Relating to the calculation of certain ad valorem tax rates of a taxing unit and the manner in which a proposed ad valorem tax rate that exceeds the voter-approval tax rate is approved; making conforming changes.

HB 279 modifies how certain Texas taxing units calculate property tax rates. It applies specifically to junior college districts, hospital districts, and other non-school taxing units with proposed maintenance/operations tax rates of 2.5 cents or less per $100 of property value. The bill temporarily treats "foregone revenue" (revenue lost due to property value changes) as zero for these units until the 2026 tax year, simplifying their rate calculations. This change expires December 31, 2028, and affects how these units determine their voter-approval tax rates under state law.