Neutron Holdings, Inc. (LIME) Post-Termination ISO Calculator
Calculator · free · no signup · LIMELeft Neutron Holdings, Inc. with vested ISOs? Most plans give you 90 days to exercise or forfeit. See your deadline, the AMT cost of exercising, and the share count that maximizes after-tax value.
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Your grant
Tax inputs
Grant timeline
Recommended exercise quantity
Exercise all 10,000
With 10%/yr expected growth over the 3-yr hold, every share's expected after-tax gain exceeds its marginal AMT cost. Net value: $171,946 at horizon.
Net after-tax value vs. shares exercised
Each point is the expected after-tax NPV at your hold horizon if you exercise that many shares now and let the rest expire.
Year-by-year tax breakdown
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 | 10,000 | |||
| 2 | 0 | |||
| 3 | 0 |
Federal AMT credit
Earned
$134,654
Recovered
$29,764
Remaining
$104,890
The AMT credit only recovers in years where regular tax exceeds AMT — typically a year with no ISO exercise. It carries forward indefinitely (Form 8801) and applies in any future tax year where regular tax exceeds AMT.
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 solved the exercise window. The beta plans what comes after it: the new shares, your remaining equity, hedges, and taxes in one multi-year plan.
Request beta access →Related calculators: Multi-Year ISO Exercise Schedule Calculator · Stock Concentration Calculator
About Neutron Holdings, Inc.
Neutron Holdings, Inc. (LIME) is a public Marketplace company, incorporated in Delaware and headquartered in San Francisco, CA. IPO'd Jul 1, 2026.
Last close: $29.45 per share (as of 2026-09-21).
Nasdaq IPO Jul 2026; Lime e-scooter/e-bike rental platform.
Equity grants at Neutron Holdings, Inc. typically include incentive stock options (ISOs) and non-qualified stock options (NSOs).
Lime's rental platform for electric scooters, e-bikes, and e-mopeds spans roughly 230 cities in 29 countries, logging 19 million riders and $886 million in revenue in 2025. The San Francisco company, founded as LimeBike in January 2017 by Brad Bao and Toby Sun, later shortened its name to Lime. On July 1, 2026, it began trading on the Nasdaq Global Select Market under ticker LIME after pricing its IPO (initial public offering, the first sale of a company's shares to public investors) at $25 per share, raising $174 million.
Sources: sec.gov · bloomberg.com · businesswire.com
Equity comp at Neutron Holdings, Inc.
- Executive RSU awards granted March 2025 carry an explicit liquidity event requirement (satisfied by IPO completion as the second trigger), in addition to time-based vesting. Until the IPO closes, RSUs do not begin to settle regardless of how much time has passed since the grant date.
- Vesting schedule: 1/12th of RSUs vest on each quarterly anniversary of the grant date over three years; some awards cliff vest after one year then vest monthly over the remaining two years.
Sources: sec.gov
Researched 2026-06-27.
OptionsAhoy is an independent tool and is not affiliated with, endorsed by, or sponsored by Neutron Holdings, Inc..
If you have left Neutron Holdings, Inc. (LIME) with vested incentive stock options (ISOs), most stock plans give you 90 days from your departure date to exercise or forfeit them. Exercising everything at once concentrates the AMT bargain element into a single tax year. This calculator computes your window deadline from your departure date, the alternative minimum tax (AMT) cost of a full exercise at the current trading price, and the partial-exercise share count that maximizes expected after-tax value.
Example: leaving Neutron Holdings, Inc. (LIME) with 5,000 vested ISOs at a $8.83 strike, with the last close at $29.45, exercising all of them inside the 90-day window puts a $103,075 bargain element into one tax year. Above the 2026 federal AMT exemption ($88,100 single, $137,000 married joint), the 28% AMT rate adds roughly $28,861 on top of regular tax before any state AMT (CA, CO, CT, MN). Exercising fewer shares lowers that bill at the cost of forfeiting the rest; the calculator above finds the count that maximizes expected after-tax value for your exact figures.
All Neutron Holdings, Inc. tools → · Use the generic Post-Termination ISO Exercise Calculator for any company.
Neutron Holdings, Inc. equity questions
- I left Neutron Holdings, Inc.. How long do I have to exercise my ISOs?
- Most stock plans give you 90 days from your departure date to exercise vested incentive stock options (ISOs); unexercised options are forfeited when the window closes. Tax law is slightly wider: ISO treatment requires you to have been an employee within 3 months of exercise (Internal Revenue Code Section 422(a)(2)), so options exercised under an employer-extended window are taxed as non-qualified stock options (NSOs). Check your grant agreement for Neutron Holdings, Inc.'s exact terms. The calculator above computes your deadline from your departure date, the alternative minimum tax (AMT) cost of exercising, and the share count that maximizes after-tax value.
- Does Neutron Holdings, Inc. grant ISOs, NSOs, or RSUs?
- Equity compensation at Neutron Holdings, 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 Neutron Holdings, Inc. IPO lockup expire?
- Neutron Holdings, Inc. (LIME) went public on July 1, 2026. The standard post-IPO lockup runs 180 days, so employee and insider shares generally became sellable around December 28, 2026. Confirm against your own grant paperwork, since some lockups release early or in stages.
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