Quantinuum Inc. (QNT) AMT + ISO Calculator
Calculator · free · no signup · QNTPlan your Quantinuum Inc. ISO exercise around the AMT bargain element from current trading price.
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Your grant
Tax inputs
Schedule A, line 7. The 2026 deduction is capped at $40,400, less above $505,000 of income.
Grant timeline
Net final value at year 3 sale — optimized plan
$226,772
After-tax dollars at end of year 3, net of all federal + state taxes through the sale.
This year: exercise 2,492 shares (of 10,000 total).
= gross gain at sale − federal + state LTCG − AMT premium above baseline regular tax (time-valued)
AMT premium for exercising: $105,649 (on top of $230,496 regular tax across the horizon)
Optimized plan keeps $55,350 more than lump-sum, $896 more than even split.
Federal AMT crossover this year: 914 shares ($41,138 bargain element). Above that, each additional share this year adds federal AMT.
Estimates only. Not financial advice.
Net final value by year
Running tally: NTV from shares exercised through year y, minus AMT premium paid through year y. The last year matches the plan's headline NTV. Hover a year for plan totals.
Optimized exercise schedule
You pay the higher of Regular tax and Tentative AMT per jurisdiction, then subtract Credit recovered. The result is Net tax. Hover any number for the bracket-by-bracket breakdown.
| 1 | 2,492 | |||
| 2 | 2,594 | |||
| 3 | 4,914 |
Federal AMT credit
Earned
$94,302
Recovered
$0
Remaining
$94,302
The AMT credit only recovers in years where regular tax exceeds AMT — typically a year with no ISO exercise. Every year in this schedule has bargain element, so AMT exceeds regular tax in every year and the credit carries forward untouched. Try a longer horizon or fewer total shares to introduce a recovery year.
Plan comparison
Net value at the end of your hold horizon.
Lump-sum
All in Year 1
$171,423
−$55,350
Even split
Equal shares each year
$225,877
−$896
Optimized
Tax-aware schedule
$226,772
Highest
Estimates only. Excludes disqualifying dispositions, NSOs, multi-state moves, and AMT preferences other than ISO bargain elements. Long-term capital gains tax assumes a qualifying disposition (ISO held ≥1 yr from exercise and ≥2 yr from grant); state LTCG follows ordinary brackets except where the state grants preferential treatment (HI, ND, SC, WI, AR, NM) or has a dedicated LTCG-only tax (WA). Assumes you are within the $100K ISO limit (any portion of an annual ISO grant whose FMV at grant exceeds $100K is treated as NSO from the start, §422(d)). State AMT figures are 2025 (next-year values published in late 2026). Not financial advice.
QSBS note. If your shares qualify (typically pre-IPO C-corp grants held 5+ years), a federal rule lets you exclude up to $10M of gain on a future sale from federal tax. That single rule shifts exercise-timing math more than AMT does. (This is §1202 “qualified small-business stock”.) Modeled in beta, not here.
You optimized one grant in isolation. The beta optimizes ISOs alongside your RSUs, NSOs, and stock in one plan.
Request beta access →Related calculators: Year-End ISO Exercise Calculator · QSBS Qualification Checker · Post-Termination ISO Exercise Calculator
About Quantinuum Inc.
Quantinuum Inc. (QNT) is a public Hardware company, incorporated in Delaware and headquartered in Broomfield, CO. IPO'd Jun 4, 2026.
Last close: $41.77 per share (as of 2026-10-09).
Nasdaq IPO Jun 2026; quantum computing hardware.
Equity grants at Quantinuum Inc. typically include incentive stock options (ISOs) and non-qualified stock options (NSOs).
