This post uses hypothetical scenarios for illustrative purposes only. It does not describe any actual client, transaction, or representation, and is not legal advice.
Take a typical situation: a Florida software company signs a term sheet at a number that makes the founder’s decade of grinding feel worth it. Then she looks past her own cap table line and sees the rest of it — forty employees holding options granted over eight years, some vested, some not, a few underwater from a high-water-mark 409A valuation two years ago, and an early batch that someone once said were “ISOs, probably.” Every one of those grants has to land somewhere at closing. Where they land is decided mostly in the merger agreement, and the tax result surprises almost everyone the first time they see it.
The merger agreement, not the option plan alone, decides what happens
Options in a private-company sale meet one of three fates. First, a cashout: each vested option is cancelled at closing in exchange for the per-share deal price minus the exercise price — the spread — times the number of shares. Second, assumption or substitution: the buyer converts the options into options over its own equity, common when the buyer is a larger company with stock worth holding and it wants the team to stay. Third, cancellation: options that are underwater, or unvested options that nobody accelerates, can be terminated — sometimes for nothing, if the plan allows it.
The plan document matters because it either authorizes those moves or it doesn’t. A well-drafted plan gives the board authority to cash out, assume, or cancel on a change in control without individual consent. An old or hand-built plan may require optionholder consent grant by grant, which converts forty employees into forty signature chases during the closing sprint. Unvested grants raise the separate question of acceleration — whether vesting speeds up on the deal itself or only on a post-closing termination — which is the single-trigger versus double-trigger negotiation, and it belongs in diligence in week one, not in the funds flow in week eleven.
A cashout is wages, not capital gain
Here is the surprise. The founder sells stock and gets capital gain, possibly long-term, possibly better. The employee whose options are cashed out gets none of that. A closing payment for a cancelled compensatory option is compensation — ordinary income, reported on a W-2 for employees, subject to income tax withholding and payroll taxes. Federal withholding typically runs at the supplemental rate of 22 percent, jumping to 37 percent on supplemental wages above $1 million, with the company withholding from the option payment itself in the funds flow. An employee expecting a capital-gains outcome on “my equity” learns at closing that the check arrives through payroll, net of withholding.
ISOs make it slightly worse. Incentive stock options carry their favorable treatment only if the holder exercises and takes stock; an ISO cancelled for cash at closing is compensation like any NSO. Exercising early enough to convert the position into actual shares — and then selling those shares in the deal — can preserve better treatment in theory, but in a private company it requires cash, an appetite for holding-period risk, and time that a signing-to-closing window rarely offers. Most deals simply cash everyone out and let the ISO label go. Large payouts to executives also feed the section 280G parachute analysis, where option acceleration counts toward the parachute math and a private company can cleanse the excess with a shareholder vote.
Section 409A polices the edges of the structure
Options granted at fair-market-value strikes are generally exempt from section 409A, and a clean cashout at closing stays exempt — the payment lands within the short-term deferral window and everyone moves on. The trouble comes from creative adjustments. Extending a departing employee’s exercise window beyond the original term, repricing without a valuation, or promising to pay option consideration on some bespoke deferred schedule can each pull a previously exempt option into 409A territory, where the penalty — immediate income, a 20 percent additional tax on the holder — is severe enough that buyers diligence it hard.
Deals with earnouts and escrows raise the sharpest version of the question: can optionholders participate in deferred consideration alongside shareholders? The regulations offer a specific accommodation for transaction-based compensation — option payments may ride on the same schedule and the same terms as the shareholders’ deal consideration, provided the arrangement pays out within the regulatory outer limit of roughly five years. Structured that way, the optionholders’ escrow and earnout pieces stay compliant; structured casually, the deferred piece can become a 409A problem that the buyer prices against the seller. Payout mechanics across escrow and earnout waterfalls are exactly the kind of thing professional paying agents publish guidance on — SRS Acquiom’s overview of option payouts in M&A is a useful orientation to how the money actually moves.
Underwater options, releases, and the funds flow
Three practical points close the loop. First, underwater options — strike at or above the deal price — are typically cancelled for no consideration, and whether that requires consent depends entirely on the plan language, so read it before the buyer does. Second, every cashout should travel with an optionholder acknowledgment: a short letter in which the holder confirms the grant details, agrees to the cancellation, and releases claims relating to the option, because a closing is the wrong moment to discover a disputed grant date or an unsigned award agreement. Third, the withholding comes out of the option consideration in the funds flow, and the spreadsheet has to show it — gross spread, withholding, employer payroll taxes, net payment — or the numbers will not tie and the wire will wait while someone rebuilds it. Buyers running a rollover structure add one more layer, deciding which managers exchange options for new equity rather than cash, which is its own negotiation over the management equity pool.
The takeaway
Optionholders are the largest group of people in most deals who have never seen a merger agreement and never will. What they experience is the ending: a payroll deposit, net of withholding, that is smaller and differently taxed than they imagined. Founders who understand the mechanics early — what the plan permits, what the cashout costs in payroll taxes, how 409A constrains the deferred pieces — can set expectations, keep the team focused through closing, and avoid pricing surprises in the buyer’s model. A disciplined M&A process treats the option pool as deal architecture, not administrative cleanup.
If you are heading toward a sale with an option pool on the cap table, feel free to reach out to my firm manager, Magda, at Magda@montague.law, or fill out our contact form. Mention you read this post.
