Washington state has a 6.5% sales tax, with local rates ranging from 0.5% to 4.1%, resulting in an average combined rate of 9.38%. Economic nexus is triggered at $100,000 in sales, and the tax applies to tangible goods, specified services, and digital products. Retailers must use location-based tools to determine the correct combined tax rate. Exemptions exist for various categories, including farm products and certain services. Physical nexus is established through physical presence like employees or property within the state.
Source: vatabout.com
Note that this post was (partially) written with the help of AI. It is always useful to review the original source material, and where needed to obtain (local) advice from a specialist.