Wisconsin Stock Options Tax: 7.65% Top Rate, 30% LTCG Exclusion, and No State AMT in 2026

Wisconsin's 7.65% top income tax rate looks expensive on a rate card — until you account for the 30% long-term capital gains exclusion. Under Wisconsin Statute §71.05(26), 30% of net long-term capital gains from assets held more than one year are excluded from Wisconsin taxable income.² For an ISO holder who holds shares long enough for a qualifying disposition, the effective Wisconsin rate is not 7.65% but rather 7.65% × 70% = 5.355%. On a $1M qualifying-disposition gain, that's $53,550 in Wisconsin state tax — compared to $133,000 in California (13.3%), $98,500 in neighboring Minnesota (9.85%), and $49,500 in Illinois (4.95%). The LTCG exclusion doesn't help NQSO exercises or disqualifying dispositions, but for ISO holders who play the long game it reshapes the state-tax calculus meaningfully.

Wisconsin also eliminated its state alternative minimum tax after tax year 2018.⁴ ISO holders in Wisconsin face only federal AMT (Form 6251) — there is no Wisconsin-level AMT surcharge on top of federal exposure, unlike California (7% state AMT), Colorado (3.47%), or Connecticut. And Wisconsin follows federal ISO treatment at exercise: because Wisconsin individual income tax starts from federal adjusted gross income under Wis. Stat. §71.01, and ISO exercise spreads do not appear in federal AGI, Wisconsin imposes no income tax when you exercise ISOs.³ This places Wisconsin alongside New York, Illinois, Massachusetts, Georgia, and Ohio — and in sharp contrast with California and Pennsylvania, both of which treat ISO spreads as ordinary income at exercise.

On QSBS, Wisconsin explicitly adopted the OBBBA-enhanced §1202 provisions in the 2025-27 biennial budget (2025 Act 15, signed August 2025).⁵ The OBBBA tiered exclusion ($15M cap, 50/75/100% at 3/4/5 years, $75M gross asset limit) applies for Wisconsin — unlike California (which has never conformed to §1202), Oregon (which decoupled from §1202 effective January 1, 2026), and Pennsylvania (no §1202 conformity). Wisconsin also maintains its own "Qualified Wisconsin Business" capital gain exclusion — a potentially 100% exclusion for gains from DOR-registered Wisconsin businesses held five or more years, separate from and stackable with federal §1202 analysis for certain in-state investments.⁶

Wisconsin Income Tax Rates in 2026

Wisconsin imposes a four-bracket progressive individual income tax under Wis. Stat. Chapter 71. The top rate of 7.65% applies to taxable income above $323,290 for single filers and above $431,060 for married filing jointly.¹ Most tech employees with significant stock option exercises will land in the top bracket. The 2025 Wisconsin biennial budget (2025 Act 15, signed August 2025) expanded the second-lowest bracket — the 4.4% bracket now applies through $50,480 (single) and $67,300 (MFJ), effective retroactively for tax year 2025 — meaning the 5.3% rate doesn't apply until income exceeds those thresholds. For employees in large option exercise years, this bracket expansion has minimal impact (they'll be deep in the 7.65% bracket regardless), but it reduces the effective rate on base salary.

Wisconsin individual income tax starts from federal adjusted gross income, then applies Wisconsin-specific additions and deductions (Wis. Stat. §71.01).³ This federal-AGI starting point is the foundation of Wisconsin's favorable ISO treatment and QSBS conformity. Wisconsin brackets are adjusted annually for inflation; the thresholds above reflect 2025 tax year. Check the Wisconsin DOR (revenue.wi.gov) for 2026-year thresholds when filing estimated tax payments.

