How to Register for a Sales Tax ID in Washington

To register for what is commonly called a sales tax ID in Washington, submit a Business License Application for state Tax Registration through the Washington Department of Revenue’s Business Licensing Service. Washington does not formally label the credential a separate “Sales Tax ID.” After registration is processed, the business receives a nine-digit Unified Business Identifier (UBI), which may also be described as a tax registration number, business registration number, or business license number.

You can apply online through My DOR or mail the Business License Application to the Business Licensing Service. Before starting, confirm whether your business must register, complete any required entity formation, and gather the ownership, location, revenue, and employee information relevant to your application.

Washington Sales Tax ID Quick Facts

The UBI is broader than the phrase “sales tax ID” may suggest. It identifies the registered business account and may appear under several names in licensing and tax materials. For more context about the identifier, see this overview of the Washington State Sales Tax Number.

Who Must Register in Washington?

Washington State Tax Registration is required when a business meets any one of the state’s listed registration conditions. A business must register if it:

• Sells a product or provides a service that requires sales-tax collection;
• Has annual gross income of at least $12,000;
• Buys or processes specialty wood products; or
• Meets applicable nexus reporting thresholds.

These are independent registration triggers. For example, a business can be required to register because it sells taxable products even if it does not rely on the annual gross-income threshold.

The registration analysis should cover the business’s complete activities rather than its label. Online, retail, service, and mixed-operation businesses may have different facts to report on the application. Sellers can review Washington Sales Tax Registration for Online and Retail Sellers for additional context.

Out-of-state and remote businesses

An out-of-state business must register to report Washington business and occupation (B&O) tax and collect or submit applicable Washington sales tax if it has physical presence nexus, has more than $100,000 in combined Washington-sourced gross receipts in the current or prior year, or is organized or commercially domiciled in Washington.

This means that a business does not necessarily need a traditional Washington storefront before registration becomes relevant. Out-of-state sellers should review both their physical connections to Washington and their Washington-sourced receipts for the current and prior year. Businesses comparing the state’s major tax concepts may also consult Washington B&O Tax vs Washington Sales Tax: A Guide for New Sellers.

What to Prepare Before Applying

Preparing the application details in advance can help keep the legal entity, ownership, and operating information consistent. The exact questions presented in the online Business License Application vary with the ownership structure and circumstances of the business.

Complete entity formation first when required

Corporations, LLCs, liability companies, and limited liability partnerships must file with the Washington Secretary of State before completing the Business License Application for a new business license. Use the entity information established in that filing when completing the state application.

Application preparation checklist

Online applicants should be prepared to provide the following categories of information, as applicable:

• Ownership and identification details: Gather the identifying information requested for the owners or other responsible parties associated with the business.
• Business location: Have the location information for the business’s operations available.
• Business activities: Be ready to describe what the business sells, provides, or does. A clear description helps distinguish among retail sales, services, and other activities.
• Estimated gross revenue: Prepare a reasonable estimate based on the planned or existing operation.
• Employee information: Provide employee-related details when they apply to the business.
• FEIN: Have the federal employer identification number available when it is required or has already been obtained.

Review names, addresses, entity details, and activity descriptions before submission. Consistent information makes it easier to recognize the same business across its formation, licensing, and tax records.

How to Submit the Business License Application

Washington provides online and mail methods for state Tax Registration. In either case, the registration is handled through the Department of Revenue’s Business Licensing Service using the Business License Application.

Apply online through My DOR

1. Make sure any required Secretary of State filing for the entity has been completed.
2. Access My DOR using a SecureAccess Washington (SAW) user ID.
3. Under Business Licensing, select “Apply for a new business license.”
4. Enter the requested ownership, identification, location, activity, estimated revenue, employee, and FEIN information that applies to the business.
5. Review the entries for consistency and complete the submission.

The SAW user ID and the “Apply for a new business license” selection apply specifically to the online application method.

Apply by mail

A business may instead complete the Business License Application and mail it to:

Business Licensing Service
P.O. Box 9034
Olympia, WA 98507-9034

Whichever method is used, treat the application as a broader business-registration filing rather than searching for a form separately titled “Sales Tax ID.” The state Tax Registration and resulting UBI/account ID are the relevant Washington credentials.

Costs and Responsibilities After Registration

The state Tax Registration itself costs $0. However, that does not necessarily make the entire Business License Application free. The application has a variable fee, registering a trade name costs $5, and endorsement fees may be additional. The total therefore depends on what is included with the particular application.

Once the registration is processed, the business receives its UBI/account ID. The Washington Department of Revenue also assigns the business a tax-return filing frequency. Keep the issued identifier and filing-frequency information with the business’s tax and licensing records so they are available when managing the account.

Use the business’s legal name and UBI consistently when working with its Washington registration. If the business uses a trade name, distinguish that name from the underlying legal entity in internal records. Also retain a copy of the submitted application and the information used to describe the business’s activities and estimated revenue.

Registration is the starting point for the Washington tax account, not merely the receipt of a number. Pay attention to the filing frequency assigned by the Department and organize sales, revenue, and other business records around that account information. If the business expands into new activities or locations, compare the updated operation with the information maintained for the registered business.