RCW 82A.04.250: Base income—Federal obligations.

In computing a taxpayer's Washington base income, the taxpayer must deduct, to the extent included, from the taxpayer's federal adjusted gross income, any income derived from obligations of the United States that this state is prohibited by federal law from subjecting to a net income tax. However, the amount deducted under this section must be reduced by any expense, including amortizable bond premiums, incurred in the production of such income to the extent the expense has been deducted in calculating federal adjusted gross income.