A business and occupation tax, usually shortened to B&O tax, is a tax that a state or local government charges a business on its gross receipts for the privilege of operating within the jurisdiction. It is calculated on total revenue before any deduction for labor, materials, rent, or other costs, which makes it fundamentally different from a tax on profit. Washington state uses the B&O tax as its primary business tax, several Washington cities layer their own versions on top, and a handful of other states run similar gross receipts taxes under different names.1Washington Department of Revenue. Business and Occupation Tax
How a B&O Tax Differs From Income and Sales Taxes
The defining feature is the base. A business that brings in $2 million in revenue but loses money after expenses still owes B&O tax on the full $2 million. A corporate income tax, by contrast, only applies when the bottom line is positive. Washington does not impose a traditional state income tax on businesses at all and relies on the B&O tax to do that work instead.
A B&O tax is also distinct from a sales tax. Sales tax is collected from the customer at the register, with the business acting as a conduit to the state. B&O tax is levied on the business itself, based on what the business earns. Both can apply to the same transaction, so a Washington retailer may owe B&O tax on its gross receipts and collect sales tax from the buyer on the same sale.
Because nothing is deducted for cost of goods sold, wages, or overhead, the effective rate on actual profit can be far higher than the nominal rate on gross receipts. A business running on thin margins feels the tax more than one with wide margins, even though both pay the same percentage of revenue.
Where B&O Taxes Apply
Washington is the only state that imposes a broad-based B&O tax covering virtually all commercial activity. West Virginia also uses the B&O label, but its tax applies only to public service and utility businesses, not to businesses generally.2West Virginia Tax Division. Business and Occupation Tax
Dozens of Washington cities impose their own B&O taxes on top of the state version. Seattle is the most prominent example, requiring businesses operating within city limits to obtain a city business license and pay a separate city-level B&O tax.3City of Seattle. Business Taxes A business operating across multiple Washington cities can face overlapping local obligations. Cities use a model ordinance with apportionment rules to keep the same income from being fully taxed by more than one city, but tracking several local tax codes still creates real administrative work.
Similar Gross Receipts Taxes Elsewhere
Several other states run taxes that work like B&O taxes under different names. Ohio’s Commercial Activity Tax applies to businesses with more than $6 million a year in taxable gross receipts, charged at 0.26% above that threshold.4Ohio Department of Taxation. Commercial Activity Tax (CAT) Nevada’s Commerce Tax kicks in for businesses exceeding $4 million in Nevada gross revenue, with rates varying by industry.5State of Nevada Department of Taxation. Commerce Tax FAQs Delaware, Oregon, Tennessee, and Texas also impose some form of gross receipts tax. Portland, Oregon, is a common source of confusion: its Business License Tax is a net income tax, not a gross receipts tax, so it is structurally different from a B&O tax despite being a local business levy.6City of Portland. Business Tax Filing and Payment Information
Classifications and Rates
Washington’s B&O tax does not use a single flat rate. Activities are sorted into classifications, each taxed at its own rate:7Washington Department of Revenue. Business and Occupation (B&O) Tax
- Retailing: 0.471% of gross receipts
- Wholesaling: 0.484% of gross receipts
- Manufacturing: 0.484% of gross receipts
- Service and Other Activities: 1.5% to 2.1% of gross income, depending on the business’s prior-year revenue
The service rate changed significantly starting January 1, 2026. Businesses reporting less than $1 million in prior-year service income pay 1.5%. Those with prior-year service income between $1 million and just under $5 million pay 1.75%. Businesses at $5 million or above pay 2.1%. Hospitals and certain advanced computing businesses are exempt from the higher tiers and remain at 1.5% regardless of revenue.8Washington Department of Revenue. Service and Other Activities Rate Changes
Getting the classification right matters. A company providing professional services that reports under retailing pays the wrong rate, and when the Department of Revenue catches the error during an audit, the business owes the difference plus penalties and interest. If your business does more than one type of activity, you report each one under its own classification and pay the corresponding rate for each.
