M&A Advisory in Wisconsin

Wisconsin's signature business tax incentive under Sec. 71.07(5n) provides a non-refundable 7.5% credit on eligible qualified production activities income derived from manufacturing property classified under §70.995 or agricultural property under §70.32(2)(a)4. For 2025–2026, this reduces the effective Wisconsin tax rate on qualifying production income to approximately 0.4% for C-corps (7.9% – 7.5%) and as low as ~0.15% for individuals/pass-through owners at the 7.65% top bracket. Unused credits carry forward up to 15 years and have real buyer value in stock deals.

Wisconsin allows individuals and pass-through owners to subtract 30% of net long-term capital gain on assets held more than one year (Sec. 71.05(6)(b)9), taxing only 70% at ordinary rates and producing a maximum effective state LTCG rate of ~5.36% (70% × 7.65%). For farm assets held more than one year, the exclusion rises to 60% under Sec. 71.05(6)(b)9m, yielding an effective top rate of ~3.06%. SB 45's proposed $400K cap was not enacted — the exclusion remains uncapped for 2025–2026, saving $306,000 on a $20M gain relative to ordinary treatment.

Under Sec. 71.05(25), individuals may completely exclude Wisconsin tax on qualifying gain from an investment in a Qualified Wisconsin Business held at least 5 uninterrupted years. Under Sec. 71.05(26), Wisconsin tax on long-term gain reinvested in a QWB within 180 days may be deferred. Wisconsin fully conforms to federal IRC §1202 QSBS treatment for stock acquired and gains realized after December 31, 2018 (2023 Wisconsin Act 51), including the OBBBA expansion to the $15M cap and $75M gross-asset test — enabling stacking of both federal and state exclusions.

Wisconsin's 2025 progressive single-filer brackets are 3.50% (up to $14,679); 4.40% ($14,680–$50,479 per 2025 Act 15); 5.30% ($50,480–$323,289); and 7.65% (above $323,290). Pass-through entities may elect entity-level taxation at a flat 7.9% under Sec. 71.21(6), preserving the federal SALT-cap workaround. The PTE election is made annually on or before the extended due date of the Wisconsin return with consent of partners/shareholders holding more than 50%. Sellers should model whether the 7.9% PTE rate (federally deductible) outperforms the 7.65% individual top rate in the sale year.

Wisconsin imposes no state estate tax and no state inheritance tax for 2025–2026; the prior estate tax was eliminated effective 2008 and never reinstated. Wisconsin also imposes no separate gift tax. Wisconsin sellers face only federal estate tax (2025 exclusion $13.99M/individual, rising to $15M per person in 2026 under OBBBA), making pre-sale gifting strategies — GRATs, IDGTs, sales to defective grantor trusts — highly effective without the state-level layer that burdens Illinois sellers (16% top rate, $4M non-portable exemption) or Minnesota sellers.

Wisconsin imposes a 5% state sales/use tax plus county local options (typically 0.5%; Milwaukee County 0.9%). Asset deals involving tangible personal property are generally taxable, but the occasional sale exemption under Sec. 77.54(7) and Tax 11.34 can shelter a bulk-asset transfer if the seller properly inactivates its seller's permit before or at closing. Sec. 77.52(18) imposes successor liability on asset-deal buyers for unpaid sales/use tax; buyers must obtain a Sales and Use Tax Clearance Certificate from WI DOR (60–90 days to issue). Manufacturing machinery is exempt from sales tax — proper purchase-price allocation significantly reduces exposure.