Concerning rental income received by people eligible for certain property tax exemption programs.

HB 1040 allows people eligible for Washington’s property tax exemption programs (for seniors or disabled residents) to exclude up to $6,000 annually in rental income from their primary residence when calculating income eligibility for the exemption. This applies only to long-term rentals (not short-term rentals like Airbnb, which must still be reported as taxable income). The bill amends existing tax code to include rental income as part of "combined disposable income" calculations, adjusting how income thresholds are applied. It directly affects low-income homeowners in qualifying exemption programs who rent out space in their primary home.