ISO Treatment in Wisconsin: No Income at Exercise

When you exercise an ISO, the spread between the exercise price and the fair market value of the stock is an AMT preference item under IRC §56(b)(3) — it appears on federal Form 6251 but does not appear in your federal adjusted gross income. Because Wisconsin individual income tax starts from federal AGI under Wis. Stat. §71.01, and Wisconsin does not add back ISO spreads as a Wisconsin modification item, Wisconsin imposes no income tax when you exercise ISOs.³

This favorable treatment applies whether you're exercising ISOs at a public company (Exact Sciences, Fiserv, Rockwell Automation, Generac) or exercising early at a pre-IPO Madison startup. Wisconsin's ISO treatment at exercise puts it in the same favorable column as New York, Illinois, Massachusetts, Georgia, Virginia, and Ohio — and contrasts sharply with California (FTB Publication 1004: ISO spread is ordinary income for CA purposes, up to 13.3%) and Pennsylvania (same treatment, 3.07%).

ISO qualifying disposition in Wisconsin

A qualifying ISO disposition requires holding shares at least two years from the grant date and at least one year from the exercise date (IRC §422(a)(1)). At the federal level, qualifying dispositions generate long-term capital gain. In Wisconsin, that long-term capital gain qualifies for the 30% LTCG exclusion under Wis. Stat. §71.05(26).² The effective Wisconsin rate on qualifying ISO gains is therefore 7.65% × 70% = 5.355%. On a $2M qualifying-disposition gain, Wisconsin state tax is approximately $107,100 — compared to $266,000 in California and $197,000 in Minnesota. The exclusion does not apply at the federal level; your federal rate on the gain is governed by federal LTCG brackets (0%/15%/20%) and the 3.8% NIIT.

ISO disqualifying disposition in Wisconsin

A disqualifying disposition — selling shares before meeting both the two-year and one-year holding requirements — converts the bargain element to ordinary income on your federal W-2. Wisconsin taxes that ordinary income at the applicable bracket rate, up to 7.65%. The 30% LTCG exclusion does not apply to disqualifying dispositions, because they generate ordinary income rather than long-term capital gains. This creates a more pronounced qualifying-vs-disqualifying incentive in Wisconsin than in flat-rate states: the state-level difference between a qualifying disposition (5.355% effective) and a disqualifying disposition (7.65%) is 2.295 percentage points — approximately $22,950 per million dollars of ISO gain. In flat-rate states like Illinois (4.95% either way) or Ohio (2.75% either way), there's no state-level differential.

The 30% Wisconsin Long-Term Capital Gains Exclusion

Wisconsin allows a deduction of 30% of net long-term capital gains from assets held more than one year, reported on Wisconsin Schedule WD under Wis. Stat. §71.05(26).² For farm assets held more than one year, the exclusion is 60%. This exclusion applies directly on the Wisconsin income tax return and reduces Wisconsin taxable income — so only 70% of net long-term gains flow through to Wisconsin tax at the applicable bracket rate.

For stock option holders, the exclusion applies to:

• ISO qualifying-disposition gains (LTCG at the federal level)
• Post-exercise gains on NQSO shares held more than one year after exercise (the gain above exercise-date FMV)
• Post-exercise gains on ISO shares from disqualifying dispositions to the extent attributable to appreciation above exercise-date FMV and held more than one year (this requires careful tracking)
• Qualifying ESPP dispositions (to the extent LTCG at federal level)

The 30% exclusion does not apply to:

• NQSO exercise spreads (W-2 ordinary income at exercise)
• ISO exercise spreads if they trigger a disqualifying disposition before the one-year holding period
• Short-term capital gains (assets held one year or less)
• RSU vesting income (ordinary compensation income)

NQSO Treatment in Wisconsin

Nonqualified stock option exercises generate W-2 ordinary income. The spread between your strike price and the fair market value at exercise is reported as wages on your federal W-2, subject to income tax (federal + Wisconsin) and FICA at exercise. Wisconsin taxes this ordinary income at rates up to 7.65%.¹ Any subsequent appreciation on the shares from exercise price to sale, if held more than one year, qualifies for the 30% LTCG exclusion — but the exercise spread itself does not.

No Wisconsin State AMT: Full Federal AMT Zone Available

Wisconsin abolished its state alternative minimum tax after tax year 2018.⁴ The Schedule MT (Wisconsin AMT) was last required for TY2018 returns; it no longer exists for 2026. Wisconsin ISO holders face only federal AMT exposure — the ISO spread as an AMT preference item on federal Form 6251, computed against the 2026 federal AMT exemption ($90,100 single / $140,200 MFJ, per OBBBA phaseout framework).

