City business license guide
Last updated: April 28, 2026
Starting in Seattle means checking several layers. The main city step is the Seattle business license tax certificate. The City also calls it a business license or general business license. That certificate does not cover every permit.
This guide explains the city, county, state, and federal steps in plain English. Use it before you open, lease space, sell from home, hire, add a sign, sell food, or use public space.
Bottom line
Most businesses doing business in Seattle need a Seattle business license tax certificate. Seattle directs owners to apply or renew through FileLocal, where the city certificate is called a general business license. The certificate expires December 31 and is renewed each year.
Also check zoning, activity permits, Washington State registration, and any federal steps that fit your business.
Quick start: what to check first
- Describe the business. Write down what you sell, where the work happens, whether customers visit, and whether food, alcohol, vehicles, signs, employees, or regulated services are involved.
- Check the Seattle certificate. Many retail, service, wholesale, professional, manufacturing, nonprofit, online, and home businesses need the city business license tax certificate.
- Check zoning before a lease. A space that worked for one use may need review before a different use.
- Check King County if food, plumbing, gas, or health rules are involved. County permits can apply inside Seattle.
- Check Washington State registration. You may need a state business license, trade name, tax account, employer account, or entity filing.
- Check federal steps. Many owners need an EIN. Some industries need federal permits.
If you are unsure whether a license may apply, start with our guide to do you need a business license, then come back here.
Seattle business license facts box
| Topic | Seattle detail | What to check |
|---|---|---|
| Main city requirement | Seattle business license tax certificate, also called a business license or general business license | Apply or renew through FileLocal or by mail using the current city process. |
| City office | Seattle Department of Finance and Administrative Services, License and Tax Administration | Use the city finance pages for license and tax questions. |
| Renewal | Annual renewal | The City says certificates expire December 31 and are renewed each year. |
| Small exemption | Possible certificate exemption | Seattle says a business may be exempt if annual Seattle gross income is $2,000 or less and it has no place of business in the city. Special permits can still apply. |
| City tax layer | Seattle business and occupation tax | Seattle B&O tax is separate from Washington State B&O tax. |
| County layer | King County activity permits | Food, plumbing, gas piping, and health permits may matter. |
What does this mean for me?
If you do business in Seattle, plan on a city license check early. A freelancer in a Seattle apartment, a shop in Ballard, a contractor doing work in the city, a nonprofit, and an online seller can all have different extra steps. Many still start with the Seattle business license tax certificate.
The city certificate does not approve your location, food operation, sign, fire setup, trade name, state tax account, professional license, or federal permit. It is one local piece, not full approval.
Home-based owners should also check Seattle rules. For a wider overview, see whether you can run a business from home, then confirm Seattle rules for your address.
City, county, state, and federal license layers
City of Seattle requirements
Seattle’s main local requirement is the business license tax certificate. The City says anyone doing business in Seattle must have one unless an exemption applies. Seattle lists many covered activities, including retail, service, wholesale, professional, manufacturing, home-based, and nonprofit work.
The City says the owner needs the certificate, not each employee. A business based outside Seattle may still need the certificate if it does business in the city. Subcontractors generally need their own certificate instead of relying on the prime contractor.
Seattle also has a city B&O tax layer. The Seattle business tax page says city B&O tax is based on gross income and is separate from Washington State B&O tax. The Seattle Shield B&O changes raised the general city B&O threshold to $2 million; filing or reporting can still apply.
King County requirements
King County is separate from Seattle. The county says its own general business licenses apply only to certain business types in unincorporated King County. A business inside Seattle should not assume it needs a King County general business license.
County activity permits can still matter. Public Health – Seattle & King County handles many food business permits, including permanent food businesses, mobile food vehicles, temporary food events, caterers, and commissaries. King County also handles certain plumbing and gas piping permits in Seattle.
Washington State requirements
Washington State may require a state business license through the Department of Revenue. Registration may apply if you have gross income of $12,000 or more, hire employees, collect sales tax, use a trade name, need an endorsement handled by the state system, or owe state taxes or fees. Start with the Department of Revenue page to apply for a business license.
If you form an LLC, corporation, nonprofit corporation, or other entity, you may need to file with the Washington Secretary of State before the state Business License Application. Use the Secretary of State page to start or register a business. If you use a public name that is not your legal name or entity name, check Washington trade name rules.
If you hire workers, Washington says you use the state business licensing process to add hiring employees. Start with the Department of Revenue page on hiring employees so the right state employer accounts can be set up.
Federal requirements
Many businesses need an EIN from the IRS, especially if they hire employees, operate as a partnership or corporation, or meet other IRS triggers. The IRS says you can get an EIN directly from the IRS for free.
Some industries need a federal permit. The SBA says federal permits may apply when the federal government regulates the activity. Examples can include alcohol, aviation, broadcasting, firearms, fish and wildlife, commercial fisheries, maritime transportation, mining, nuclear energy, and some transportation work. Check the SBA page on licenses and permits and then the specific agency.
