MADISON, Wis. — The combined tax levy collected by local governments in Dane County rose 9.9% on December property-tax bills, marking the county’s largest increase since 1992, according to the nonpartisan Wisconsin Policy Forum. The increase comes as Wisconsin’s total local tax levy posted its largest gain in nearly two decades, the forum said. Local levies help fund services provided by municipalities, counties, school districts and other local units of government. The figures are expected to become part of a broader political fight over property taxes and local-government finances. Mark Sommerhauser of the Wisconsin Policy Forum said the increase will likely force policymakers to confront how communities pay for services. “It probably tees up a discussion that’s going to have to be had,” Sommerhauser said. He predicted “a pretty fierce debate” in 2027, when Wisconsin will have a newly elected governor and potentially new lawmakers, over local-government funding and property taxes. The levy growth does not necessarily translate into an identical increase for every property owner. Individual tax bills can also be affected by changes in property values and the distribution of the levy among taxing authorities. Still, a countywide increase of this size can put added pressure on household budgets and sharpen disagreements over public-service costs, state aid and local taxing authority. The data arrive as Wisconsin lawmakers prepare for future debates about the balance between state-level tax policy and the ability of cities, villages, counties and school districts to raise enough money to maintain essential services. Those decisions could shape property-tax bills and local budgets across the state in the years ahead.