The practical effect: Wisconsin residents can use their full federal AMT safe zone without worrying about an additional Wisconsin AMT layer. Compare this with:

• Minnesota: 6.75% state AMT on ISO spreads — double-AMT exposure that stacks on top of federal AMT
• California: 7% state AMT on ISO exercise spreads — creates significant additional cost beyond federal AMT, especially for large pre-IPO exercises
• Colorado: 3.47% state AMT, Form DR 0104AMT — adds a third AMT layer for CO residents
• Connecticut: state AMT applies at 5.5% of federal AMTI after limited exemptions

Wisconsin's absence from this list is especially valuable for employees considering large ISO exercises in a single year. A Wisconsin resident can exercise enough ISOs to exhaust their entire federal AMT safe zone without incurring any additional Wisconsin AMT on top — making Wisconsin's effective cost of ISO exercise planning notably lower than Minnesota or California for employees in similar income situations.

QSBS in Wisconsin: Federal §1202 Conformity + OBBBA Provisions

Wisconsin explicitly adopted the OBBBA-enhanced §1202 qualified small business stock provisions in the 2025-27 biennial budget (2025 Act 15, signed August 2025).⁵ The budget specifically incorporated the higher exclusion percentages, the raised per-issuer exclusion cap, and the increased gross asset limit that apply under the OBBBA to qualifying stock acquired after July 4, 2025. This is explicit legislative adoption, not just implied rolling-conformity coverage — Wisconsin proactively brought in the OBBBA §1202 changes.

For Wisconsin residents, the 2026 federal §1202 QSBS framework — 50% exclusion at 3 years, 75% at 4 years, 100% at 5+ years, $15M per-issuer cap, $75M gross asset limit at time of issuance for post-July 4, 2025 stock — applies both federally and for Wisconsin purposes. A Wisconsin startup founder who qualifies for the full $15M federal exclusion under these rules also owes zero Wisconsin state tax on that excluded amount.

The Wisconsin Qualified Business Capital Gain Exclusion — a separate state incentive

Separate from and independent of federal §1202, Wisconsin maintains its own "Qualified Wisconsin Business Capital Gain Exclusion" under Wis. Stat. §71.05(26)(b).⁶ This exclusion potentially allows 100% of long-term capital gains from qualifying Wisconsin businesses to be excluded from Wisconsin taxable income — with no dollar cap analogous to the §1202 per-issuer cap. Requirements:

• The investment must be in a qualified Wisconsin business — certified by the Wisconsin Economic Development Corporation (WEDC) through 2013, or registered with the Wisconsin DOR starting in 2014
• The investment must have been made after December 31, 2010
• Shares must be held for at least five uninterrupted years
• The investor must be an individual, partner, member, or individual shareholder — sole proprietorships and disregarded entities do not qualify

The Qualified Wisconsin Business exclusion applies specifically to gains from Wisconsin-based, WEDC/DOR-registered companies. Bay Area, Seattle, or Austin companies don't qualify — this is a Wisconsin-specific incentive for state economic development. For early employees at Madison biotech, health-tech, or AgTech startups that have registered with the DOR, this exclusion can eliminate Wisconsin state tax on qualifying gains even where federal §1202 might not fully apply (different eligibility rules, different holding periods). Confirm DOR registration status with the company and your tax advisor before relying on this exclusion.

83(b) + QSBS stacking in Wisconsin

The §1202 five-year holding period starts from the stock acquisition date — not the vesting date, not the grant date. Wisconsin startup employees with an early-exercise right at a C-corp startup can start the QSBS clock on day one by exercising at grant and filing an 83(b) election within 30 days. Wisconsin's explicit §1202 conformity means both federal and Wisconsin state tax can be eliminated on up to $15M of qualifying gain per issuer. The 30-day 83(b) window is absolute; missing it forfeits this strategy. See the 83(b) Election Decision Guide for the mechanics.

