time of purchase. Sellers must retain certificates for five years.
- ESSB 6346, Chapter 238, Laws of 2026
- Repeal of Exemption: Data Center Replacement Equipment
- Effective July 1, 2026, the exemption for replacement equipment for eligible data centers is repealed per ESSB 6231 (Chapter 266, Laws of 2026).
- ESSB 6231, Chapter 266, Laws of 2026
- Expanded and Ongoing Exemptions
- Zero-Emission Transit Buses: Exclusion remains for qualifying purchases under RCW 82.08.994/82.12.994, but is now capped at $14 million and requires compliance with new DOR reporting effective July 1, 2025. See DOR annual zero-emission bus report for details.
- RCW 82.08.994, DOR Zero-emission bus report
- Previously Standing Major Exemptions (Unchanged)
- Sales for resale (RCW 82.08.130, 82.04.050)
- Non-prepared groceries/food ingredients (RCW 82.08.0293)
- Prescription drugs and durable medical equipment (RCW 82.08.0281, 82.08.0283)
- Manufacturing machinery & equipment (RCW 82.08.02565)
- Interstate/foreign sales (RCW 82.08.0269)
- Agricultural products and feed (RCW 82.08.0296, RCW 82.08.0277)
- Sales to federal government (RCW 82.08.0256)
- Occasional/isolated sales (RCW 82.08.0251)
Each requires strict adherence to statutory definitions and, where called for, documentation (permits/certificates/resale certificates) as described in statute and agency rules.
Documentation and Compliance
- All new and existing certificate-driven exemptions (including schools, libraries, agricultural, digital business-use exemptions) have a five-year retention requirement post-sale per DOR procedures, and forms must comply with statute or DOR specifications. Late or improper documentation voids the exemption and may result in assessments, penalties, and interest.
Effective Dates and Cross-References
- Practitioners should confirm each exemption’s operative date and scope by consulting the provided RCW citations and 2026 legislation. For transitional/expiring exemptions, check current DOR advisories and legislative summaries.
Source: ESSB 6346, Chapter 238, Laws of 2026; ESSB 6231, Chapter 266, Laws of 2026; RCW 82.08.994; DOR June 2026 zero-emission buses report; RCW 82.08.130; RCW 82.04.050; RCW 82.08.0293; RCW 82.08.0281; RCW 82.08.0283; RCW 82.08.02565; RCW 82.08.0269; RCW 82.08.0296; RCW 82.08.0277; RCW 82.08.0256; RCW 82.08.0251
Sales tax registration requirements and timing for sellers
Who must register: Any person or business that makes retail sales subject to Washington sales tax—including in-state sellers, remote sellers exceeding the economic nexus threshold, and marketplace facilitators—must register with the Washington Department of Revenue (DOR) before engaging in business or collecting sales tax. Engaging in business is defined under RCW 82.04.150 and RCW 82.32.030 requires registration prior to commencing activity.
Economic nexus and remote sellers: Remote sellers and marketplace facilitators without physical presence in Washington are required to register when their cumulative gross receipts from Washington customers exceed $100,000 in the current or prior calendar year. Under RCW 82.08.052(1)(d)(i), when a remote seller or facilitator meets this threshold, it must begin collecting and remitting sales tax. Per DOR guidance, registration must occur at the point the obligation triggers, and tax collection must begin on the first day of the month at least 30 days after the threshold is exceeded (if threshold is met in the current year) or from January 1 if threshold was met in the prior year.
Registration process and certificate: Registration is accomplished online using the Business Licensing Service (BLS) portal or directly via the DOR website. Upon approval, the seller receives a tax registration certificate, which must be conspicuously displayed at each business location in Washington (RCW 82.32.033). The DOR also requires sellers to update their business license if operations expand, relocate, or change in activity.
Timing requirements—summary:
- Sellers with physical presence: Register before conducting business or collecting tax.
- Remote sellers/marketplace facilitators: Register upon exceeding $100,000 threshold; begin collection on the first day of the month at least 30 days after threshold is exceeded (if met mid-year), or January 1 if threshold met in prior year.
Source: RCW 82.32.030; RCW 82.32.033; RCW 82.08.052; Washington DOR, Tax registration and endorsement requirements; Washington DOR, Remote sellers registration guidance
Major statutory exemptions and exclusions from Washington sales and use tax (including required documentation)
Washington law defines two broad categories of relief from sales and use tax: statutory exemptions—where a sale is taxable except as explicitly carved out by statute—and statutory exclusions—where an item or service falls outside the scope of "retail sale" as defined in RCW 82.04.050, and is therefore not taxable from the outset. Each exemption or exclusion is controlled by its own statute, with precise scope and documentation requirements. Sellers must retain proper documentation as specified in each governing RCW.
