Leaving Cursor? Plan your 90-day ISO window
Calculator · free · no signup · pre-IPOCursor is pre-IPO. Left with vested ISOs? Model the 90-day exercise-or-forfeit decision and its AMT cost at any valuation: current 409A or an expected exit price.
Beta · invite-only · AlphaLatitude Inc. · Free Tools
Your grant
Seeded from secondary-market data, as of Jun 11, 2026
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: $3,935,155 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
$3,339,394
Recovered
$29,764
Remaining
$3,309,630
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 →About Cursor
Cursor is a privately held Dev Tools company, incorporated in Delaware and headquartered in San Francisco, CA.
Last reported secondary-market price: $1,194.55 per share (as of 2026-06-11). Your own 409A may differ.
$1.2B ARR; AI code editor.
Equity grants at Cursor typically include incentive stock options (ISOs) and non-qualified stock options (NSOs).
Anysphere, Inc., doing business as Cursor, is an American software company which develops Cursor, an AI coding agent and software development environment. Founded in 2022, the San Francisco-based company builds tools and models that allow users to edit code, search codebases, run commands, and complete programming tasks using natural-language instructions. Cursor achieved a US$29.3 billion valuation and surpassed $3 billion in annual recurring revenue by early 2026.
Source: Wikipedia (CC BY-SA 4.0)
Four MIT friends, Michael Truell, Sualeh Asif, Arvid Lunnemark, and Aman Sanger, founded Anysphere in 2022 and shipped Cursor, an AI-native code editor, in March 2023. Cursor embeds large language models directly into the editing experience, letting developers write, explain, and refactor code through natural language alongside their existing workflow. The company reached $1 billion in annualized revenue by November 2025, the fastest B2B software company to hit that milestone, and closed a $2.3 billion Series D that month at a $29.3 billion valuation.
Sources: en.wikipedia.org · cnbc.com
Equity comp at Cursor
- Likely uses ISOs and NSOs rather than RSUs at the current stage (founded 2022, on the order of 50 to 300 employees as of late 2025, no public IPO plan). Rapid valuation escalation (Series B around $400M August 2024, Series C $9.9B June 2025, Series D $29.3B November 2025) creates significant 409A overhang and AMT exposure for option holders, since each step-up resets the strike price for new grants.
Sources: en.wikipedia.org · techcrunch.com
Researched 2026-05-11.
OptionsAhoy is an independent tool and is not affiliated with, endorsed by, or sponsored by Cursor.
If you are leaving Cursor with vested incentive stock options (ISOs), most stock plans give you 90 days from departure to exercise or forfeit them. The calculator works at any valuation: enter your strike and the current 409A fair market value (FMV) or an expected exit price. It computes your window deadline, the alternative minimum tax (AMT) cost of exercising in full, and the partial-exercise share count that maximizes expected after-tax value.
Example: leaving Cursor with 5,000 vested ISOs at a $358.37 strike, with the last reported price at $1,194.55, exercising all of them inside the 90-day window puts a $4,180,900 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 $1,170,652 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 Cursor tools → · Use the generic Post-Termination ISO Exercise Calculator for any company.
Cursor equity questions
- I left Cursor. 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 Cursor'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 Cursor grant ISOs, NSOs, or RSUs?
- Equity compensation at Cursor 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 Cursor 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 Cursor 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 Cursor equity alongside hedging, vesting, and de-concentration, across bullish, neutral, and bearish market scenarios. Free during beta.