Relates to the determination of adjusted base proportions in special assessing units which are cities

This bill sets a 5% maximum annual increase for property tax base proportions in cities for fiscal year 2026. It directly affects cities calculating property taxes, requiring their local legislative bodies to set the exact increase (up to 5%) by December 1, 2025. If cities issued tax bills before the law took effect, they must revise those bills and reissue them with updated rates, but taxpayers remain responsible for payments due before the revision. The bill ensures cities can adjust tax calculations within this cap while maintaining prior payment obligations for existing bills.