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.

HB 3601 modifies property tax rate rules for Texas school districts and other local taxing units like health districts. It requires school districts to lower their tax rates if state/local funding per student increases from the prior year, preventing them from using extra revenue without voter approval. For non-school taxing units, the bill allows tax rate increases approved by two-thirds of voters to bypass standard majority requirements in tax law, and prohibits governing bodies from rejecting such rates solely based on voter approval. These changes directly affect local governments managing property taxes and ensure tax rate adjustments align with funding changes or voter decisions.