Relating to tax treatment of mortgage interest; prescribing an effective date.

Disallows, for purposes of personal income taxation, the mortgage interest deduction for a residence other than the taxpayer's principal residence, unless the taxpayer sells the residence or actively markets the residence for sale. Phases out the allowable deduction for the interest for a principal residence based upon income. Disallows a deduction for a principal residence above the threshold income amount. Establishes the Oregon Housing Opportunity Account. Transfers an amount equal to the estimated increase in revenue attributable to restrictions on the deduction of mortgage interest to the account. Applies to tax years beginning on or after January 1, 2026. Takes effect on the 91st day following adjournment sine die.