Quantinuum formed on November 30, 2021, when Honeywell Quantum Solutions merged with Cambridge Quantum, combining Honeywells trapped-ion hardware with Cambridge Quantums software stack. The company builds quantum computers that trap and manipulate individual charged atoms (ions) with lasers to perform calculations; its third-generation system, Helios, launched commercially in November 2025 with 98 physical qubits and 99.921% two-qubit gate fidelity, a measure of how often paired-qubit operations run error-free. Quantinuum priced an upsized IPO at $60 per share on June 3, 2026, raising $1.68 billion, and began trading on the Nasdaq Global Market on June 4, 2026 under ticker QNT.
Sources: thequantuminsider.com · cnbc.com · honeywell.com · quantinuum.com
Equity comp at Quantinuum Inc.
- Quantinuum is a Honeywell majority-owned spinoff (approximately 49% post-IPO voting power retained by Honeywell) with an Up-C corporate structure (a dual-entity arrangement where the public company holds membership units in an operating LLC rather than owning assets directly). The 2023 Equity Incentive Plan includes a one-time liquidity award worth $25 million in equity securities that vests 25% per year over four years from the IPO effective date, conditioned on continued employment. Standard restricted share grants vest 25% per year over four years. Change-in-control acceleration is double-trigger, meaning it requires both a qualifying corporate transaction and either a qualifying termination or a continued-service condition. Section 83(b) elections (a tax form filed within 30 days of a restricted share grant, allowing the recipient to pay income tax at grant-date value rather than waiting for shares to vest) are the sole responsibility of the participant to file.
- Recent share-sale events (industry term: tender offers):
- Jan 2024: $5B implied valuation, led by JPMorgan Chase · honeywell.com
- Sep 2025: $10B implied valuation, led by Honeywell and co-investors including NVIDIA NVentures, Quanta Computer, Mitsui, and Amgen · honeywell.com
Researched 2026-05-28.
OptionsAhoy is an independent tool and is not affiliated with, endorsed by, or sponsored by Quantinuum Inc..
Use this calculator to plan a Quantinuum Inc. (QNT) ISO exercise around the AMT bargain element from the current trading price. The math accounts for federal AMT, state AMT (CA, CO, CT, MN where applicable), AMT crossover, and year-over-year credit recovery. Inputs are yours: strike price, share count, FMV at exercise, and your filing-status income.
Example: at Quantinuum Inc. (QNT)'s last close of $41.77, exercising 5,000 ISOs with a $12.53 strike creates a $146,205 bargain element. For a single filer with $200,000 of taxable income, that adds $30,729 of federal AMT in the year of exercise under 2026 rules, before any state AMT (CA, CO, CT, MN). The credit recovers in later years when your regular tax exceeds AMT. The calculator above runs your exact figures.
All Quantinuum Inc. tools → · Use the generic Multi-Year ISO Exercise Schedule Calculator for any company.
Quantinuum Inc. equity questions
- How much alternative minimum tax (AMT) will I owe exercising Quantinuum Inc. ISOs?
- Exercising incentive stock options (ISOs) does not create regular income tax, but the bargain element (the fair market value at exercise minus your strike price) counts toward the alternative minimum tax (AMT). The amount depends on the bargain element, your other income, your filing status, and your state. The calculator above models federal and state AMT, the AMT crossover point, and how the credit recovers in later years for your exact Quantinuum Inc. figures.
- Does Quantinuum Inc. grant ISOs, NSOs, or RSUs?
- Equity compensation at Quantinuum Inc. typically takes the form of incentive stock options (ISOs) and non-qualified stock options (NSOs). Incentive stock options can trigger the alternative minimum tax (AMT) when you exercise.
- When did the Quantinuum Inc. IPO lockup expire?
- Quantinuum Inc. (QNT) went public on June 4, 2026. The standard post-IPO lockup runs 180 days, so employee and insider shares generally became sellable around December 1, 2026. Confirm against your own grant paperwork, since some lockups release early or in stages.
One piece of the puzzle.
OptionsAhoy plans your Quantinuum Inc. equity alongside hedging, vesting, and de-concentration, across bullish, neutral, and bearish market scenarios. Free during beta.