Exercising a startup option means buying the underlying private-company shares at the grant’s strike price; it does not create a market or guarantee that you can sell. Before acting, compare the cash needed for exercise, the latest 409A common-stock value, tax due at exercise, your post-termination deadline, transfer restrictions, dilution and liquidation preferences, and the realistic chance and timing of a liquidity event.
In the United States, an employee generally chooses among exercising and holding, participating in an issuer-sponsored tender offer, selling shares through an issuer-approved secondary transaction, waiting for acquisition or IPO liquidity, or allowing unexercised options to expire. The right choice depends on your plan and grant documents, not on a headline venture-financing valuation.
What a private-company option actually gives you
An option is a contractual right to buy a specified number of company shares at a fixed exercise price, also called the strike price, during a stated period. You do not own the shares until you exercise. Treasury Regulation 26 CFR 1.409A-1 describes exercise as accepting the option’s offer to sell the underlying stock.
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For private-company employee plans, SEC Rule 701 is the principal compensatory-plan exemption discussed for issuing securities. SEC guidance says the offering of stock underlying an option generally begins when the option becomes exercisable and continues until exercise or termination. Rule 701 is an exemption for the company’s compensatory issuance; it is not a promise that you can resell the shares later.
Vesting is not exercise
Vesting determines how many options you have earned. Exercising converts some or all of those vested options into shares and requires payment of the strike price, plus any taxes or fees the company requires. Unvested options normally cannot be exercised, although transaction documents or plan amendments can change treatment in an acquisition.
Common stock is not the preferred stock sold to investors
Your option usually covers common stock. A financing headline may quote the price investors paid for preferred stock, which can have liquidation preferences and other rights that common stock lacks. The company’s 409A valuation is intended to estimate the fair market value of common stock for tax purposes and can be materially lower than the latest preferred financing price. Use the current 409A value and cap-table information supplied by the company, rather than assuming the preferred price is your share value.
Inventory the facts before choosing an action
Collect the following information from your grant notice, equity-plan rules, cap-table statement, 409A notice and company communications:
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- Vesting and expiration: vested shares, unvested shares, the final expiration date and any separate post-termination exercise window.
- Economics: strike price, number of vested options and the latest 409A common-stock value. Calculate the spread as 409A value minus strike price, then multiply by the number of options you might exercise.
- Tax cash: possible ISO alternative minimum tax (AMT), or NSO ordinary income and payroll withholding at exercise, plus later capital gain or loss.
- Liquidity rules: transfer restrictions, company consent, a right of first refusal, tender-offer eligibility, securities-law conditions and any IPO lock-up.
- Downside: the possibility of losing the entire investment, future dilution, liquidation preferences ahead of common stock and the inability to resell when you want.
Ask the company for the governing plan and grant agreement, the latest 409A notice, an up-to-date capitalization summary if available, and written instructions for exercise. Keep copies of every tender-offer or secondary-sale document and any tax form issued after exercise.
ISO and NSO taxes are different
The Internal Revenue Service warns that an option can create income when granted, exercised or disposed of, depending on its terms. The table below describes the federal framework for typical employee options; state taxes, employment status and plan language can change the result.
| Feature | ISO | NSO |
|---|---|---|
| Grant | Generally no regular federal gross-income inclusion when granted if statutory requirements are met. | For an option without a readily determinable market value, generally no tax at grant. |
| Exercise | Generally no regular income-tax inclusion, but the spread can be an AMT adjustment in the exercise year. Stock acquired through ISO exercise is treated for AMT as if the special treatment did not apply. | Ordinary income generally equals the fair market value of the shares received minus the strike price. Employers commonly handle payroll withholding on that income. |
| Sale | Tax is generally recognized when the stock is sold. Meeting the statutory employment and holding-period rules can preserve ISO treatment; failing them can make part of the result ordinary income. | After the exercise income event, later appreciation or decline is generally capital gain or loss when you sell. |
| After leaving | Section 422 ordinarily limits ISO treatment to exercise within three months after employment ends, subject to plan terms and statutory exceptions. | The plan and grant agreement set the post-termination exercise period; tax treatment follows the NSO rules. |
| Annual ISO limit | The first-year exercisable value is limited to $100,000 under Internal Revenue Code section 422. Amount above that limit is treated as non-ISO. | No equivalent ISO classification limit; the option remains subject to its NSO terms. |
For an ISO, the spread is not automatically regular taxable income, but it can increase AMT income. You may owe AMT in the exercise year even though you have not sold the shares and received cash. Model the tax using the exercise date, the 409A value, your other income and deductions, and any AMT credit rules that may apply in later years.
For an NSO, exercising can create a wage-tax bill immediately. If the shares are illiquid, you may have to fund withholding with cash or an approved share-withholding arrangement even though no buyer exists. Confirm the company’s method and deadline before submitting the exercise.
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Five ways to obtain value or liquidity
1. Exercise and hold
You pay the strike price and receive private common shares. This can make sense when the exercise cost and tax exposure are affordable, you can tolerate a total loss, and you believe the company has a credible path to a valuable liquidity event. You may also be trying to start the required ISO holding periods. The trade-off is that private shares can remain unmarketable for years, and a later financing can dilute you or add preferences ahead of common stock.
2. Participate in an issuer tender offer
A company or an approved buyer may offer cash for employee shares or, in some programs, for options. SEC tender-offer guidance addresses disclosure and offer conditions. Read the offer documents for the number of shares eligible, price, deadlines, escrow or payment timing, treatment of vested and unvested awards, and what happens if the offer is oversubscribed. Participation can affect ISO qualification and tax treatment, so have the documents reviewed before tendering.
