If Jefferson County's annual rate of new construction since 2017 had been 2% – roughly matching St. Croix County's pace – its property tax levy could be $1.9 million larger today without raising rates on current property owners, according to a May 2026 report from the Wisconsin Policy Forum. Over eight years, that higher growth rate would have allowed the county to levy a cumulative $8.4 million more. The comprehensive review examines how more than a decade of lagging construction and population growth has squeezed budgets for local governments and school districts in Jefferson County, a reality the report says is common statewide.

Jefferson County's net new construction rate – the annual percentage increase in property values from new buildings – tells the story of decline. In 2005, the county's rate was 3.1%, closely tracking Wisconsin's 2.8% and inflation at 3.4%. By 2025, Jefferson's rate had fallen to just 0.7% while the state hit nearly 1.7% and inflation stood at 2.6%. Since 2011, the county has frequently trailed both the statewide average and inflation. Population growth collapsed alongside construction: the county added 11.8% more residents between 1990 and 2000, then 10.4% from 2000 to 2010, but only 2.9% between 2010 and 2020 and just 0.82% since 2020. The Wisconsin Department of Administration projects a slight population decline by 2030. As of 2025, Jefferson County's population was 86,855.

The city of Lake Mills stands out as a bright spot, with net new construction typically the highest in Jefferson County over the past 10 years, peaking at 3.5% in 2024 and topping 2% in several other years. Meanwhile, the cities of Jefferson and Fort Atkinson grow more slowly, with rates often below 1% and neither community exceeding 2% in any year since 2015. The report examined a hypothetical 121-home development valued at $50.3 million to show concrete impacts: in the city of Jefferson, such a project built over four years would allow the municipality to levy up to $227,800 more by the end, bringing the levy to $5.5 million. The same development in Lake Mills would produce $155,000 in new allowable levy growth after four years, with the difference due to Lake Mills's lower base tax levy despite similar property values.

The slow development directly constrains local budgets because of how Wisconsin law ties property tax increases to net new construction. For counties, municipalities, and technical college districts, annual property tax increases for operations are essentially limited to the percentage change from new construction, plus debt payments or voter-approved referendums. When lawmakers first approved these levy limits in 2005, higher construction rates made them manageable, and the original limits included a floor of 2% to 3.86% to account for inflation. But that floor was removed in 2011, and the post-Great Recession slowdown has made it much harder for local governments to stay within limits as costs for basic services like fire protection and street maintenance rise with inflation. The report notes that achieving a 2% construction rate would require more than $240 million in property development annually in Jefferson County – a difficult task today, though the county saw rates between 2.4% and 3.3% from 2000 to 2008 before the housing crash.

Development beyond 2% annually would still be challenging. The report notes that only 27% of Wisconsin cities and villages saw that rate of net new construction last year. While local policies matter, economic and demographic factors partly or entirely beyond local control also drive development, including birthrates, migration patterns, highway access, national trends, and the capacity of regional builders. The report frames Jefferson County, nestled between Milwaukee and Madison along Interstate 94, as an effective stand-in for urban and rural communities across Wisconsin facing the same revenue constraints. Ultimately, the report states, this guide is meant to inform the work of local officials across the state, not just in Jefferson County, as they navigate a system where slow growth compounds budget pressures year after year.