What Is the Washington B&O Tax and Who Has to Pay It?

What Is the Washington B&O Tax and Who Has to Pay It?

The Washington B&O tax is a gross receipts tax on the value of products, gross proceeds of sale, or gross income of a business. Because it applies to gross income, businesses cannot deduct labor, materials, taxes, or other costs of doing business. That means a company can owe B&O tax in a year it lost money.

That last sentence is the whole thing. Everything else is detail.

Washington famously has no personal income tax and no corporate income tax, and the B&O is a large part of how the state funds itself instead. If you sell into Washington, hire there, or are thinking about incorporating there because of the no-income-tax reputation, this is the tax you should understand first.

Source: Washington Department of Revenue, Business and occupation tax.

How It Differs From an Income Tax

An income tax takes a share of profit. The B&O takes a share of revenue.

A consulting firm billing $1,000,000 with $950,000 of costs has $50,000 of profit and owes B&O on the full $1,000,000. A distributor with thin margins owes on every dollar that passes through. Low-margin businesses carry a disproportionate share of this tax by design, and that is the single most important planning implication.

One more structural point: the B&O is not collected from customers. It is paid by the business. Retail sales tax works the opposite way, which is why the two get confused.

The 2026 Washington B&O Tax Rates

DOR maintains more than 50 classifications. These are the ones most businesses land in:

Classification	Rate
Retailing	0.471%
Wholesaling	0.484%
Manufacturing	0.484%
Service and other activities, prior year income under $1M	1.5%
Service and other activities, $1M to $4,999,999	1.75%
Service and other activities, $5,000,000 or more	2.1%
Real estate commissions	1.5%

Source: DOR, B&O tax classifications.

Two things to notice. Service businesses pay roughly three to four and a half times the rate that retailers and manufacturers do. And the service rate is now tiered, which took effect October 1, 2025 under ESHB 2081.

The tier is set by prior calendar year gross income of the business subject to this tax, measured across the affiliated group. Hospitals, real estate brokers, and select advanced computing businesses stay at 1.5% regardless of size.

If a business conducts more than one type of activity, it reports under more than one classification. A manufacturer that also sells at retail reports both, though the Multiple Activities Tax Credit generally prevents paying twice on the same product.

Who Has to Register and File a Washington B&O Tax Return

Two different thresholds, and people merge them.

Registration. You need a Washington business license if any of these apply: gross income of $12,000 per year or more, you collect retail sales tax, you use a name other than your full legal name, you plan to hire within 90 days, or you meet nexus thresholds.

Economic nexus for out-of-state businesses. Register to report B&O and collect sales tax if, in the current or prior year, you have physical presence in Washington, more than $100,000 in combined gross receipts sourced or attributed to Washington, or you are organized or commercially domiciled there. There is no transaction-count test; the 200-transaction threshold was eliminated in 2019.

Source: DOR, out-of-state businesses reporting thresholds and nexus.

Filing frequency is set by annual tax liability: annual filing at $1,050 or less, quarterly from $1,051 to $4,800, monthly above $4,800. Monthly returns are due the 25th of the following month, quarterly at the end of the month after quarter close, annual on April 15.

Some registered businesses qualify for active non-reporting status, meaning they stay registered but do not file. That requires collecting no retail sales tax, gross income under $125,000 per year across all B&O classifications, public utility tax gross under $24,000, and no other DOR tax owed.

The Small Business Credit Is the Real Exemption

Washington does not have a filing threshold that exempts small businesses from the tax. It has a credit that functions like one.

The credit is capped at $55 per month for non-service businesses and $160 per month for service businesses, and it phases out as liability rises above those amounts. It is fully gone once tax due reaches $110 for non-service filers or $320 for service filers.

In practical terms it exempts roughly the first $125,000 of business income and fully phases out somewhere around $250,000. It is applied automatically when you file electronically.

A scheduled increase, but not soon. The non-service credit rises to $125 per month and the service credit to $375 per month, with the gross-income ceiling for active non-reporting status moving from $125,000 to $250,000, effective January 1, 2029. A number of secondary sources reported these as 2026 changes. They are not.

Sources: DOR, credits, plus RCW 82.04.4451 and RCW 82.32.045 as amended effective January 1, 2029.

The 2025 Change That Caught Service Businesses Off Guard

ESSB 5814 took effect October 1, 2025 and made a set of services into retail sales, subject to both retail sales tax and retailing B&O:

• Advertising services
• Information technology services
• Custom website development
• Custom software and customization of prewritten software
• Temporary staffing
• Live presentations
• Investigation, security services, security systems services, and armored car services

Source: DOR, services newly subject to retail sales tax.

