Mortgage Interest Deduction in Washington
State income tax rate
None
Itemized deductions allowed
❌ No
State-Level Mortgage Interest Deduction
Washington has no state income tax on wages or salary. It does have a capital gains tax (7% on gains above $1M as of 2025), but that's separate and does not affect mortgage interest deductibility. The federal mortgage interest deduction is your only deduction for mortgage purposes.