Indiana Stock Options Tax: 2.95% Flat Rate, No State AMT, and the 92-County System in 2026

Indiana imposes a flat income tax of 2.95% on all taxable income in 2026 — the rate dropped from 3.05% in 2025 as part of a multi-year reduction schedule.¹ On top of that state rate, each of Indiana's 92 counties levies its own income tax, creating a layered system where your total tax rate depends on which county you call home on January 1 of the tax year. A Salesforce software engineer in Indianapolis (Marion County) faces a combined 4.97% state-plus-county rate on a NQSO exercise; a counterpart living in Carmel (Hamilton County) faces a lower combined rate of approximately 4.05–4.10%. Both pay dramatically less than a California peer at 13.3%, a New York City peer at 14.776% combined, or even an Illinois peer at a flat 4.95%.

Two Indiana-specific advantages matter most for ISO holders: Indiana has no state alternative minimum tax, and Indiana income tax starts from federal adjusted gross income (IC §6-3-1-3.5) — which means ISO exercise spreads, classified as federal AMT preference items rather than ordinary income, generate no Indiana state or county income tax at exercise.² This puts Indiana in the same favorable category as Illinois, Virginia, Georgia, and Ohio — states where ISO exercise triggers only the federal AMT analysis, not a parallel state tax bill. The contrast with California (ISO spreads taxed as ordinary income under FTB Pub 1004 at up to 13.3%) and Pennsylvania (ISO spreads taxed at exercise at 3.07%) is stark for high-spread ISO exercises.

The third advantage: Indiana updated its Internal Revenue Code conformity date to January 1, 2026 via Senate Bill 243 (signed March 5, 2026).³ Because the OBBBA was enacted July 4, 2025 — before that conformity date — Indiana conforms to OBBBA-enhanced §1202 QSBS exclusions (tiered 50/75/100% at 3/4/5 years, $15M per-issuer cap), unlike California and Oregon, which have decoupled from §1202 entirely. For an Indianapolis startup founder qualifying for a $10M QSBS exclusion, Indiana's conformity saves approximately $497,000 in state and county tax compared to the same outcome in California.

The summary: Indiana is a low-cost state for stock option exercises relative to California, New York, and Massachusetts. For ISO holders specifically, Indiana's combination of no state tax at exercise and no state AMT makes it one of the cleanest income-tax states for pre-IPO exercise planning. The county income tax layer requires county-specific attention — the difference between Marion County (2.02%) and Johnson County (0.85%) is real — but even at 4.97% combined in Indianapolis, Indiana costs far less than California (13.3%) or New York (10.9%).

Indiana Income Tax Rate 2026: 2.95% Flat

Effective January 1, 2026, Indiana's individual income tax rate is 2.95%.¹ This is a reduction from 3.05% in 2025, part of a stepped-down schedule enacted in prior budget legislation. The flat rate applies to all taxable income regardless of amount: a $200,000 NQSO exercise and a $3M NQSO exercise face the same 2.95% state rate. There are no high-earner brackets, surtaxes, or millionaires' taxes in Indiana — unlike Massachusetts (4% surtax above ~$1.08M), Minnesota (1% NII surtax on investment income above $1M), or Maryland (new 2% CG surtax).

Indiana individual income tax starts from federal adjusted gross income, with Indiana-specific additions and deductions applied under Indiana Code §6-3-1-3.5.² This federal AGI starting point is the foundation of Indiana's favorable ISO treatment.

The 92-County Income Tax System: Indiana's Key Complexity

Every Indiana county levies a local income tax, ranging from 0.5% to 3.38% in 2026, and all 92 counties participate.⁴ Indiana county income taxes are residence-based: your county rate is determined by where you live on January 1 of the tax year, not where you work. If you live in Hamilton County (Carmel) but commute to an Indianapolis office in Marion County, you pay Hamilton County's rate — not Marion County's — for the entire year.

Indiana county income taxes apply to the same income base as state income tax — Indiana adjusted gross income, which follows federal AGI. Unlike Ohio city income taxes (which typically apply only to W-2 wages), Indiana county taxes apply broadly to all income in Indiana AGI: NQSO exercise spreads (W-2 income), qualifying ISO disposition gains (capital gain income in federal AGI), post-exercise capital appreciation, and other income. This means the combined state + county rate applies to all stock option events that generate Indiana taxable income, not just W-2 income.

Key 2026 county income tax rates for Indiana's major tech and pharma employment hubs:

*Hamilton County rate based on multiple 2026 sources; confirm current rate at Indiana DOR county rate table before large exercises. County rates are set annually and can change.

