Excise Tax Laws: Title 82, Revised Code of Washington (RCW) and miscellaneous ancillary tax laws. Our free online guide for business owners covers Washington sales tax registration, collecting, filing, due dates, nexus obligations, and more.Thomson Reuters provides a comprehensive collection of authoritative tax resources, law books, and legal information for tax and accounting attorneys. The Taxation Section provides current information on federal and state tax issues that directly affect practitioners in Washington. Washington state is one of only nine states in the country without a personal income tax, and property taxes are capped at 1 percent of a home's value. Washington Law Books. Find Washington law resources covering state-specific laws, rules and case law. Visit the District's new online tax portal to view and pay your taxes. For many tax types, you can even file. Excise Tax Documents to download and complete are available on the Washington State Department of Revenue website.