Taxes in Janesville
Janesville's tax picture combines Rock County's real, genuinely elevated effective property-tax rate with Wisconsin's real 4-bracket state income tax.
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Learn moreRock County's genuinely elevated property tax
Rock County's effective property tax rate carried a real, disclosed cross-source spread this pass: 1.81% (13.8% above Wisconsin's statewide average, ranking 4th-highest of 72 counties) to 1.96% by a separate calculation.
Wisconsin's 4-bracket state income tax
Wisconsin's real 4-bracket state income tax (3.50% to 7.65% on income over $315,310 for singles, 2026) applies statewide, including in Janesville, with NO local/county piggyback layer.
Confirm current, specific levy details
Confirm current, address-specific school, city, and special-district levies directly with the Rock County Treasurer, since a property's actual effective rate depends on the specific levies serving that address.
Key takeaways
- Rock County's effective property tax rate runs a real, disclosed 1.81%-1.96%, ranking 4th-highest of Wisconsin's 72 counties.
- Wisconsin's flat 4-bracket state income tax applies statewide, including in Janesville, with no local piggyback layer.
- Confirm current, address-specific levy details directly with the Rock County Treasurer.
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