ISO Treatment in Indiana: No Ordinary Income at Exercise

Indiana individual income tax starts from federal adjusted gross income (IC §6-3-1-3.5).² When you exercise an ISO, the bargain element — the spread between exercise price and fair market value — does not appear in federal AGI. It is an AMT preference item added to federal alternative minimum taxable income on Form 6251 (IRC §56(b)(3)), but it is not ordinary income on your federal return, and it does not appear in federal AGI. Because Indiana starts from federal AGI without adding back ISO exercise spreads, Indiana imposes no income tax — state or county — when you exercise ISOs.

Indiana also has no state alternative minimum tax.² Unlike Colorado (3.47% state AMT, Form DR 0104AMT), Minnesota (6.75% state AMT on ISO spreads), or Connecticut (piggybacked state AMT), Indiana does not create a parallel AMT calculation for ISO exercises. The only tax exposure at ISO exercise for an Indiana resident is the federal AMT — calculated on Form 6251 with the 2026 exemptions of $90,100 (single) / $140,200 (MFJ) and OBBBA-adjusted phaseout thresholds of $500,000 / $1,000,000.⁵

This combination — federal AGI starting point (no state income at exercise) plus no state AMT — makes Indiana one of the most favorable income-tax states for ISO exercise planning. On a $500,000 ISO exercise spread, the difference in state-level cost between Indiana (no tax at exercise) and California (up to $66,500 state ordinary income + CA AMT) is enormous.

ISO qualifying disposition in Indiana

For a qualifying ISO disposition — shares held at least 2 years from grant date and at least 1 year from exercise date — the entire gain is long-term capital gain at the federal level and in federal AGI. Indiana provides no preferential LTCG rate; qualifying-disposition gains are taxed at Indiana's flat 2.95% plus your county rate.¹ For a Marion County resident, the combined 4.97% rate on a $1M qualifying disposition is $49,700 in state + county tax. That compares to approximately $133,000 in California (13.3%), $109,000 in New York (10.9%), and $49,500 in Illinois (4.95%) — Indiana and Illinois are nearly identical for qualifying-disposition holders, with Indiana's county taxes slightly more or less than Illinois depending on county.

ISO disqualifying disposition in Indiana

A disqualifying disposition converts the ISO bargain element to W-2 ordinary income. Indiana taxes that W-2 income at the flat 2.95% state rate plus the county rate applicable to your residence on January 1. The gain above the FMV at exercise is capital gain, also taxed at 2.95% + county rate. For Indiana residents, the entire qualifying-vs-disqualifying decision is driven primarily by federal tax considerations — the roughly 17–22 percentage-point federal rate difference between LTCG (20%) and ordinary income (37% or 32%). Indiana's flat state rate creates no additional state-level incentive to prefer one path over the other.

NQSO Treatment in Indiana: State + County Rates Stack

Nonqualified stock option exercises are W-2 income. The spread between strike price and FMV at exercise is reported on your W-2 as ordinary compensation and is subject to Indiana income tax at 2.95%, plus the income tax of your residence county. Any capital appreciation after exercise is also taxable at 2.95% + county rate when realized.

No Long-Term Capital Gains Preference in Indiana

Indiana does not offer a preferential state rate for long-term capital gains. All capital gains — short-term and long-term, from ISOs, NQSOs, RSUs, and other sources — are taxed at Indiana's flat 2.95% plus county rate.¹ There is no holding-period incentive at the Indiana state level. The entire leverage in the qualifying-vs-disqualifying ISO decision for Indiana residents operates at the federal level.

For comparison: Arizona taxes long-term capital gains at an effective 1.875% (SB 1331); Wisconsin's 30% LTCG exclusion creates an effective 5.355% rate on qualifying dispositions. Indiana's 2.95% flat rate is low in absolute terms and doesn't vary by asset type. For practical purposes, Indiana residents should optimize ISO and NQSO timing decisions based on federal bracket management — the Indiana tax is small and constant regardless of holding period.

QSBS in Indiana: Conformity via SB 243

Indiana Senate Bill 243, signed March 5, 2026, updated Indiana's Internal Revenue Code conformity date from January 1, 2023 to January 1, 2026.³ The OBBBA was enacted July 4, 2025 — inside that conformity window — meaning Indiana incorporates OBBBA amendments to the IRC, including the enhanced §1202 QSBS exclusion rules. SB 243 specifically decouples Indiana from §168(k) and §168(n) (bonus depreciation), §163(j) (business interest expense limitations), and §174/174A (R&E expenditures) — these are business and corporate provisions. Section 1202 is not among the decoupled provisions, so Indiana's conformity to OBBBA §1202 follows from the updated conformity date.

