Csquare, Inc. (CSQR) Post-Termination ISO Calculator
Calculator · free · no signup · CSQRLeft Csquare, 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 Csquare, Inc.
Csquare, Inc. (CSQR) is a public Data company, incorporated in Delaware and headquartered in Dallas, TX. IPO'd Jul 16, 2026.
Last close: $17.97 per share (as of 2026-09-20).
NYSE IPO Jul 2026; Brookfield-backed data center colocation.
Equity grants at Csquare, Inc. typically include incentive stock options (ISOs) and non-qualified stock options (NSOs).
Csquare formed when Brookfield Infrastructure combined Evoque Data Center Solutions (bought from AT&T in 2019 for $1.1 billion) with Cyxtera Technologies (acquired January 2024 for $775 million), operating first as Centersquare before renaming to Csquare in December 2025. The Coppell, Texas company runs colocation and interconnection services, renting server rack space and network connectivity, across roughly 80 data centers in 30 markets. Under CEO Spencer Mullee, Csquare listed on the NYSE (ticker CSQR) in July 2026, pricing shares at $21 and raising about $1.05 billion to pay down debt, including a $75 million note held by Brookfield.
Sources: sec.gov · bloomberg.com · datacenterdynamics.com · theglobeandmail.com · ionanalytics.com
Equity comp at Csquare, Inc.
- Csquare filed its S-1 registration statement in June 2026 for a proposed NYSE IPO (ticker CSQR). The company adopted an Omnibus Incentive Plan under which RSUs are expected to be granted to employees and executive officers around the IPO date. Executive employment agreements include a cash severance provision equal to 1.5 times base salary plus target bonus, triggered only when both a change of control occurs AND the executive suffers a qualifying termination within 24 months following that event. Whether the same double-trigger structure applies to RSU vesting acceleration (equity that converts automatically upon a change of control regardless of whether the employee is terminated) under the Omnibus Incentive Plan could not be confirmed from publicly accessible sources. No pre-IPO tender offers were identified.
Researched 2026-07-01.
OptionsAhoy is an independent tool and is not affiliated with, endorsed by, or sponsored by Csquare, Inc..
If you have left Csquare, Inc. (CSQR) 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 Csquare, Inc. (CSQR) with 5,000 vested ISOs at a $5.39 strike, with the last close at $17.97, exercising all of them inside the 90-day window puts a $62,900 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 $17,612 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 Csquare, Inc. tools → · Use the generic Post-Termination ISO Exercise Calculator for any company.
Csquare, Inc. equity questions
- I left Csquare, 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 Csquare, 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 Csquare, Inc. grant ISOs, NSOs, or RSUs?
- Equity compensation at Csquare, 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 Csquare, Inc. IPO lockup expire?
- Csquare, Inc. (CSQR) went public on July 16, 2026. The standard post-IPO lockup runs 180 days, so employee and insider shares generally became sellable around January 12, 2027. Confirm against your own grant paperwork, since some lockups release early or in stages.
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OptionsAhoy plans your Csquare, Inc. equity alongside hedging, vesting, and de-concentration, across bullish, neutral, and bearish market scenarios. Free during beta.