Plan your Quantinuum Inc. ISO exercise
Calculator · free · no signup · pre-IPOQuantinuum Inc. is pre-IPO. Plan your AMT impact at any valuation: current 409A, expected IPO price, or post-IPO scenarios.
Beta · invite-only · AlphaLatitude Inc. · Free Tools
Your grant
Seeded from secondary-market data, as of Jun 29, 2026
Tax inputs
Grant timeline
Net final value at year 3 sale — optimized plan
$308,174
After-tax dollars at end of year 3, net of all federal + state taxes through the sale.
This year: exercise 2,879 shares (of 10,000 total).
= gross gain at sale − federal + state LTCG − AMT premium above baseline regular tax (time-valued)
AMT premium for exercising: $174,142 (on top of $228,434 regular tax across the horizon)
Optimized plan keeps $54,805 more than lump-sum, $368 more than even split.
Federal AMT crossover this year: 849 shares ($57,238 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 | 2,879 | |||
| 2 | 3,609 | |||
| 3 | 3,512 |
Federal AMT credit
Earned
$144,596
Recovered
$0
Remaining
$144,596
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
$253,369
−$54,805
Even split
Equal shares each year
$307,806
−$368
Optimized
Tax-aware schedule
$308,174
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 →About Quantinuum Inc.
Quantinuum Inc. is a privately held Hardware company, incorporated in Delaware and headquartered in Broomfield, CO. S-1 filed May 26, 2026.
Last reported secondary-market price: $72.41 per share (as of 2026-06-29). Your own 409A may differ.
Equity grants at Quantinuum Inc. typically include incentive stock options (ISOs) and non-qualified stock options (NSOs).
Quantinuum emerged in November 2021 from the merger of Honeywell Quantum Solutions and Cambridge Quantum, combining Honeywell's trapped-ion hardware with Cambridge Quantum's software stack. Headquartered in Broomfield, Colorado, the company builds and sells full-stack quantum computers: its H2 system runs 56 ytterbium qubits with all-to-all connectivity, and its Helios system scales to 98 barium-ion qubits with industry-leading gate fidelity. Software products include Quantum Origin (quantum-enhanced cryptography) and InQuanto (quantum chemistry simulation). Quantinuum reported $30.9 million in 2025 revenue and went public on Nasdaq (QNT) on June 4, 2026, raising $1.68 billion at $60 per share.
Sources:
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..
The calculator works at any Quantinuum Inc. valuation: enter your strike, the current 409A FMV, an expected IPO price, or anywhere in between. AMT is triggered on the bargain element (FMV minus strike) when you exercise; the calculator models federal AMT, state AMT, and the multi-year credit-recovery path.
Example: at Quantinuum Inc.'s last reported price of $72.41, exercising 5,000 ISOs with a $21.72 strike creates a $253,450 bargain element. Above the 2026 federal AMT exemption ($88,100 single, $137,000 married joint), the 28% AMT rate adds roughly $70,966 on top of regular tax 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.
- Are Quantinuum Inc. shares eligible for QSBS?
- They might be. Qualified small business stock (QSBS) under Internal Revenue Code Section 1202 can exclude federal tax on much of the gain when shares were acquired at original issuance from a C-corporation while its gross assets were under $50 million, and held at least five years. Whether your Quantinuum Inc. shares qualify turns on when you acquired them and the company's asset size at that time.
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.