Because Indiana income tax starts from federal AGI, and §1202-excluded QSBS gain does not appear in federal gross income (and therefore not in federal AGI), Indiana imposes no state income tax on federally excluded QSBS gains. The OBBBA-era §1202 rules for stock issued after July 4, 2025: 50% exclusion at 3 years, 75% at 4 years, 100% at 5+ years; $15M per-issuer cap; $75M gross asset test at issuance. Indiana startup founders and early employees who structure early exercises with 83(b) elections can potentially eliminate both federal and Indiana state tax on up to $15M of qualifying gain per issuer.

Nonresident Sourcing: Indiana Allocates Option Income by Workdays

Indiana taxes nonresidents on Indiana-source income under IC §6-3-2-2.7,⁷ with stock option compensation sourced using a workday fraction: Indiana workdays during the grant-to-exercise (or grant-to-vesting) period divided by total workdays during the same period. The standard formula:

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

If you received option grants while working in Indiana and have since relocated to another state, Indiana will assert a claim on the Indiana-source fraction of your exercise spread when you exercise. Nonresidents with Indiana-source income file Indiana Form IT-40PNR.

California-to-Indiana relocator: California still follows you

If you relocated from California to Indiana and hold grants earned during your California employment period, the California FTB will assert California source income on those grants when you exercise — regardless of your current Indiana residence. California uses the same grant-to-exercise workday fraction, and California's 13.3% rate makes the California sourcing claim far more expensive than Indiana's 2.95%. An Indiana resident exercising California-era grants may owe Indiana tax (2.95% on the Indiana-source fraction post-move) and California nonresident tax (up to 13.3% on the CA-source fraction). Model both states' claims before exercising grants from your California employment period. The California exposure, not the Indiana one, is the binding constraint.

Six Planning Strategies for Indiana Stock Option Holders

1. Use Indiana's clean ISO environment — no state AMT, no state income at exercise

Indiana is one of the most favorable income-tax states for pre-IPO ISO exercise planning. You face only the federal AMT calculation — use the ISO AMT Calculator to find your safe exercise zone (the maximum spread exercisable without triggering federal AMT). Unlike California, where ISO exercises face both CA ordinary income tax (up to 13.3%) and CA AMT (7%), Indiana residents face only the federal AMT. This means your annual AMT safe zone translates directly into exercise capacity, without a parallel state tax bill compressing your planning room. Multi-year ISO exercise ladders that stay within the federal safe zone each year can convert large pre-IPO positions into LTCG territory at modest Indiana tax cost.

2. Know your January 1 county and plan around it for major exercise years

Your Indiana county income tax rate for the entire calendar year is locked in by your residence on January 1. If you have significant option exercises planned for 2027 and you currently live in Marion County (2.02%), consider whether relocating to a lower-rate county — Johnson County (0.85%), Hamilton County (~1.10%) — before December 31 of the preceding year makes sense. On a $1M exercise, the difference between Marion County (2.02% → $20,200 county tax) and Johnson County (0.85% → $8,500) is $11,700. The break-even depends on your exercise timeline, housing situation, and whether the lower-rate county is otherwise appealing. But the opportunity is real and the calculation is straightforward.

3. Use the 83(b) election with early exercise to stack QSBS and start LTCG clock simultaneously

Indiana's conformity to OBBBA §1202 means early exercise plus an 83(b) election is one of the highest-return planning strategies available to Indiana startup founders and early employees. Exercise at grant when FMV is near or equal to strike price, file the 83(b) within 30 days of exercise, and start both the LTCG holding period (1 year) and the §1202 QSBS holding period (3/4/5 years for 50/75/100% exclusion) immediately. Indiana's conformity means that federally excluded QSBS gains are also excluded from Indiana income tax — eliminating potential state and county tax on up to $15M of qualifying gain in addition to the federal exclusion. The 30-day 83(b) window is absolute; missing it forfeits this strategy entirely.

4. For NQSOs, optimize at the federal level — Indiana's state rate isn't the binding constraint

At 2.95%, Indiana's state rate on NQSO exercise income is low enough that federal bracket optimization — not state-level planning — should drive your exercise calendar. The primary federal levers: staying below the 37% bracket threshold ($626,350 single / $751,600 MFJ for 2026⁵), timing exercises after your salary has cleared the $184,500 Social Security wage base to avoid 6.2% FICA, and managing NIIT exposure (3.8% on investment income above $200K single / $250K MFJ). Indiana's flat 2.95% adds little optimization incentive beyond the federal picture — unlike California (13.3%), where state bracket management creates strong incentives to spread large NQSO exercises across multiple calendar years.

