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The right move depends on four facts you can verify now: your option type (ISO or NSO), the cash and tax bill required to exercise, the deadline after you leave, and whether a realistic company-approved way to sell exists. Exercising buys illiquid private shares; it does not create a market for them. You can exercise and hold, participate in a company tender offer, pursue an issuer-approved secondary sale, wait for transaction liquidity, or let the options expire after comparing those facts.
What exercising a startup option actually does
An option is a contractual right to buy a specified number of company shares at a fixed exercise price, also called the strike price. Exercising means accepting the option’s offer and paying the strike price for the underlying shares. Treasury Regulation 26 CFR 1.409A-1 uses that purchase concept for “exercise.”
After exercise, you own private-company stock rather than an option. That stock may have no public market, may be subject to transfer restrictions and a company right of first refusal, and can become worthless if the business fails. An exercise is therefore both an investment decision and a tax decision; it is not a promise that you will be able to sell.
Why the latest 409A value matters
Private companies periodically obtain a Section 409A valuation of their common stock. The latest 409A fair-market value (FMV) is a key input for tax calculations, but it is not the same as the price paid by venture investors for preferred stock. Preferred shares can have liquidation preferences and other rights that make their financing price higher than the value of employee common shares. Use the valuation applicable to your grant and exercise date, not a headline funding-round price.
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Your five possible courses of action
| Path | What you do | Main benefit | Main risk or constraint |
|---|---|---|---|
| Exercise and hold | Pay the strike price and retain private shares. | Preserves ownership and may start a long-term holding period for tax purposes. | Cash is locked up; the shares can lose all value and may be heavily diluted. |
| Company tender offer | Sell eligible shares or, in some offers, options for cash to the company or an approved buyer. | Provides a defined liquidity event without waiting for an IPO. | Eligibility, price, timing and tax treatment are offer-specific; participation can affect ISO qualification. |
| Issuer-approved secondary sale | Find a permitted buyer and transfer shares with company approval. | Can create liquidity outside a company-wide tender. | Plan restrictions, right of first refusal, consent requirements and securities-law exemptions may block the sale. |
| Transaction liquidity | Wait for an acquisition or IPO and follow the merger or offering documents. | May provide broad, organized liquidity. | There is no guaranteed date or outcome; options may be cashed out, assumed, rolled over or locked up. |
| Do nothing | Keep the option unexercised until it expires. | Avoids exercise cost and immediate tax exposure. | You can lose the option’s entire potential value if it expires or if the company never provides liquidity. |
ISO and NSO tax treatment
The Internal Revenue Service says an option can create income at grant, exercise or disposal, depending on the option and transaction. Your grant notice and equity plan should identify whether each grant is an incentive stock option (ISO) or a nonstatutory stock option (NSO).
Incentive stock options
For an ISO, there is generally no regular federal gross-income inclusion at grant or exercise. However, the spread between the stock’s FMV and your strike price can be an alternative minimum tax (AMT) adjustment in the exercise year. You may owe AMT even though you received no cash from selling the shares. The stock acquired through an ISO exercise is treated for AMT as though the special ISO treatment did not apply.
ISO tax treatment at sale depends on meeting the statutory employment and holding-period requirements. If those requirements are not met, some of the spread can be treated as ordinary income; a qualifying disposition generally receives more favorable capital-gain treatment under the applicable rules. Keep the exercise confirmation and Form 3921, which the company may provide for an ISO exercise, for your tax records.
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Nonstatutory stock options
For an NSO that lacks a readily determinable market value at grant, the IRS generally does not tax you at grant. Exercise normally creates ordinary income equal to the stock’s FMV on the exercise date minus the strike price. The company may withhold payroll taxes and other required amounts, so the cash needed can exceed the strike price alone. When you later sell the shares, the difference between your tax basis and sale proceeds is generally a capital gain or loss, subject to the holding period and other tax rules.
Why a tax projection is essential
Before exercising, model the number of shares, strike price, current 409A FMV, your other income, filing status, state of residence and the expected holding period. For an ISO, model both regular tax and AMT, including the possibility that the shares fall before you can sell them. For an NSO, model ordinary income and payroll withholding at exercise. A qualified tax professional can calculate the liability and explain estimated-payment obligations; do not treat a company’s equity portal estimate as a tax return.
What changes when you leave the startup
Vesting stops when employment ends, but vested options do not necessarily remain available indefinitely. The post-termination exercise period is controlled by the grant agreement and plan. Under the ordinary statutory ISO rule, employment termination generally leaves a three-month window to exercise while preserving ISO treatment. A plan may provide a shorter period, and exercising after the applicable ISO window can cause the option to be treated as an NSO. Death, disability and certain leave arrangements can have different rules.
Departure checklist
- Ask for the exact termination date used by the plan, not merely your last day in the office.
