Cerebras Systems (CBRS) AMT + ISO Calculator
Calculator · free · no signup · CBRSPlan your Cerebras Systems ISO exercise around the AMT bargain element from current trading price.
Beta · invite-only · AlphaLatitude Inc. · Free Tools
Your grant
Tax inputs
Grant timeline
Net final value at year 3 sale — optimized plan
$242,783
After-tax dollars at end of year 3, net of all federal + state taxes through the sale.
This year: exercise 2,640 shares (of 10,000 total).
= gross gain at sale − federal + state LTCG − AMT premium above baseline regular tax (time-valued)
AMT premium for exercising: $90,254 (on top of $228,434 regular tax across the horizon)
Optimized plan keeps $57,102 more than lump-sum, $796 more than even split.
Federal AMT crossover this year: 1,271 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 | 2,640 | |||
| 2 | 2,567 | |||
| 3 | 4,793 |
Federal AMT credit
Earned
$80,681
Recovered
$0
Remaining
$80,681
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
$185,681
−$57,102
Even split
Equal shares each year
$241,987
−$796
Optimized
Tax-aware schedule
$242,783
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: QSBS Qualification Checker · NSO Exercise Calculator · Post-Termination ISO Exercise Calculator
About Cerebras Systems
Cerebras Systems (CBRS) is a public Semiconductors company, incorporated in Delaware and headquartered in Sunnyvale, CA. IPO'd May 14, 2026.
Last close: $203.07 per share (as of 2026-07-31).
IPO May 2026; wafer-scale AI compute.
Equity grants at Cerebras Systems typically include incentive stock options (ISOs), non-qualified stock options (NSOs), and restricted stock units (RSUs).
Cerebras Systems Inc., headquartered in Sunnyvale, California, develops semiconductors, supercomputers, and related software to power artificial intelligence deep-learning applications such as inference engines. Products include its wafer scale engine (WSE)-3 semiconductors, its CS-3 supercomputers, and its "AI inference cloud" and "AI training cloud" APIs, which allow users to access the company's computing power without buying its hardware. The company also builds data centers using its processors and supercomputers to provide cloud computing services directly to clients.
Source: Wikipedia (CC BY-SA 4.0)
Cerebras Systems makes the Wafer Scale Engine (WSE), a processor fabricated from an entire 300mm silicon wafer rather than the small dies that conventional chips use. Founded in Sunnyvale in 2016 by Andrew Feldman and four co-founders who had previously sold SeaMicro to AMD for $334 million, the company shipped its first system in August 2019. In January 2026, Cerebras signed a multi-year agreement to supply 750 megawatts of AI compute to OpenAI, a deal valued at over $10 billion. The company reported $510 million in 2025 revenue and listed on Nasdaq under the ticker CBRS in May 2026.
Sources: en.wikipedia.org · cerebras.ai · finance.yahoo.com
Equity comp at Cerebras Systems
- Original S-1 filed September 2024 was paused due to CFIUS review of UAE-based G42's investment (G42 accounted for 83% of 2023 revenue and 97% of 2024 hardware sales). CFIUS clearance reportedly obtained in early 2025 but IPO remained on hold; company raised $1.1B at an $8.1B valuation. Refiled S-1 in April 2026 with G42 removed from the investor list, targeting a May 14, 2026 NASDAQ listing under ticker CBRS. Holders face a concentrated tax-withholding event at IPO (about $230M earmarked for RSU settlement obligations) after roughly 18 months of regulatory uncertainty.
- RSUs use double-trigger vesting. Two things must both happen before the shares are yours: (1) the normal time-based vesting completes, and (2) the company has a liquidity event (an IPO or an acquisition). Until both happen, you do not yet own the shares and you do not owe tax on them.
Sources: sec.gov · techstartups.com
Researched 2026-05-11.
OptionsAhoy is an independent tool and is not affiliated with, endorsed by, or sponsored by Cerebras Systems.
Use this calculator to plan a Cerebras Systems (CBRS) 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 Cerebras Systems (CBRS)'s last close of $203.07, exercising 5,000 ISOs with a $60.92 strike creates a $710,750 bargain element. Above the 2026 federal AMT exemption ($88,100 single, $137,000 married joint), the 28% AMT rate adds roughly $199,010 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 Cerebras Systems tools → · Use the generic Multi-Year ISO Exercise Schedule Calculator for any company.
Cerebras Systems equity questions
- How much alternative minimum tax (AMT) will I owe exercising Cerebras Systems 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 Cerebras Systems figures.
- Does Cerebras Systems grant ISOs, NSOs, or RSUs?
- Equity compensation at Cerebras Systems typically takes the form of incentive stock options (ISOs), non-qualified stock options (NSOs), and restricted stock units (RSUs). Incentive stock options can trigger the alternative minimum tax (AMT) when you exercise. Restricted stock units are taxed as ordinary income when they vest.
- When did the Cerebras Systems IPO lockup expire?
- Cerebras Systems (CBRS) went public on May 14, 2026. The standard post-IPO lockup runs 180 days, so employee and insider shares generally became sellable around November 10, 2026. Confirm against your own grant paperwork, since some lockups release early or in stages.
- Do Cerebras Systems RSUs use double-trigger vesting?
- Yes. Cerebras Systems restricted stock units (RSUs) vest only when two things both happen: the time-based schedule completes, and the company has a liquidity event such as an initial public offering (IPO) or an acquisition. Until both occur you do not own the shares and owe no tax on them.
One piece of the puzzle.
OptionsAhoy plans your Cerebras Systems equity alongside hedging, vesting, and de-concentration, across bullish, neutral, and bearish market scenarios. Free during beta.