Nonresident Sourcing: Wisconsin Allocates Option Income to Wisconsin Workdays

Wisconsin taxes nonresidents on Wisconsin-source income. For stock option compensation, Wisconsin uses a workday allocation fraction: Wisconsin workdays during the period from option grant to exercise, divided by total workdays during that same period under the employment contract granting the options.⁹ The allocation applies to both the amount that would have been recognized at exercise (the bargain element) for ISO gains, and directly to W-2 income for NQSO exercises.

Wisconsin-source income = exercise spread × (Wisconsin workdays during grant-to-exercise period ÷ total workdays during grant-to-exercise period)

If you received stock option grants while working in Wisconsin and have since relocated, Wisconsin will assert a Wisconsin-source income claim when you exercise — even if you are now a resident of Texas, Florida, or California. File a Wisconsin nonresident return (Form 1NPR) and pay Wisconsin tax at 7.65% on the Wisconsin-source fraction of the spread (or 5.355% effective for qualifying ISO dispositions).

California-to-Wisconsin relocator trap: CA still follows you

If you relocated from California to Wisconsin and still hold grants that were partially or fully earned while working in California, the California FTB will assert California source income on those grants at exercise — regardless of your current Wisconsin residency. California uses the same grant-to-exercise workday fraction, and California's 13.3% rate makes that sourcing claim far more expensive than Wisconsin's 7.65%. A Wisconsin resident exercising California-era grants may face both Wisconsin resident tax on their Wisconsin-allocated income and California nonresident tax on their California-allocated income. These fractions are based on different periods and do not double-count the same income — but they do stack. Model both states before exercising grants from your California employment.

Six Planning Strategies for Wisconsin Stock Option Holders

1. Actively pursue qualifying disposition status — it's worth more here than in flat-rate states

In states with flat income tax rates (Ohio 2.75%, Illinois 4.95%), choosing qualifying over disqualifying disposition doesn't change the state tax rate — both are taxed the same. In Wisconsin, it does: qualifying disposition gains are long-term capital gains eligible for the 30% exclusion (5.355% effective), while disqualifying dispositions generate ordinary income at the full 7.65%. On a $1M ISO position, that's a $22,950 difference in Wisconsin state tax alone — before counting the federal benefit of LTCG rates. This state-level differential doesn't exist in most states; it reinforces the federal incentive to hold for qualifying status whenever the underlying equity supports it. Use the ISO Qualifying Disposition guide to find your binding constraint date.

2. Use your full federal AMT safe zone — no Wisconsin AMT adds to the cost

Wisconsin eliminated its state AMT after 2018. When you model ISO exercises against your federal AMT safe zone using the ISO Exercise AMT Calculator, the result is your actual total AMT exposure — no Wisconsin AMT layered on top. This gives Wisconsin ISO holders a structural planning advantage over Minnesota employees (6.75% state AMT) and California employees (7% state AMT). A $200K ISO exercise that exactly triggers $15,000 of federal AMT costs a Wisconsin resident just that $15,000 — a California resident pays $15,000 federal AMT plus $14,000 California AMT. Wisconsin's AMT-free status allows for more aggressive annual ISO exercise ladders without the penalty compounding that Minnesota and California holders face.

3. For Wisconsin-based startups: investigate DOR registration and the Qualified Wisconsin Business exclusion

If you're an early employee at a Madison startup or Wisconsin-headquartered growth company, confirm whether the company has registered with the Wisconsin DOR as a Qualified Wisconsin Business. If so — and if you're a shareholder, member, or partner (not a sole proprietor) — you may qualify for the Wisconsin QWB exclusion on long-term gains after a 5-year hold. This exclusion can apply to 100% of Wisconsin-allocated gains from that company, separate from and without the per-issuer cap that limits federal §1202. For a Wisconsin startup that doesn't qualify for federal §1202 (wrong industry, asset limit, or C-corp structure), the Wisconsin QWB exclusion may provide an alternative pathway to Wisconsin-level tax relief. Ask your company's legal counsel whether they've registered, and have a Wisconsin CPA verify your eligibility before planning around this.

