The Washington Financial Declaration is a document required by the Washington State Department of Revenue in order to file taxes. The Washington Financial Declaration is used to report income, deductions, and credits, and to calculate and declare an individual's or business's total tax liability. There are four different types of Washington Financial Declarations: Individual Declaration, Business Declaration, Nonresident Declaration, and Estate Declaration. The Individual Declaration is used to report income and expenses for individuals, while the Business Declaration is used to report income and expenses for businesses. The Nonresident Declaration is used to report income and expenses for nonresidents of Washington State, and the Estate Declaration is used to report income and expenses for deceased individuals.