Washington Local B&O Tax: Rates, Apportionment, and Filing

Roughly 40 cities in Washington charge their own Business and Occupation tax on top of the state B&O tax, and the Washington local B&O tax is calculated on gross receipts rather than on profit. Each city sets its own rates, thresholds, and exemptions under authority from state law, and each collects its own returns. If your business earns revenue in more than one Washington city, you may owe in each of them.

When a City Can Tax Your Business

A city can only tax you if your business has nexus there. Nexus takes two forms.

Physical nexus is the obvious kind: an office, warehouse, or inventory in the city. Sending employees in to perform work, make deliveries in company vehicles, or visit clients also counts. State guidance says physical presence “requires only more than the slightest presence,” so even occasional activity can trigger it.¹

Economic nexus catches businesses that sell into a city without ever going there. Under RCW 35.102, Washington cities follow a standardized Model Ordinance that governs nexus rules, and cities can apply economic thresholds to remote sellers consistent with the framework the U.S. Supreme Court set out in South Dakota v. Wayfair.² The specific dollar threshold varies, so check each city’s ordinance if you sell there without a physical location.

Delivery trucks entering a city, sales reps making on-site visits, and equipment kept in a jurisdiction all commonly create nexus without the business realizing it. Records of where your employees work and where your products are delivered are the best defense if a city ever questions your position.

How Revenue Is Classified

Once nexus exists, you classify your gross receipts into categories that determine the rate. Cities must use the Model Ordinance definitions, built on the same framework as chapter 82.04 RCW.² The main categories:

Retailing: sales of goods or certain services to final consumers.
Wholesaling: sales to other businesses for resale.
Manufacturing: transforming raw materials into new products within city boundaries. Software development does not qualify as manufacturing under the Model Ordinance.
Services and other activities: a catch-all for professional work such as legal, accounting, and consulting, along with anything that does not fit the other headings.

Rates differ by category in most cities, so misclassifying service income as retail (or the reverse) can lead to back-tax assessments in an audit. Revenue in more than one category gets reported separately, with the matching rate applied to each stream.

What the Rates Look Like

Local B&O rates span a wide range. At the low end, cities like Algona charge a flat 0.00045 (0.045%) across all categories. At the high end, Seattle’s 2026 rate for services and other activities reaches 0.00658 (0.658%).³ Most cities land between 0.001 and 0.002 for retail and manufacturing, and service rates often run higher.

State law caps the retail B&O rate at 0.2% of gross receipts unless voters approve a higher rate. No similar cap applies to services, which is why cities like Seattle and Bellingham charge significantly more for service income than for retail. Confirm the current schedule with the Association of Washington Cities or the city’s finance department before filing, since rates can change with each budget cycle.

Splitting Income Between Cities

Businesses operating in more than one city have to divide their income among those jurisdictions. The Model Ordinance uses two methods, depending on what you sell.

Sales of Goods

For tangible personal property, income is allocated to the city where delivery occurs.² Manufacture a product in Tacoma, ship it to a customer in Bellevue, and the sale is sourced to Bellevue. Retailers and wholesalers need to track delivery destinations by city, not just by state.

Service Income

Service income uses a two-factor apportionment formula. You multiply your total apportionable service income by a fraction. The numerator is the sum of a payroll factor and a service-income factor; the denominator is two.²

Payroll factor: compensation paid to employees assigned to or working in the city, divided by your total compensation everywhere.
Service-income factor: service revenue attributable to customers located in the city, divided by your total service revenue everywhere.

The formula averages where your people work with where your customers are. A consulting firm with most employees in Seattle but most clients in Bellevue splits its taxable income between the two rather than paying the full amount in either. If the standard formula does not fairly represent your activity, either you or the city can petition for an alternative method, such as separate accounting or additional factors.⁴

Small Business Thresholds and Deductions

Every city with a B&O tax must set a small business threshold of at least $20,000 in annual gross income.⁵ Cities can go higher but not lower. Bellevue, for example, exempts businesses with taxable gross receipts of $215,000 or less annually.⁶ Even below the threshold, many cities still require a return to keep your business license active.