3. Sell shares in an issuer-approved secondary transaction
A private buyer may purchase exercised shares only if the equity plan, charter, right of first refusal, company-consent process and a securities-law exemption permit the transfer. Federal resale provisions can require an accredited-investor purchaser, no general solicitation and specified current information about the issuer. The company may reject a buyer, match the offer under its right of first refusal or impose additional transfer conditions. Do not advertise the shares publicly or accept payment until the company and counsel confirm the permitted process.
4. Wait for transaction liquidity
In an acquisition or IPO, options may be cashed out, assumed, rolled over or become exercisable and saleable under the transaction documents. An IPO can also impose a lock-up that prevents selling for a stated period. The exact result is company-specific; read the merger agreement, equity-plan treatment notice or offering documents rather than relying on informal assurances.
5. Let the options expire
Doing nothing can be rational when the exercise price, tax exposure and loss risk exceed the realistic expected value, or when the company has no credible liquidity path. Verify the expiration date and post-termination rules first. Allowing an option to expire is irreversible.
How to exercise, step by step
- Confirm eligibility. Check that the options are vested, exercisable on the date you plan to act and not already expired. Read any blackout, trading-window or company-approval rule in the plan.
- Calculate the purchase amount. Multiply the number of options by the strike price. Add exercise fees and, for NSOs, estimated payroll withholding. For ISOs, estimate the AMT adjustment from the spread and ask a tax professional to model the year-end liability.
- Request the current valuation. Obtain the latest 409A value and its effective date. Record the difference between that value and the strike price; do not substitute a preferred financing price.
- Choose an exercise method. The company may accept a cash or electronic payment, a same-day sale if a program exists, a net exercise or an approved share-withholding method. Private companies often offer fewer methods than public companies.
- Submit the company’s form. Follow the exact portal path or paper instructions, sign the exercise notice and deliver payment before the stated deadline. Keep the confirmation and the number of shares issued.
- Check your tax records. Confirm how the company will report the transaction. An ISO exercise may generate Form 3921. An NSO exercise should appear in payroll and tax reporting. Keep the exercise confirmation, valuation notice and withholding record with your tax files.
- Record ownership restrictions. Note legends on the stock certificate or electronic record, the right of first refusal, company repurchase rights, transfer-consent requirements and any lock-up. Ownership does not equal immediate saleability.
What changes when you leave the startup
Termination can start a short exercise clock. Under the ordinary statutory rule in Internal Revenue Code section 422, an ISO generally must be exercised within three months after employment ends to retain ISO treatment, although disability, death, plan language and other statutory details can create exceptions. The plan may provide a different period for exercising the option, but exercising after the ISO window can change the tax classification.
NSO deadlines are controlled primarily by the grant and plan documents. Some plans provide a longer period; others require exercise soon after termination. Unvested options normally stop vesting when employment ends. Ask for a written post-termination statement showing the final exercise date, the vested balance and the tax consequences of exercising after departure.
How to decide whether the risk is justified
Use a decision worksheet rather than a single valuation headline. For each possible exercise amount, calculate the cash paid, estimated tax, shares received and break-even future share value after considering dilution and preferences. Then assign a realistic liquidity timeline: a company-sponsored tender offer, acquisition or IPO may never occur, and timing is uncertain.
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- You can lose the entire exercise and tax outlay without jeopardizing emergency savings or essential goals.
- The strike price is low relative to the current 409A value and you understand the AMT or wage-tax exposure.
- You have a documented reason to start or preserve ISO holding periods.
- The company has provided credible information about transfer rights and a plausible liquidity path.
Waiting or declining may be safer when
- Exercise would consume money needed for housing, debt payments, taxes or an emergency reserve.
- The 409A spread creates a large AMT bill, or an NSO creates withholding you cannot fund.
- Preferred investors have substantial liquidation preferences, future dilution is likely or the business outlook is uncertain.
- The plan prohibits transfers and there is no identified tender offer, acquisition process or IPO timetable.
Run more than one scenario: a successful sale at a gain, a long period with no liquidity and a complete loss. Private-company shares can be worth less than the exercise price after a downturn, while taxes paid at exercise may not be recoverable quickly.
Documents and professional checks that prevent expensive mistakes
- Option grant notice and the complete equity-plan document.
- Vesting schedule, expiration date and written post-termination exercise terms.
- Latest 409A valuation notice and the date it became effective.
- Cap-table or capitalization summary showing the share class and any known preference stack.
- Exercise agreement, payment instructions and confirmation of shares issued.
- Tender-offer or secondary-sale documents, including right-of-first-refusal and company-consent forms.
- Tax forms such as Form 3921 for an ISO exercise and payroll records for an NSO exercise.
A qualified tax professional can model federal AMT, ordinary income, capital gains and state taxes using your actual facts. A securities lawyer can check transfer restrictions, resale exemptions and tender-offer terms. This is a U.S.-focused framework; state and non-U.S. rules, employment status and company-plan language can change the result.
Bottom line
Exercise is a purchase, not a sale. Decide only after confirming the option type, vested balance, strike price, current 409A value, tax cash, post-termination deadline and resale restrictions. Sell only through a company-approved liquidity event or a legally permitted secondary transaction. If the numbers work only under an optimistic exit assumption, preserving cash and allowing the options to expire can be the more disciplined choice.
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