Deductions and Credits
Even though B&O has no deduction for ordinary operating costs, specific statutory deductions narrow the taxable base. The most valuable one for many businesses covers interstate sales. When you sell goods shipped to and accepted by a buyer outside Washington, those receipts can be deducted from your taxable amount. The deduction exists to keep the tax from running afoul of the Commerce Clause, and it applies whether you ship by your own trucks, a freight carrier, or a consolidator, as long as the buyer receives the goods outside the state.9City of Seattle. Directors Rule 5-031 – Measure of Tax – Retailers and Wholesalers Other common deductions cover previously reported bad debts, certain payments to subcontractors, and receipts from sales where the buyer provides a resale certificate. Claiming a deduction requires documentation; without shipping records for an interstate sale, for example, the deduction gets disallowed and the full gross amount becomes taxable.
Two credits reduce the tax on top of any deductions. The Multiple Activities Tax Credit prevents double taxation when a single product moves through more than one taxable stage within the same business, such as a product manufactured in Washington and then sold at retail in Washington. Without the credit, the company would owe manufacturing B&O tax on the product’s value and retailing B&O tax on the sale price; the credit allows the effective tax to be paid only once.10Washington Department of Revenue. Multiple Activities Tax Credit (MATC)
The Small Business B&O Tax Credit reduces or eliminates the tax for the smallest filers. For annual filers with income primarily from non-service activities, the credit applies when total B&O tax liability is below $1,320 for the year. Service-heavy businesses get a higher threshold of $3,840 annually. Monthly and quarterly filers have proportionally lower per-period thresholds. The credit phases out as liability rises, so businesses just above the threshold still receive a partial credit.11Washington Department of Revenue. Credits
Public utilities in Washington do not pay B&O tax at all. They pay a separate Public Utility Tax under a different chapter of state law, covering transportation, communications, electrical power, natural gas, water, sewerage, and railroads.12Washington Department of Revenue. Public Utility Tax
Out-of-State Businesses and Economic Nexus
You do not need a physical office or warehouse in Washington to owe B&O tax. Since January 2020, any business with more than $100,000 in combined gross receipts sourced to Washington in the current or prior year must register, report B&O tax, and collect applicable sales tax.13Washington Department of Revenue. Out of State Businesses Reporting Thresholds and Nexus The threshold catches many e-commerce sellers and remote service providers who may not realize they have a Washington tax obligation. All types of receipts attributed to Washington count toward the threshold, not only sales of goods. Service revenue, royalties, and other income sourced to Washington all qualify.
Filing and Payment
How often you file depends on how much you owe. Washington assigns filing frequencies based on estimated annual tax liability:14Washington Department of Revenue. Filing Frequencies and Due Dates
- Annual filing: total B&O tax liability of $1,050 or less per year
- Quarterly filing: total B&O tax liability between $1,051 and $4,800 per year
- Monthly filing: total B&O tax liability above $4,800 per year
Some industries have different defaults. Construction and restaurant businesses file at least quarterly regardless of liability, and auto dealers file monthly. On each return, you list gross receipts for each classification separately, apply any deductions to arrive at the net taxable amount per classification, and multiply by the corresponding rate. The sum across all classifications is your total B&O tax due. Washington mandates electronic filing and electronic payment for most businesses.
Penalties for Late Payment
Missing a B&O deadline triggers automatic penalties that stack quickly:15Washington State Legislature. Revised Code of Washington 82.32.090 – Late Payment – Disregard of Written Instructions – Evasion – Penalties
- 9% penalty if the tax is not paid by the due date
- 19% total penalty if still unpaid by the last day of the following month
- 29% total penalty if still unpaid by the last day of the second month after the due date
These are total penalties, not additive. Pay two months late and you owe 29% on top of the original tax, not 9% plus 19% plus 29%. The minimum penalty is $5.
Separate penalties apply when the Department of Revenue finds a substantial underpayment during an audit. If you paid less than 80% of what you actually owed and the underpayment is at least $1,000, the department assesses an additional 5% penalty on the amount due, rising to 15% if you do not pay within the notice period and 25% if payment remains outstanding 30 days after the notice deadline. The most severe consequence is the evasion penalty of 50% of the additional tax due, reserved for intentional fraud rather than bookkeeping errors; the department must prove intent through clear, cogent, and convincing evidence.