BOI reporting has changed. FinCEN removed BOI reporting for U.S.-created companies and U.S. persons under an interim final rule. Foreign reporting companies should check FinCEN’s BOI notice.
Private platform rules
Private platforms are not government agencies. Marketplaces, apps, landlords, and insurers may ask for license, tax, or insurance proof, but those rules do not replace official requirements. For online sellers, our online business license guide can help.
Costs you can plan for
Use these as planning points only. Official fee pages control. Extra endorsements, inspections, reviews, construction, late fees, or agency fees can change the total.
| Cost item | Verified detail as of May 1, 2026 | Where to confirm |
|---|---|---|
| Seattle business license tax certificate | For 2026, Seattle lists annual fees by taxable revenue: $73 for $0-$19,999; $147 for $20,000-$499,999; $667 for $500,000-$1,999,999; $1,604 for $2,000,000-$4,999,999; and $3,210 for $5,000,000 or more. Branch locations are listed at $10 each. | Seattle business license page |
| Late renewal penalties | Seattle lists no penalty if renewed by December 31 or during January, $10 in February, and $20 on March 1 or later. | Seattle business license page |
| Washington Business License Application fee | The Department of Revenue lists a nonrefundable $50 processing fee to open or reopen a business, $10 for many other purposes, and a $5 annual renewal processing fee. | Washington processing fees |
| Washington trade name | The state lists $5 per trade name, plus processing fees, when filing through the Business License Application. | Washington trade name page |
| Secretary of State entity filing | The Secretary of State fee schedule lists many common entity filings. For example, an LLC original filing and profit corporation original filing are listed at $180, and many profit annual reports are listed at $70. | Secretary of State fee schedule |
| IRS EIN | The IRS says an EIN is free when obtained directly from the IRS. | IRS EIN page |
Do not budget only for the basic certificate. Restaurants, food carts, buildouts, signs, vending, fire-risk work, and regulated businesses can have extra costs.
Zoning, home occupation, building, fire, sign, and industry permits
Zoning and building use
Zoning comes before the lease. Seattle’s Department of Construction and Inspections says a new business in a space it did not previously occupy may need several permits. A use change can also trigger review. Seattle’s new businesses permit page points owners to zoning, use, construction, utilities, food, fire, and occupancy checks.
Seattle’s zoning page explains that zoning controls land use and development standards. Check the approved use, ask the landlord for records, and contact SDCI if the space or activity is unclear.
Home businesses
Seattle allows many home businesses, but the home must still act like a home. The City’s home business rules say the operator must live in the unit, signs are limited, and the business cannot create noise, odors, emissions, or other impacts at the property line. If you are unsure, read our guide to the home occupation permit concept and then check Seattle’s local code.
Permit trigger table
| Situation | Office to check | Why it matters |
|---|---|---|
| Opening in a leased storefront, office, studio, shop, or warehouse | Seattle Department of Construction and Inspections | Zoning, use, occupancy, construction, electrical, mechanical, or accessibility review may apply. |
| Changing the use of a space | Seattle Department of Construction and Inspections | Seattle may require a permit to establish use or a construction permit. |
| Selling, preparing, storing, catering, or serving food | Public Health – Seattle & King County | Food permits, plan review, commissary rules, and inspections may apply. |
| Vending from a sidewalk, curb space, route, stadium area, or public right-of-way | Seattle Department of Transportation | The vending permit page lists public place vending permit types and related steps. |
| Cooking with propane, hosting assemblies, storing hazardous materials, or doing hot work | Seattle Fire Department | The Fire Department lists fire permits for certain operations, activities, materials, and events. |
| Installing or changing a business sign or awning | Seattle Department of Construction and Inspections, and sometimes SDOT | The City’s sign permit rules can apply to new, altered, lighted, electrical, awning, or right-of-way signs. |
| Operating a city-regulated business type | Seattle Business Regulations | The City says some activities need a regulatory endorsement in addition to the standard city certificate. |
Seattle’s business regulations pages list regulated activities such as short-term rentals, used goods, adult entertainment, parking garages, recycling, alarms, taxis, for-hire items, and other activities.
Real-world examples
Freelance designer working from a Seattle apartment
Check the Seattle certificate, city B&O filing duties, home business rules, and Washington State registration triggers. The stack may be lighter if there are no employees, food, signs, storefront, or buildout.
Coffee shop taking over a former retail space
Check the city certificate, zoning and change-of-use rules, SDCI permits, King County food permit and plan review, plumbing permits if fixtures change, sign permits, and fire items.
Food truck parking on private property and vending on the street
You may need the city certificate, King County mobile food permit, SDOT vending permit, Fire Marshal permit if propane cooking is used, and private-property zoning checks. See our broader guide to food truck permits for common layers.
Common mistakes to avoid
- Confusing the Seattle certificate with the Washington State business license. They are different layers.
- Signing a lease before checking zoning and approved use. A space may not be approved for your plan.
