Destination-based sales tax tools

Tax rate lookup tool

  • Street address
  • ZIP + 4
  • Map
  • Latitude/longitude

The tool has a tax calculator function that provides the tax amount, total and a confirmation code.

With the exception of the map and calculator features, this tool is also accessible by handheld devices such as PDAs, Blackberries and cell phones at

Tax rate lookup mobile app for iOS and Android

Washington Sales Tax Rate Lookup User Interface

The URL Interface provides a direct access to the Washington Department of Revenue’s address based rate lookup technology platform. Using the URL interface we provide, you can access sales and use tax rate data using address or ZIP + 4 code information and tie the data into your shopping cart checkout process or accounting system in real time.

City and county tax rates

Sales and use tax rates and location codes available in a variety of online, downloadable formats.

Customer database conversion service

Allows businesses to submit their customer address database and receive the location code and sales tax rate for each address.

Excel workbook

A downloadable tax calculator workbook using Microsoft Excel that displays tax rates and location codes, calculates totals, and summarizes sales by city or county without an online connection.

Downloadable databases

Downloadable databases of addresses and tax jurisdictions that businesses can integrate into accounting systems, available by:

Washington Sales Tax Rate Library (Source Code)

Source code that provides a sales tax rate lookup using the Department's address and rate download files.

Certified Service Providers (CSPs)

Companies that help determine sales tax rates and file returns for you.