Washington State B&O Tax Explained

Washington is one of the few states without a personal or corporate income tax. Instead, the state generates revenue primarily through the Business & Occupation (B&O) tax. Because it taxes gross receipts rather than net profit, a misunderstanding of how the B&O tax works can severely erode your margins.

What is the B&O Tax?

The Washington State B&O tax is a gross receipts tax. This means it is measured on the value of products, gross proceeds of sale, or gross income of the business.

Unlike a traditional income tax, there are no deductions for labor, materials, rent, or other costs of doing business. If your business brings in $1,000,000 in gross revenue, you owe tax on that $1,000,000—even if your net profit was zero or you operated at a loss.

Major B&O Classifications and Rates

The rate you pay depends entirely on the classification of your business activity. Many businesses perform activities that fall under multiple classifications and must segregate their revenue accordingly. The three most common classifications are:

1. Service and Other Activities (1.5%)

This is a catch-all category for businesses providing professional or personal services. It carries the highest major rate.

• Who falls here: Consultants, accountants, attorneys, doctors, real estate agents, software developers.
• Rate: 1.5% (plus an advanced computing surcharge for certain high-revenue tech companies).

2. Retailing (0.471%)

Selling goods or certain services directly to the end consumer. If you are subject to the Retailing B&O tax, you must also collect retail sales tax from the buyer (unless an exemption applies).

• Who falls here: Retail stores, restaurants, construction contractors.
• Rate: 0.471%

3. Wholesaling (0.484%)

Selling goods to buyers who will resell them in the regular course of business. To qualify, you must obtain a reseller permit from your buyer.

• Who falls here: Manufacturers selling to distributors, distributors selling to retailers.
• Rate: 0.484%

The Local Layer: City B&O Taxes

The state isn't the only entity collecting B&O. Nearly 50 cities in Washington—including Seattle, Bellevue, Tacoma, and Everett—impose their own local B&O taxes.

If your business is located in Seattle, or if you make sales to customers in Seattle (nexus), you must file a separate Seattle B&O return. Seattle's service classification rate is currently 0.427%, meaning a service business in Seattle pays a combined State and City B&O tax near 2% of gross revenue.

Common Mistakes We See

1. Apportionment Errors: Service businesses selling to clients outside of Washington often mistakenly pay B&O tax on all revenue. Washington allows service businesses to apportion income based on where the benefit of the service is received. If 40% of your clients are in Oregon, you may only owe WA B&O on 60% of your revenue.
2. Failure to Collect Reseller Permits: If you claim the wholesale rate but cannot produce valid reseller permits during an audit, the state will reclassify the sales as retail—and assess you for both the higher B&O rate AND the uncollected sales tax, plus penalties.
3. Intercompany Transfers: Moving money between two related LLCs without proper documentation can inadvertently trigger B&O tax on the transfer.

Planning Strategy: Action Steps

Because the B&O tax targets top-line revenue, it cannot be managed with end-of-year expense planning (like buying equipment or pre-paying rent). It must be managed through proper structural classification and rigorous apportionment tracking year-round.

If you haven't reviewed your B&O classifications and out-of-state apportionment percentages in the last 12 months, schedule a review with our tax strategy team. Correcting an apportionment error can yield immediate, dollar-for-dollar savings to your bottom line.