- Assuming a home business has no local rules. Seattle home occupation limits still matter.
- Forgetting annual renewal. Seattle says city certificates expire December 31.
- Thinking the city certificate covers food, fire, signs, or street vending. These often need separate checks.
- Using a trade name without checking state registration. Washington may require trade name registration.
- Ignoring employer accounts. Hiring in Washington can trigger workers’ compensation, unemployment, wage records, and safety duties.
A compact compliance checklist
- Business name and owner or entity are clear.
- Secretary of State filing is checked if you form or register an entity.
- Washington State business license and tax account are checked through DOR.
- Trade name is registered if you use a public name that is not your legal name or entity name.
- Seattle business license tax certificate is applied for or renewed.
- Seattle B&O tax filing duties are checked.
- Zoning and approved use are checked before a lease or opening.
- Home business rules are checked if you work from a residence.
- King County food, health, plumbing, or gas permits are checked if relevant.
- Fire, sign, street use, vending, and regulated business permits are checked if relevant.
- IRS EIN and federal permits are checked if relevant.
Phone and email scripts
Before contacting an agency, have your business name, owner, Seattle address or service area, start date, activity, and business setup ready.
Seattle license and tax script
Hello, I am starting a [business type] in Seattle at [address or area]. I want to confirm whether I need the Seattle business license tax certificate, whether city B&O filing applies, and whether my activity needs a regulatory endorsement.
Seattle License and Tax Administration lists tax@seattle.gov and 206-684-8484 for license and tax questions.
Zoning or use script
Hello, I plan to operate a [business type] at [address]. The last known use was [prior use, if known]. Do I need zoning review, a change-of-use permit, a construction permit, occupancy review, or sign review before opening?
SDCI lists 206-684-8600 and online question options on its resources page.
King County food or health script
Hello, I want to operate a [food activity] in Seattle. Do I need plan review, a permanent or mobile food permit, a commissary agreement, a pre-opening inspection, or plumbing review before I open?
Public Health – Seattle & King County lists food permit and plan review contact options on its food permit pages.
Washington State registration script
Hello, I am starting a [business type] in Seattle. I expect [estimated revenue], will [sell taxable goods or services / not sell taxable goods or services], will [hire / not hire] employees, and may use the trade name [name]. Which state licensing, tax, trade name, or employer steps should I check?
Use the Department of Revenue business licensing pages for state registration questions.
What to do if this does not work
If a portal does not answer your question, send a short written message to the agency and save the reply. Include the address, activity, customer visits, employee plans, food or alcohol details, and any public right-of-way use.
If one office seems to conflict with another, ask which office controls that issue. Seattle may control zoning and the city certificate. King County may control food or plumbing. Washington State may control tax registration or trade names. Private rules do not replace official rules.
Official resources for Seattle business owners
About BusinessLicenseGuide.com
BusinessLicenseGuide.com is a plain-English licensing guide for ordinary small-business owners. We are not a law firm, CPA firm, filing company, government agency, or permit expediter. We help you map the main license, permit, tax, zoning, and agency layers.
FAQ
Does Seattle require a business license?
Most businesses doing business in Seattle need a Seattle business license tax certificate. The City also calls it a business license or general business license. A small exemption may apply if your annual Seattle gross income is $2,000 or less and you do not have a place of business in the city. Regulatory licenses and special permits can still apply.
Where do I apply for a Seattle business license tax certificate?
Seattle directs business owners to apply or renew online through FileLocal, or by mail using the current city application. In FileLocal, the Seattle business license tax certificate is called a general business license.
Do I need a Washington State business license too?
You may need a Washington State business license through the Department of Revenue if you meet state registration triggers, such as gross income of $12,000 or more, hiring employees, collecting sales tax, using a trade name, or needing a state, county, or city endorsement.
Does King County issue a general business license for Seattle businesses?
King County says its business licenses apply only to certain business types in unincorporated King County. A business inside Seattle should still check King County permits that may apply by activity, such as food, plumbing, gas piping, and health permits.
Do home businesses in Seattle need to check zoning?
Yes. Seattle allows home businesses only when they follow home occupation rules, such as living in the unit, keeping the home residential in character, limiting signs, and avoiding noise, odors, or other impacts at the property line.
Do online businesses in Seattle need the city certificate?
Sometimes. Seattle says online-only businesses should contact the City if the business starts from Seattle or has servers in city limits. Many home-based and online businesses still need the Seattle business license tax certificate.
Disclaimer
This article is informational only. It is not legal, tax, financial, insurance, employment, safety, zoning, licensing, or professional advice. Rules, fees, forms, links, offices, and policies can change. Confirm important details with the official agency or a qualified professional. We do not guarantee approval, eligibility, compliance, savings, income, speed, or results.
Update notes
Last updated: April 28, 2026
Next review: August 28, 2026
This update checked Seattle city licensing, B&O tax, zoning, home business rules, King County permit layers, Washington State registration, and federal starting points.