Sales Tax on Cleaning Services in Washington (2026)

Washington Splits Cleaning Into Two Completely Different Tax Regimes Based on How Routine the Work Is

Washington State has no general sales tax on most services, but it does not exempt cleaning outright either; instead it applies one of the more structurally distinct frameworks in this entire batch. Under WAC 458-20-172 and the definitional anchor in RCW 82.04.050(2)(d), "routine janitorial services," the recurring, regularly scheduled cleaning that commercial janitorial businesses normally perform, interior and exterior window washing, floor cleaning and waxing, interior wall and woodwork cleaning, in-place rug and drapery and upholstery cleaning, dusting, trash disposal, and bathroom cleaning and sanitizing, are excluded from Washington's retail sales tax entirely. Instead, that routine janitorial revenue is taxed only under the state's Business and Occupation (B&O) tax, specifically the Service and Other Activities classification, at a graduated rate: 1.5 percent for businesses under $1 million in gross annual revenue, rising to 1.75 percent between $1 million and $5 million, and 2.1 percent above $5 million. No retail sales tax is collected from the client at all on this category of work. See the Department of Revenue's own Common Janitorial Services industry guide for the department's current framing of exactly which activities fall into this routine category.

Everything that does not fit the "routine" description flips to the opposite treatment entirely. Specialized or non-repetitive cleaning, exterior wall washing, septic tank cleaning, post-construction or fire and flood cleanup, sandblasting, snow removal, industrial machinery cleaning, and pressure washing, is treated as a retail sale under Washington law. That means Retailing B&O tax at 0.471 percent plus full retail sales tax, at the state's 6.5 percent rate plus local additions that push combined rates to roughly 10.35 percent in Seattle, around 10.3 percent in Bellevue and Tacoma, approximately 9.0 percent in Spokane, and near 9.5 percent in Olympia. The Department of Revenue's Determination No. 20-0012, published at 41 WTD 24 (2022), along with Excise Tax Advisory ETA 3209.2018, works through the line between these two categories in detail and is the primary reference for any borderline scope-of-work question.

Washington's Two-Track Cleaning Tax System

Why Classification Is the Whole Ballgame in Washington

Because the tax consequence of misclassifying a job in Washington runs in the tens of percentage points, no sales tax at all versus a combined rate approaching 10 percent in Seattle, this is the single most consequential classification decision a cleaning business in this state will make on any given contract. A janitorial company that performs weekly recurring office cleaning under a standard service contract sits cleanly in the routine category. The same company taking on a one-time post-construction cleanup job for a general contractor client sits just as cleanly in the specialized, retail-taxable category. The harder cases are things like an annual deep-clean add-on to an otherwise routine monthly contract, or exterior pressure washing performed twice a year as part of a broader janitorial relationship; these edge cases are exactly what Det. No. 20-0012 and ETA 3209.2018 were written to address, and a business regularly performing this kind of mixed-scope work should have a documented internal policy, reviewed against current DOR guidance, for how each job type gets classified before the invoice goes out, not after a field audit raises the question.

Worked Example: The Same $10,000 Monthly Revenue, Two Different Tax Outcomes

If your $10,000 monthly revenue comes entirely from routine recurring janitorial service for a mid-size business under the $1 million annual revenue tier, your B&O liability is calculated on gross receipts at 1.5 percent: $10,000 × 0.015 = $150 in B&O tax, paid by your business, not collected as a separate line item from the client, since B&O is legally your tax, though many businesses build it into their pricing. No retail sales tax applies at all. Now suppose that same $10,000 in monthly revenue instead comes from specialized pressure-washing and post-construction cleanup work performed in Seattle, where the combined retail sales tax rate is 10.35 percent: this revenue is subject to Retailing B&O at 0.471 percent ($47.10) plus retail sales tax collected from the client at 10.35 percent ($1,035), for a client invoice totaling $11,035 and a combined tax burden of $1,082.10, more than seven times the tax cost of the identical dollar amount of routine janitorial work. That gap is the entire reason Washington cleaning businesses need airtight service classification built into their contracts and invoicing from day one.

The Audit Question Washington Businesses Should Expect

Department of Revenue field auditors reviewing a Washington cleaning company's returns typically focus first on whether revenue reported under the low-tax routine janitorial B&O classification actually matches the recurring, regularly-scheduled service description that classification requires, since the financial incentive to mischaracterize specialized work as "routine" is substantial given the tax rate gap involved. Keep contract documentation, service schedules, and job descriptions that clearly support the classification you have applied to each revenue stream, and if your business genuinely operates in both categories, routine monthly contracts alongside occasional specialized jobs, maintain separate accounting codes for each from the start rather than trying to reconstruct the split after the fact during an audit.

Sales tax is only half the picture in this state. The business and occupation tax applies to gross receipts with no deduction for labor or materials, so a janitorial contract generates a B and O liability regardless of how the sales tax question resolves. That structure penalizes low-margin work in a way a conventional sales tax does not. Participation as a full member of the Streamlined Sales Tax Governing Board covers the sales tax side through certified definitions, but the B and O calculation sits entirely outside that framework.

Registering for a B&O Account Even When No Sales Tax Applies

A common misconception among cleaning businesses new to Washington is assuming that because routine janitorial work carries no retail sales tax, no state registration is required at all. That is incorrect. Every business operating in Washington, regardless of which B&O classification applies, registers for a Washington Business License through the Department of Revenue's Business Licensing Service and reports gross receipts under the applicable B&O classification on a recurring basis, monthly, quarterly, or annually depending on revenue volume. A business that only performs routine janitorial work still owes B&O tax on every dollar of gross receipts, calculated at the tier-appropriate rate, and still files a return reporting that liability even though no retail sales tax line ever appears on a client invoice.

For a company straddling both classifications, the registration itself does not change, but the return preparation does, since each classification's gross receipts must be reported separately using the correct B&O tax classification code, with retail sales tax reported as an additional line only against the specialized-work receipts. Getting this split wrong on the return itself, even when the underlying invoicing was correctly classified, is enough to trigger a desk audit asking for reconciliation between your invoices and your filed return.