Common deductions include revenue from interstate sales where goods are delivered outside Washington, returns and allowances given to customers, and cash discounts. Every deduction needs documentation; cities will ask why receipts were excluded, and missing records will not survive an audit.

Multiple Activities Tax Credit

The Multiple Activities Tax Credit (MATC) prevents double taxation when the same income could be taxed under more than one category or in more than one city. State law requires every city with a B&O tax to offer a credit system meeting RCW 35.102.060.⁵

Two scenarios come up most often. If your business manufactures a product and then sells it at retail, both activities generate gross income that could be taxed, and the MATC keeps you from paying twice on the same revenue. If you’ve already paid B&O tax to another Washington city on the same income, you can claim an external credit against what you owe in the second city.⁷ The credit applies only to local B&O taxes; paying state B&O does not qualify you for a local MATC credit.

Common Exemptions

Some businesses and types of income are exempt from local B&O tax entirely. Specific exemptions vary by city, but common categories include insurance companies (which pay a separate state insurance premiums tax), credit unions (in cities like Seattle), W-2 employees (independent contractors are not exempt), casual or isolated sales outside your normal business activity, certain nonprofits providing services like debt counseling or sheltered workshops, farming income from agricultural products, and motor fuel sales already subject to the state fuel excise tax.

Exemptions are not automatic. Most cities require you to register and file returns even when all your income is exempt. Seattle lists its exemptions in SMC Chapter 5.45.090; other cities have their own lists with different details.⁸

How to File and When

To file a local B&O return, you need your nine-digit Unified Business Identifier (UBI) number and the account or license number issued by the city’s finance department. You break down your gross receipts by activity category for each city where you owe tax.

Many of the largest cities participate in FileLocal, a centralized portal that handles returns and business license renewals for multiple cities. Participating cities include Auburn, Bellevue, Des Moines, Everett, Kent, Lake Forest Park, Renton, Seattle, Shoreline, and Tacoma.⁹ Cities outside FileLocal maintain their own filing sites or accept paper returns.

Filing frequency (monthly, quarterly, or annual) depends on the size of your tax liability, and cities assign the schedule. For state B&O returns, monthly returns are due the 25th of the following month, quarterly returns are due at the end of the month after the quarter closes, and annual returns are due April 15.¹⁰ Local deadlines generally track this pattern, but confirm with your city, since the Model Ordinance allows some variation. Most systems accept ACH transfers, and some allow credit cards or mailed checks.

Keep state and local records aligned. Discrepancies between the gross revenue on your state return and the amounts on your local returns draw attention from municipal auditors. Washington requires businesses to keep records for at least five years.¹¹

Late Penalties and Interest

State law requires cities to calculate penalties and interest under chapter 82.32 RCW, so the structure is largely standardized.⁵ Late penalties climb quickly:

1 to 30 days late: 9% of the tax due (minimum $5).
31 to 60 days late: 19% of the tax due (minimum $5).
61 or more days late: 29% of the tax due (minimum $5).

Interest accrues on top of the penalty from the original due date.¹² Two missed months puts you at the maximum penalty rate. Cities can also revoke your business license for persistent non-filing, which shuts down your legal ability to operate in that jurisdiction.

If your business closes or stops operating in a city, file a final return to close the account. Otherwise the account stays open, and the city may issue estimated assessments based on prior filings, creating a tax bill and late fees on a business that no longer exists.

1
Washington Department of Revenue. Physical Presence Nexus
2
Washington State Legislature. Washington Code Chapter 35.102 – Municipal Business and Occupation Tax
3
Association of Washington Cities. Local Business and Occupation Tax Rates
4
Municipal Research and Services Center. Model B&O Tax Ordinance
5
Washington State Legislature. Washington Code 35.102.040 – Mandatory Provisions of Model Ordinance
6
City of Bellevue. Business and Occupation Tax Guide
7
City of Seattle. Multiple Activities Tax Credit (MATC)
8
City of Seattle. Exemptions from the Business License Tax
9
FileLocal. FileLocal – Frequently Asked Questions
10
Washington Department of Revenue. Filing Frequencies and Due Dates
11
Washington Department of Revenue. Convenience Stores – Record Keeping Requirements
12
Washington Department of Revenue. Penalty Waivers