5. For post-IPO diversification, drive lot selection on federal HIFO basis — Indiana is nearly constant

Indiana's 2.95% flat rate applies uniformly to capital gains regardless of holding period or lot identity. When managing a post-IPO sell-down, use a HIFO (highest-in, first-out) or specific-identification lot selection strategy optimized for federal tax efficiency — choose lots with the highest adjusted basis to minimize federal gain recognition. Indiana's flat 2.95% (plus your county rate) is effectively a constant in this analysis: it adds the same percentage regardless of which lot you select. Unlike California, where the 13.3% state rate creates meaningful state-vs-federal lot optimization tension, Indiana's low flat rate lets you focus entirely on the federal 0%/15%/20% LTCG brackets and NIIT threshold. Work with a fee-only advisor to model multi-year sale schedules around federal brackets — the Indiana math follows automatically.

6. If you relocated out of Indiana within the last five years, calculate the sourcing ratio before exercising

At 2.95%, Indiana's nonresident sourcing claim is modest compared to California (13.3%) or New York (10.9%) — but it exists. On a $1M NQSO exercise with a 70% Indiana sourcing fraction, the nonresident Indiana tax is approximately $20,650 at the state rate. If you relocated to a zero-income-tax state (Texas, Florida, Nevada, Tennessee), there's no credit available against the Indiana nonresident bill. Compute your current sourcing ratio: as the denominator grows with post-relocation time, the Indiana-source fraction shrinks. Waiting an additional year may reduce the Indiana fraction enough to matter on large exercises, though at 2.95% the dollar impact is often minor relative to the federal and underlying stock-price considerations.

1. Indiana 2026 individual income tax rate: 2.95% flat. This is the rate for tax year 2026, reduced from 3.05% in 2025 under Indiana's multi-year rate reduction schedule. Applies to all Indiana taxable income; no preferential rate for long-term capital gains. Sources: Bloomberg Tax: Indiana Decreases Income Tax Rate for 2026; Tax Foundation: State Individual Income Tax Rates and Brackets, 2026; 2026 Indiana State Income Tax Withholding: Rates & Payroll.
2. Indiana individual income tax starts from federal adjusted gross income (IC §6-3-1-3.5). ISO exercise spreads — federal AMT preference items under IRC §56(b)(3), not in federal AGI — generate no Indiana income tax at exercise. Indiana has no state alternative minimum tax. Sources: Indiana Department of Revenue Tax Chapter (2025 filing year); IC §6-3-1-3.5 — Adjusted gross income (Indiana General Assembly).
3. Indiana SB 243 (signed March 5, 2026) updated Indiana's IRC conformity date to January 1, 2026, bringing Indiana into general conformity with OBBBA provisions enacted July 4, 2025 — including §1202 QSBS enhancements. Decoupled provisions: §168(k), §168(n), §163(j), §174, §174A. Section 1202 is not decoupled. Sources: BDO: Indiana Updates OBBBA Conformity and Tax Amnesty; KSM: 2026 Indiana Legislative Update; RSM: Indiana Keeps Federal Tax Conformity at Bay with Latest Tax Bill.
4. Indiana county income tax rates 2026. All 92 Indiana counties levy a local income tax based on residence on January 1 of the tax year. Marion County: 2.02%; Hamilton County: ~1.10% (verify at Indiana DOR); Allen County: 1.80%; Tippecanoe County: 1.10%; Johnson County: 0.85%; Bartholomew County: ~1.75%. Sources: Indiana DOR: Individual Income County Tax Rates by Year; Payroll.org: Six Indiana Counties, State Have Tax Rate Changes in 2026; Indiana DOR Departmental Notice #1 (DN-01) — County Income Tax Withholding Rates.
5. 2026 federal income tax brackets and AMT parameters. Sources: IRS Rev. Proc. 2025-32 — Tax Year 2026 Inflation Adjustments; AMT exemption $90,100 (single) / $140,200 (MFJ) with OBBBA phaseout thresholds $500,000 / $1,000,000 at 50% rate.
6. 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.
7. Indiana nonresident income tax sourcing. Indiana taxes nonresidents on Indiana-source income under IC §6-3-2-2.7; stock option compensation is sourced using a workday-ratio method. Nonresidents with Indiana-source income file Form IT-40PNR. Sources: Indiana DOR: Individual Income Tax; IC §6-3-2-2.7 — Nonresident income tax (Indiana General Assembly).

Values verified June 2026. Indiana income tax rate and IRC conformity reflect SB 243 (signed March 5, 2026). County income tax rates are set annually by individual counties and verified against Indiana DOR DN-01 and other 2026 sources; Hamilton County rate (~1.10%) should be confirmed at Indiana DOR before large exercises. QSBS conformity position is based on Indiana's updated conformity date and the absence of any specific §1202 decoupling provision in SB 243; consult an Indiana-licensed tax advisor for state tax positions on specific QSBS transactions. All information is general and does not constitute tax or legal advice.