- Download the option agreement, plan, vesting schedule and current cap-table or equity-statement records.
- Record the vested share count, strike price, ISO/NSO designation and expiration date for every grant.
- Confirm the post-termination deadline in writing with the issuer or plan administrator.
- Obtain the latest 409A FMV and ask whether a tender offer or approved sale is open to former employees.
- Have a tax professional compare an immediate exercise with allowing the grant to expire.
How to sell private-company shares
Company tender offers
A tender offer is a defined offer by the company or an approved buyer to purchase eligible employee shares or, in some structures, options. SEC tender-offer guidance addresses disclosure, offer periods and conditions. Read the offer documents for the price, minimum or maximum amounts, eligibility date, payment timing, escrow terms, treatment of unvested awards and any repurchase rights.
Do not assume a tender sale is tax-neutral. Selling shares before the required ISO holding periods can create ordinary income, and selling an option rather than exercising it can have different consequences. Ask the company and your tax adviser how participation affects ISO status, AMT credits and your basis.
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Issuer-approved secondary sale
A private buyer can purchase your shares only if the plan, charter, shareholder agreements and applicable law permit the transfer. The company may have a right of first refusal, consent right or designated-buyer process. Federal resale provisions can require an accredited-investor purchaser, no general solicitation and specified current information about the issuer. A platform or interested buyer cannot override those restrictions.
Request the company’s transfer instructions before negotiating. Confirm whether you must first exercise, whether the company will repurchase the shares, who pays transfer fees, and whether the buyer receives the same class of stock. Keep signed transfer documents and evidence of payment.
Acquisition or IPO liquidity
In an acquisition, options may be cashed out, assumed by the buyer, rolled into replacement awards or canceled for no value. In an IPO, exercised shares may become saleable only after registration and any lock-up period. The transaction documents control; a press release or financing announcement does not. Review the merger agreement summary, exchange mechanics and lock-up terms before making an exercise decision based on a rumored transaction.
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Step-by-step exercise process
- Verify the grant. In the equity portal and signed agreement, confirm grant type, vested shares, strike price, expiration and post-termination deadline.
- Get current valuation information. Obtain the latest 409A common-stock FMV and note its effective date. Ask whether a newer valuation is pending.
- Calculate the purchase cost. Multiply vested shares by the strike price. Add wire fees, any early-exercise or repurchase terms and the tax cash reserve.
- Estimate taxes. For ISOs, calculate the AMT adjustment and possible estimated tax. For NSOs, calculate ordinary income, payroll withholding and the resulting tax basis.
- Check transfer and liquidity rules. Read the plan, charter and shareholder agreements for rights of first refusal, company consent, tender eligibility and lock-ups.
- Choose the quantity. You can often exercise all vested shares, a portion, or none. Avoid borrowing money unless you can withstand a total loss and the tax bill.
- Submit the exercise. Follow the issuer’s portal or written notice procedure, deliver funds by the required method and retain the confirmation.
- Collect tax records. Save the exercise statement, FMV used, withholding records and Form 3921 if issued. Track your basis and holding dates.
Risks that can make an apparently cheap exercise expensive
- Total loss: A startup can fail, leaving private shares with no value.
- Illiquidity: You may be unable to sell for years, even when the company is growing.
- Dilution: New financing, option grants and convertible securities can reduce your percentage ownership.
- Liquidation preferences: Preferred investors may receive proceeds before common shareholders in a sale, so a high preferred valuation does not guarantee common-stock value.
- Tax before cash: AMT on an ISO or ordinary income on an NSO can arise before any sale.
- Deadline loss: Missing an expiration or post-termination deadline can eliminate the option.
- Concentration: Exercising can tie a large share of your wealth to one employer and one illiquid asset.
Documents and questions to obtain before deciding
- Signed grant notice and the complete equity plan.
- Vesting schedule, expiration date and post-termination exercise terms.
- Latest 409A valuation and the date it became effective.
- Cap-table statement showing the security class and any known dilution.
- Transfer restrictions, right-of-first-refusal language and company-consent procedures.
- Current tender-offer, secondary-sale or transaction documents, if any.
- Prior exercise confirmations, Form 3921 for ISO exercises and payroll withholding records for NSOs.
- A written tax projection covering federal AMT or ordinary income, state tax and estimated payments.
How to make the decision
Start with a deadline, not a prediction. If an ISO will expire shortly after departure, determine the cost and AMT exposure before the deadline passes. If there is an active tender offer, compare its certain price and timing with the value of continuing to hold, after tax and transaction costs. If no approved liquidity exists, treat the shares as long-term, high-risk capital rather than money you can access on demand.
Compare the amount you could lose (exercise cost, tax and foregone alternatives) with the realistic value after dilution, liquidation preferences and the probability and timing of a liquidity event. A financing headline is not a valuation of your common shares, and an option’s paper gain is not cash until a permitted sale settles.
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