4. QSBS stacking with 83(b) election: Wisconsin explicitly adopted OBBBA §1202

Wisconsin's explicit adoption of the OBBBA §1202 provisions in the 2025 biennial budget means the full federal QSBS exclusion framework applies for Wisconsin purposes too. For pre-IPO options at C-corp Wisconsin startups (or qualifying out-of-state startups), an early-exercise + 83(b) election eliminates both federal and Wisconsin state tax on up to $15M of qualifying gain per issuer. At 7.65%, Wisconsin state tax on $15M of QSBS gain would be approximately $765,000 after the 30% LTCG exclusion adjustment — which equals $802,575 in potential Wisconsin state tax savings (7.65% × 70% × $15M) compared to a Wisconsin resident without QSBS coverage. The 30-day 83(b) deadline is absolute — mark it on your calendar the day you exercise, not after.

5. If you relocated out of Wisconsin within the last four years, calculate your sourcing ratio before exercising

Wisconsin's 7.65% nonresident rate means the Wisconsin sourcing claim on a $1M NQSO exercise with a 60% Wisconsin fraction is approximately $45,900 — more significant than Ohio's ($16,500 at 2.75%) but less painful than California's ($79,800 at 13.3%). If you relocated to a zero-income-tax state (Texas, Florida, Nevada), there is no residency credit to offset the Wisconsin nonresident claim. The trade-off calculation: how much does the Wisconsin sourcing fraction decline if you wait 6–12 months? On a 48-month grant-to-exercise period with 30 Wisconsin months, one additional non-Wisconsin month increases the denominator by about 1/48 ≈ 2%, reducing the Wisconsin-source income by approximately $20,000 on a $1M spread. At 7.65%, that's ~$1,530 of avoided Wisconsin tax per waiting month — modest individually, but worth running the numbers before a large exercise event.

6. For post-IPO diversification, Wisconsin's LTCG exclusion changes the lot-selection calculus slightly

In flat-rate states, lot selection decisions are driven entirely by federal considerations (HIFO to minimize federal gain). In Wisconsin, where long-term gains are taxed at 5.355% and short-term/ordinary gains at 7.65%, there's a state-level incentive to ensure lots you're selling have a long-term holding period — not just for federal LTCG rates but for the Wisconsin exclusion too. The differential is 2.295 percentage points (7.65% vs 5.355%) per lot at the Wisconsin level. On a $500K lot sale, that's $11,475 in additional Wisconsin tax for short-term vs. long-term treatment. This doesn't override federal lot-selection strategy, but it reinforces the federal incentive to hold lots past the one-year mark before selling. Use HIFO for federal efficiency; coordinate with the Wisconsin LTCG exclusion to confirm selected lots are long-term held.

