Cash, Cashless, or Net Exercise: Choosing How to Exercise Your Options

The decision to exercise is only half the question. How you pay for the shares affects your taxes, your concentration, and how much cash leaves your account.

When employees at Bay Area companies decide to exercise stock options, the conversation usually centers on whether the timing is right. Just as important is the mechanics: where the money to pay the strike price and the associated taxes comes from. There are three broad methods, and the one available to you depends heavily on whether your company is public or private, what the plan permits, and whether your options are incentive stock options (ISOs) or nonstatutory stock options (NSOs).

Cash exercise

A cash exercise means you pay the strike price, and any required withholding, from your own funds and keep every share. As Carta's guide to exercising puts it, this is the method with the most risk, because you are committing capital and the shares may be worth less later. It is also the only method that preserves ISO treatment in full, since no shares are sold at exercise. Under the ISO statute, holding the shares two years from grant and one year from exercise allows the whole gain to be taxed as long-term capital gain.

At a private company, cash exercise is often the only choice. The cost can be substantial. Consider a hypothetical employee with 20,000 ISOs at a $2 strike and a current 409A value of $12. The strike costs $40,000, and the $200,000 spread is an AMT preference item calculated on Form 6251, which could produce a five-figure AMT bill on shares that cannot be sold. That combination of cash out the door and illiquid stock is why many people exercise in tranches over several years rather than all at once.

Cashless exercise and sell-to-cover

In a cashless exercise, the broker sells some or all of the shares immediately and uses the proceeds to cover the strike price, fees, and taxes. Selling everything is sometimes called a same-day sale; selling only enough to cover costs is sell-to-cover. According to Carta's cashless exercise overview, these methods are generally available only at public companies or at private companies conducting a tender offer, because there must be a buyer for the shares.

The tax result is straightforward for NSOs: the spread is ordinary income at exercise regardless of method, reported as wages per IRS Topic 427, and federal supplemental withholding of 22% (37% above $1 million) applies under IRS Publication 15. For ISOs, any shares sold at exercise become a disqualifying disposition, so the spread on those shares is ordinary income. Shares you keep in a sell-to-cover ISO exercise can still qualify if held long enough, but the AMT calculation becomes more complex.

Cashless exercise requires no outside capital and immediately reduces exposure to your employer's stock, which many Silicon Valley households already carry through salary, RSUs, and unvested grants. The costs are ordinary income treatment, and, for public company insiders, possible restrictions under trading windows or a Rule 10b5-1 plan.

Net exercise

A net exercise, sometimes called a net settlement, is a variation in which the company itself withholds shares equal in value to the strike price, and sometimes the taxes, and delivers the remainder. No cash changes hands and no market sale occurs. As ESO Fund's explanation of net exercise notes, the method must be explicitly permitted by the plan, most private companies do not offer it, and the withheld shares are valued at the 409A price, which is often lower than what a buyer might pay. For ISOs, the withheld portion is treated as a disqualifying disposition and taxed as ordinary income on the spread.

Choosing among them

The considerations that tend to drive the choice include how much cash you can commit without impairing other goals, whether the company's shares are liquid, how concentrated you already are, and the tax profile of the options. A cash exercise maximizes potential upside and ISO benefits at the cost of capital and risk. A cashless exercise is the low-friction way to convert options to cash or diversify at the cost of ordinary income treatment. A net exercise sits in between but depends entirely on plan terms.

Whatever method you use, the plan document, the brokerage's exercise form, and your tax preparer should all agree on the number of shares, the basis, and the income reported. This article is educational only and is not investment, tax, or legal advice; please consult a qualified professional before exercising.

Important Disclosures

Important Disclosures: Propulsion Capital Management is an investment adviser registered with the State of California Department of Financial Protection and Innovation. Registration does not imply a certain level of skill or training. This article is provided for general informational and educational purposes only and does not constitute investment, tax, legal, or accounting advice, nor an offer or solicitation to buy or sell any security or to adopt any particular investment strategy. The information is believed to be accurate as of the date of publication but is subject to change without notice; tax laws and regulations change frequently and their application depends on individual facts and circumstances. Nothing herein should be relied upon as a substitute for personalized advice from a qualified professional. Investing involves risk, including the possible loss of principal, and past performance is no guarantee of future results. Diversification does not ensure a profit or protect against loss. Any examples are hypothetical, are for illustrative purposes only, and do not reflect the experience of any client. Links to third-party websites are provided for convenience; Propulsion Capital Management does not endorse, and is not responsible for, the content of third-party sites. Propulsion Capital Management does not provide tax or legal advice; please consult your tax adviser or attorney regarding your specific situation.