This database provides public information for businesses registered in Washington State. It is a free service provided for informational purposes only. A business must register with the Department of Revenue if it is required to collect sales tax, its gross income is $12,000 per year or more, it's required to pay taxes or fees to the Department of Revenue, or if it is a buyer or processor of specialty wood products. To register a business with the Department of Revenue and other state agencies, file a Business License Application. Once registered, your business will receive a business license and Unified Business Identifier (UBI) number from the Business Licensing Service. You will also receive a letter from the Department of Revenue with a UBI/tax registration number and filing frequency.