1. Wisconsin income tax brackets and rates. Wisconsin has four progressive brackets: 3.50%, 4.40%, 5.30%, and 7.65%. Single filer 2025 brackets: 3.5% ($0–$14,680), 4.4% ($14,680–$50,480), 5.3% ($50,480–$323,290), 7.65% (over $323,290). Married filing jointly: 3.5% ($0–$19,580), 4.4% ($19,580–$67,300), 5.3% ($67,300–$431,060), 7.65% (over $431,060). Brackets adjusted annually for inflation; top rate of 7.65% unchanged. The 4.4% bracket was expanded effective TY2025 under 2025 Act 15. Sources: Wisconsin DOR — Tax Rates (revenue.wi.gov); Tax Foundation: 2026 State Income Tax Rates and Brackets.
2. Wisconsin 30% long-term capital gains exclusion. Wisconsin allows a deduction of 30% of net long-term capital gains from assets held more than one year (60% for farm assets) when computing Wisconsin taxable income, under Wis. Stat. §71.05(26). Reported on Schedule WD. The exclusion reduces Wisconsin taxable income, not the tax itself, so the effective Wisconsin rate on long-term gains at the 7.65% top bracket is 7.65% × 70% = 5.355%. Sources: Wisconsin Schedule WD Instructions 2025 — Revenue.wi.gov; Wisconsin DOR Publication 103: Reporting Capital Gains and Losses.
3. Wisconsin ISO treatment at exercise. Wisconsin individual income tax starts from federal adjusted gross income under Wis. Stat. §71.01. ISO exercise spreads are AMT preference items under IRC §56(b)(3) and do not appear in federal AGI; Wisconsin does not add back ISO spreads as a Wisconsin modification. Accordingly, Wisconsin imposes no income tax when ISOs are exercised. Source: Wis. Stat. §71.01 — Individual Income Tax (Wisconsin Legislature); Wisconsin DOR Publication 122: Tax Information for Part-Year Residents and Nonresidents.
4. Wisconsin state AMT eliminated. Wisconsin's alternative minimum tax (Schedule MT) applied for tax years 2017 and 2018. It was eliminated after TY2018; no Wisconsin individual AMT exists for 2026. This means ISO holders face only federal AMT (Form 6251) when exercising ISOs in Wisconsin. Sources: Wisconsin Schedule MT 2018 (final year Schedule MT was required); Wisconsin DOR: Individual Income Tax (revenue.wi.gov).
5. Wisconsin explicit adoption of OBBBA §1202 QSBS provisions. The 2025-27 Wisconsin biennial budget (2025 Act 15, signed August 2025) specifically incorporated the OBBBA (One Big Beautiful Bill Act, Public Law 119-21) provisions increasing the §1202 QSBS exclusion percentages, raising the per-issuer exclusion cap to $15M, and raising the gross asset limit to $75M for qualifying stock issued after July 4, 2025. Wisconsin's §1202 conformity is both via rolling IRC adoption and this specific statutory adoption. Sources: Wisconsin LFB: 2025-27 Biennial Budget — General Fund Taxes (including QSBS adoption); Keystone Global Partners: QSBS State Tax Treatment — State Conformity Guide.
6. Wisconsin Qualified Wisconsin Business Capital Gain Exclusion. Wis. Stat. §71.05(26)(b) provides an exclusion for long-term capital gains from investments in businesses certified by the Wisconsin Economic Development Corporation (WEDC) or registered with the Wisconsin DOR. Requirements: investment after Dec. 31, 2010; held 5+ uninterrupted years; investor is an individual, partner, member, or shareholder (not sole proprietor or disregarded entity). Claimed on Schedule QI. Source: Wisconsin DOR: Qualified Wisconsin Business Capital Gain Exclusion (revenue.wi.gov).
7. No city income tax in Wisconsin. Wisconsin cities, including Milwaukee, Madison, Appleton, Racine, and Green Bay, do not impose a local income tax on wages, stock option exercises, or capital gains. Milwaukee levies a 2% city sales and use tax; this is a sales tax, not an income tax. Sources: SmartAsset: Wisconsin Income Tax Calculator; Tax Foundation: 2026 Wisconsin Tax Rates and Rankings.
8. 2026 Social Security wage base: $184,500. NQSO exercise spreads are W-2 wages subject to the 6.2% employee Social Security tax up to this limit. Source: SSA.gov — Contribution and Benefit Base 2026.
9. Wisconsin nonresident sourcing of stock option income. Wisconsin taxes nonresidents on Wisconsin-source income. For options granted in connection with employment, the Wisconsin-source fraction equals Wisconsin workdays under the employment contract granting the options divided by total workdays under that contract (grant-to-exercise period). Nonresidents with Wisconsin-source option income file Form 1NPR (Wisconsin Nonresident and Part-Year Resident Income Tax Return). Source: Wisconsin DOR Publication 122: Tax Information for Part-Year Residents and Nonresidents (revenue.wi.gov).

Values verified June 2026. Wisconsin income tax brackets reflect 2025 tax year rates from the Wisconsin Department of Revenue (updated January 16, 2026); 2026 brackets are adjusted annually for inflation with the same four bracket structure and 7.65% top rate. QSBS conformity reflects Wisconsin's adoption of OBBBA §1202 provisions in the 2025-27 biennial budget (2025 Act 15, August 2025); confirm current conformity status with a Wisconsin-licensed tax advisor as Wisconsin tax law changes regularly. AMT elimination confirmed through 2026 (Schedule MT abolished after TY2018). Confirm current-year values and Qualified Wisconsin Business registration status before making irreversible decisions.