Section 20 of article X of the state constitution (TABOR) imposes a limitation on the amount of state fiscal year spending. If state fiscal year spending exceeds that limitation, the state is required to refund the amount of state fiscal year spending in excess of that limitation (TABOR refund). Under current law, if the state issues a TABOR refund for a state fiscal year, and the amount of that TABOR refund is greater than the amount of state fiscal year spending in excess of the limitation of state fiscal year spending for the state fiscal year (over-refund), the state reduces the amount of the next available TABOR refund by the amount of the over-refund.     Changes in federal tax policy in 2025 reduced the amount of state tax revenue for the 2025 tax year. Due to when this change in federal tax policy was signed into law, it was not reflected in the amount of state fiscal year 2024-25 spending, even though the change impacted the 2025 tax year. Accordingly, if the state controller certifies in September 2026 that state revenues for state fiscal year 2025-26 did not exceed the limitation on the amount of state fiscal year spending for that state fiscal year, the bill directs the office of the state controller, in consultation with the office of state planning and budgeting and the department of revenue, to determine the amount of the over-refund for state fiscal year 2024-25 taking into account the impact on state revenues from the federal tax policy change. No more than half of this over-refund can offset future TABOR refunds for any single state fiscal year beginning with the 2026-27 state fiscal year.(Note: Italicized words indicate new material added to the original summary; dashes through words indicate deletions from the original summary.)(Note: This summary applies to the reengrossed version of this bill as introduced in the second house.)