I. Statutory Exemptions
• Groceries – RCW 82.08.0293. Sales of food and food ingredients for human consumption are exempt, except for prepared foods, soft drinks, and dietary supplements, as those terms are individually defined in the statute. Sellers must verify qualifying food boundaries according to statutory definitions. Source: RCW 82.08.0293
• Prescription Drugs – RCW 82.08.0281. Sales of lawfully prescribed drugs for human use are exempt. The exemption extends to insulin and over-the-counter drugs if prescribed. Documentation must support the prescribed status; see statute for precise language. Source: RCW 82.08.0281
• Durable Medical Equipment, Prosthetics – RCW 82.08.0283. Exemptions cover durable medical and mobility enhancing equipment, prosthetic devices, and qualifying repair parts, provided use and purpose fit the statutory criteria and are prescribed for individual use. Source: RCW 82.08.0283
• Machinery & Equipment for Manufacturing – RCW 82.08.02565. Qualifying manufacturing machinery and equipment used directly in manufacturing operations are exempt. Claimants must provide an exemption certificate (prescribed by the DOR), which must be retained by the seller. This exemption does not extend to hand tools or property with a useful life of less than one year. Source: RCW 82.08.02565
• Sales for Resale – RCW 82.08.130; RCW 82.04.050(2). Sales for resale are excluded from "retail sale" if the buyer presents a valid reseller permit or a properly completed exemption certificate at the time of sale or within a reasonable period. Sellers must retain this permit/certificate under RCW 82.08.130(3); failure to do so may result in disallowance. Source: RCW 82.08.130, RCW 82.04.050
• Sales to the Federal Government – RCW 82.08.0256. Exemption applies to direct sales to the United States and its instrumentalities. Documentation typically includes purchase orders or payment cards bearing clear federal identification. Source: RCW 82.08.0256
• Interstate and Foreign Sales – RCW 82.08.0269. Sales delivered by the seller to a point outside Washington are exempt. The seller must retain transportation/shipping documentation showing the out-of-state delivery address. Source: RCW 82.08.0269
• Nonresident Exemptions/Vehicle Sales – RCW 82.08.0273. Nonresidents may qualify for exemption on vehicles or goods delivered out of state. Sellers must obtain a completed nonresident certificate at the time of sale. Source: RCW 82.08.0273
• Agricultural Inputs, Animals, Bees – RCW 82.08.0296 (feed/seed/fertilizer & certain ag chemicals), RCW 82.08.0277 (livestock, poultry, bees). Each product or user is subject to statutory limitations—farmers typically must provide a correctly completed exemption certificate as specified in each RCW. Source: RCW 82.08.0296, RCW 82.08.0277
• Digital Goods Used Solely for Business – RCW 82.08.02087. Sales of digital goods used solely for business purposes may be exempt if the buyer provides a DOR-approved Digital Products and RAS Exemption Certificate. The seller must keep this certificate for at least 5 years. Source: RCW 82.08.02087
• NEW: Retail services for schools and libraries – ESSB 6346, Chapter 238, Laws of 2026 (effective July 1, 2026). Beginning July 1, 2026, certain retail services sold to qualifying Washington schools and public libraries are exempt from sales and use tax. The exemption applies only to services enumerated in the enacting law, and eligible purchasers must present a certificate prescribed by the DOR at the time of sale. Sellers are required to retain this certificate in their records for a minimum of 5 years. Source: ESSB 6346, Chapter 238, Laws of 2026
II. Statutory Exclusions from “Retail Sale” – RCW 82.04.050 RCW 82.04.050 details categories not considered "retail sale" and therefore not subject to sales or use tax. Key exclusions (see statute for full list):
- Professional services: legal, medical, dental, architectural, engineering, accounting, and similar professions.
- Custom software development (not canned software; see RCW 82.04.050(6)(b)).
- Janitorial services (see RCW 82.04.050(2)(d)).
- Self-service laundry, tree trimming for utilities, and other specific services.
Transactions covered solely by these exclusions are not taxable, and no exemption documentation is required—eligibility depends on the statutory definition and the factual nature of the sale or service. Source: RCW 82.04.050
III. Documentation & Recordkeeping Requirements Each exemption or exclusion is governed by the retention and timing provisions set in its controlling RCW (see above). For sales for resale, machinery and equipment, agricultural, and digital business-use exemptions, a properly executed certificate or permit must be obtained at the time of sale or within a "reasonable period" defined in DOR rules (commonly, within 120 days, see WAC 458-20-102A for resale). Sellers must retain certificates for at least 5 years (minimum period generally announced by the DOR; statute itself sometimes silent or defers to the DOR or to audit requirements). If a statute or WAC prescribes a more specific rule, that provision controls.
Improper or late documentation may void the exemption or exclusion and result in tax due, plus penalties and interest. The burden of proof rests on the taxpayer or seller to substantiate entitlement to any exemption.