Here is the part that surprises people: for the affected firms, this is a B&O rate decrease. Income moves from the service classification at 1.5% to 2.1% down to retailing at 0.471%. The cost is the new obligation to collect and remit retail sales tax from customers, which is an administrative and pricing problem rather than a tax-on-you problem.

Two caveats worth stating. Parts of ESSB 5814 are the subject of active litigation, and DOR's position is that businesses must continue to collect and remit while it proceeds. And the repeal you may have read about is real but scheduled: these services, except advertising, are repealed effective January 1, 2029, not now.

A set of new exclusions and exemptions did take effect July 1, 2026, including for nonprofit and musical or dramatic live presentations, one-on-one tutoring and consulting, and purchases by schools and public libraries.

Do Not Forget the City

Many Washington cities levy their own B&O tax on top of the state's. DOR does not administer or collect them.

Seattle's changed substantially in 2026. Rates for 2026 through 2032 are 0.342% for manufacturing, wholesaling, retail sales and retail services, and 0.658% for service and other business activities. More importantly, effective January 1, 2026 the taxable threshold rose from $100,000 to $2 million, with a $2 million standard deduction for businesses above it.

A business under $2 million still has to file a return, reporting zero due, and still has to renew its business license. Source: City of Seattle, Seattle Shield B&O tax changes.

Two Deductions Nearly Everyone Misses

Apportionment. Service income and real estate commission income are apportionable, meaning only the portion attributed to Washington is taxable. For a multi-state service firm this is the single largest lever available, and it is frequently ignored by businesses that register in Washington and then report all of their revenue there.

The Multiple Activities Tax Credit. A business that both manufactures and sells in Washington pays B&O once rather than twice, via credit. It also covers qualifying gross receipts taxes paid to other states. It requires filing Schedule C each time it is claimed.

Several credits people still reference have been repealed or expired, including the Capital Gains B&O Credit (repealed December 31, 2025) and the International Services Credit (repealed January 1, 2026). Verify before relying on one.

One More Thing About the No-Income-Tax Reputation

It is true today and it has a scheduled expiration date.

DOR now states that beginning January 1, 2028, a 9.9% income tax will apply to individuals and married couples filing jointly with annual adjusted gross income exceeding $1 million, with the first return due in 2029. It was enacted by ESSB 6346 in March 2026, and the legislation provides that if a court of final jurisdiction invalidates the tax, most of the bill, including the tax and the associated B&O credits, is void.

Source: DOR, Income tax.

So the accurate statement in 2026 is: no corporate income tax, no personal income tax currently, a high-earner individual tax scheduled for 2028, and litigation risk attached to it. Anyone telling you Washington will never have an income tax is describing 2024.

Getting Help With a Washington Filing Position

The judgment calls here are classification, apportionment, and whether a service now falls under the retail rules. Those three decide most of what a Washington business actually pays, and they are not obvious from the return.

System Six is a Seattle firm founded in 2009 offering bookkeeping and accounting services, with stated specialties in SMB owners and real estate investors. Long tenure operating in Washington is a relevant qualification here, given how much of this changed in the last twelve months.

The honest limitation: no firm can make a gross receipts tax behave like an income tax. If your margins are thin, B&O will be a meaningful cost, and the useful work is classification accuracy and apportionment rather than reduction.

You can compare firms by location, specialty, and verified reviews in the Sam's List accountant directory.

Frequently Asked Questions

Do I owe Washington B&O tax if my business lost money? Yes. The B&O is calculated on gross receipts with no deduction for labor, materials, taxes, or other costs of doing business, so profitability is irrelevant to whether the tax is owed. This is the main way it differs from an income tax and the main reason low-margin businesses feel it most.

What is the Washington economic nexus threshold? More than $100,000 in combined gross receipts sourced or attributed to Washington in the current or prior calendar year triggers a requirement to register, report B&O, and collect retail sales tax. Physical presence or being organized or commercially domiciled in Washington also triggers it. There is no transaction-count threshold.

Is B&O tax the same as Washington sales tax? No. B&O is paid by the business on its gross income and is not collected from customers. Retail sales tax is collected from the customer and remitted to the state. A retailer generally owes retailing B&O on its gross receipts and separately collects sales tax on the same sales.

Does Seattle have its own B&O tax? Yes, and so do many other Washington cities. Seattle's 2026 through 2032 rates are 0.342% for retail, wholesale and manufacturing and 0.658% for services, with a taxable threshold of $2 million starting January 1, 2026. Businesses below that threshold still must file a return and renew their business license.

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About the author: Kimberly Green is the cofounder of Sam's List, where business owners and high earners find vetted CPAs, financial advisors, and fractional CFOs. She's met one-on-one with 400+ financial professionals and writes from the real data behind thousands of client-advisor matches. Ask her anything about finding an accountant - she's heard it all, including the questions people are afraid to ask.