Property taxes are up in Wisconsin because the legislature did not increase K-12 funding to keep pace with the revenue limit increase. The Republicans who control the legislature only want to increase K-12 funding when the revenue limit is flat, which turns the "K-12 funding" into a property tax cut

Republicans move to undo Tony Evers' 400-year school revenue maneuver
Republicans on the Legislature's Joint Finance Committee voted to undo a 400-year extension of school revenue limits enacted by Gov. Tony Evers.