Source: RCW 82.08.0293, RCW 82.08.0281, RCW 82.08.0283, RCW 82.08.130, RCW 82.08.02565, RCW 82.08.0256, RCW 82.08.0269, RCW 82.08.0296, RCW 82.08.0277, RCW 82.08.0273, RCW 82.08.02087, RCW 82.04.050, ESSB 6346, Chapter 238, Laws of 2026
Sourcing hierarchy for local sales tax on installation, repair, and construction services (WAC 458-20-145)
Washington’s WAC 458-20-145 sets a mandatory sourcing hierarchy to determine which local sales tax rate applies when taxable installation, repair, construction, or other retail services are provided at multiple or indeterminate locations. Sellers must follow these steps in order, using the first prong that applies:
Stepwise Sourcing Hierarchy:
- Seller’s business location: If the customer (or their donee/recipient) receives the service at the seller’s fixed place of business, the sale is sourced to that location. (Example: Car brought to a repair shop in Bellingham—use Bellingham’s rate.)
- Where the buyer/recipient receives the service: If not received at the business location, source to the location where the buyer (or their donee/recipient) receives the service. This typically covers installation, repair, or construction at the customer’s premises. (Example: Flooring installed at a customer’s address in Wenatchee by a contractor—Wenatchee rate applies.)
- Purchaser’s address in seller’s records: If neither of the above applies, use the address of the purchaser available from the seller’s ordinary business records, barring bad-faith misclassification. (Rare; Example: Seller only communicates and ships billing to an address without site or service documentation—use address in records.)
- Address obtained at time of sale: If there’s no record-maintained address, use any address obtained in connection with the consummation of the sale (e.g., address supplied at time of order or invoicing). (Example: Company takes address at invoice as sole address—use this for sourcing.)
- Address from which the service was provided: If none of the above apply, source to the address from which the seller provided the service. This is a last-resort fallback. (Example: No documentation—use contractor’s business address as the local tax location.)
Key practicalities:
- The hierarchy applies in order; do not skip to a later step if an earlier one applies.
- “Recipient” or “donee” language means that if the service is provided not directly to the buyer but to a third party on their behalf, that location controls.
- Rules 3 and 4 are rare—ordinarily, either the site of service (Rule 2) or the seller’s business address (Rule 1/Rule 5) will apply. Only use record- or sale-based addresses when prior steps fail.
Authority note: WAC 458-20-145(2)(a)-(e) gives statutory sourcing logic for all local retail sales tax, including installation, repair, and construction. Additional service categories may be addressed elsewhere in the WAC if specifically excluded from retail sale, but those not so excluded fall under this hierarchy.
Source: WAC 458-20-145
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Refunds, credits, and corrections for over- or under-collected sales and use tax in Washington
Washington law allows both sellers and buyers to seek a refund or credit of sales or use tax that was erroneously overpaid, or to correct prior returns when the proper amount of tax was not collected or remitted. Procedures, time limits, and documentation requirements are governed by statute (RCW 82.32.050-.060) and detailed in DOR regulations (WAC 458-20-229), with several practical distinctions and common pitfalls relevant to practitioners.
Time limits (statute of limitations):
- Refund, credit, or amended return claims generally must be filed within four years of the close of the tax period for which the tax was overpaid or underpaid (RCW 82.32.050(3)).
- Refund applications are generally barred after four years, unless the Department waives the statute for certain periods due to audit, waiver, or other agreement (RCW 82.32.050(7)).
Sellers vs. buyers—who claims the refund?:
- The seller generally must request the refund or credit when tax was over-collected and remitted to the Department (WAC 458-20-229(2)). If the seller refunds the tax to the buyer, the seller may file for a refund or take a credit, but must provide documentation showing the buyer has been made whole and has not claimed a separate refund.
- Buyers (consumers) may request a refund from the Department only if they can establish they paid the tax directly (e.g., use tax remittances) or if the seller is unable or unwilling to claim the refund on their behalf.
Forms and required documentation:
- All refund claims require a Department of Revenue Refund Request form (Form REV 41 0100) or a written request providing the information required by WAC 458-20-229(4).
- Key documents include: amended returns, invoices, proof of payment, and (for seller claims) a declaration that the seller has reimbursed the buyer or is seeking credit on behalf of (not duplicate to) the buyer. The DOR may disallow duplicative claims.
Correcting previous returns:
- To correct prior periods (underpayments or overpayments), sellers amend their returns online (via My DOR) or in writing with supporting documentation and a statement of reason. If a correction is due to audit findings, additional procedures and timeframes may apply. Substantial correction claims may prompt DOR review at their discretion.
Common pitfalls:
- Double refunds (both buyer and seller claiming same tax), insufficient documentation, missing deadlines, and failure to properly reimburse buyers are critical issues that often result in denial of relief.
Source: RCW 82.32.050; RCW 82.32.060; WAC 458-20-229; WA DOR refund request instructions