An employee bonus on the sale of a company usually comes in one of four forms: a transaction bonus paid because the deal closed, a retention bonus for staying through the transition, enhanced severance if the new owner cuts your role, and the cash-out or rollover of any stock options, RSUs, or restricted stock you hold. Each has its own conditions, and each is generally taxed as ordinary income with supplemental-wage withholding, though some equity can reach capital gains rates if you meet specific holding periods. The specifics live in your equity plan, grant agreements, and employment contract, so the size of the check and the tax treatment depend on language you may have signed years ago.
Transaction Bonuses
A transaction bonus is a cash payment the selling company’s board authorizes because the acquisition closed. It rewards employees who helped prepare the company for sale, assisted with buyer due diligence, or played a role the board wants to compensate. The amount is usually a percentage of base salary or a flat dollar figure. The only condition is that the deal actually closes. If it falls apart, no one gets paid.
These are most common for senior leaders and employees whose cooperation was critical to closing, though smaller companies sometimes extend them more broadly. Eligibility and amounts are spelled out in a written bonus plan approved by the board before closing. If you haven’t seen such a plan or been told you’re a participant, you probably aren’t one.
Retention and Stay Bonuses
Retention bonuses solve a different problem: keeping key people from leaving during the messy post-acquisition transition. The buyer identifies employees whose departure would damage the business and offers them cash to stay for a defined period after closing, often 12 to 24 months.
Payment is conditional on actually staying. Leave before the required period ends and you forfeit part or all of the bonus. Many retention agreements use a staggered schedule where a portion pays out at closing and the rest pays out at the end of the required service period. That gives you some money upfront while keeping the larger incentive tied to continued employment.
If you’re offered a retention agreement, read the forfeiture provisions carefully. Some require full repayment of the upfront portion if you leave early. Others prorate it. The difference can run to tens of thousands of dollars.
Change-in-Control Severance
Change-in-control severance is a contractual safety net that pays out if the acquisition costs you your job. The standard structure requires two things before you see any money: the sale closes, and then you’re either terminated without cause or you resign because the new owner fundamentally changed your role. Being unhappy with new management isn’t enough on its own. Your contract has to define what qualifies as “good reason” for resignation, and common triggers include a significant pay cut, a major demotion, or a required relocation.
These protections are most common in executive employment agreements, where the change-in-control severance package is significantly richer than standard severance. A typical arrangement might provide 12 to 18 months of base salary plus a prorated annual bonus and continued health benefits for a defined period. The enhanced package exists because executives face real career risk in acquisitions: the buyer often has its own leadership team, and redundant roles get eliminated quickly.
One detail people miss: the protection window is limited. Most change-in-control clauses only apply to terminations occurring within 12 or 24 months after closing. Get laid off in month 25 and you fall back to whatever standard severance policy exists.
How Your Equity Gets Resolved
For many employees, equity is where the real money is. Stock options, restricted stock units, restricted stock, phantom stock, and stock appreciation rights all need to be resolved, and the method depends on the merger agreement and the equity plan. There are generally three outcomes: the buyer cashes out your equity, the buyer converts it into equivalent grants of the acquiring company’s stock, or some combination of both.
In a cash-out, each vested stock option pays the sale price per share minus your exercise price. Options with a $5 exercise price in a $20 per-share deal pay $15 each; options where the exercise price exceeds the sale price are underwater and get canceled with no payment.1Internal Revenue Service. Topic No. 427, Stock Options RSUs and restricted stock convert to cash at the per-share acquisition price. Phantom stock and stock appreciation rights, which are cash-based instruments that track share value, typically settle in cash at the closing price.2Internal Revenue Service. Publication 525 – Taxable and Nontaxable Income
Instead of cashing out, the buyer can assume the existing equity plan and convert your unvested awards into equivalent grants of buyer stock. The conversion ratio is set in the merger agreement, and the economic value of the new grant must be at least equal to the old one. Your original vesting schedule typically carries over. This approach is more common in stock-for-stock mergers than in all-cash deals.
Single-Trigger vs. Double-Trigger Acceleration
Most equity plans include a change-in-control provision that determines what happens to unvested awards. Single-trigger acceleration vests all your unvested equity automatically when the acquisition closes. No other condition is required.
Double-trigger acceleration requires two events: the sale closes, and then you’re terminated without cause or resign for good reason within a set period. If you keep your job under the new owner, your equity continues to vest on its original schedule or converts to buyer stock. Buyers strongly prefer double-trigger provisions, because employees whose equity has already fully vested have less financial incentive to stay. Double-trigger has become the standard in venture-backed and private equity-backed companies. If your grant agreement doesn’t specify, the equity plan document itself usually controls.
Withholding on Cash Bonuses and Severance
Every cash bonus, retention payment, and severance payment from a company sale is taxed as ordinary income.2Internal Revenue Service. Publication 525 – Taxable and Nontaxable Income What catches people off guard is how much gets withheld before the money hits the account.
The IRS treats these payments as supplemental wages. The employer can withhold federal income tax at a flat 22% rate, or at 37% for any portion of supplemental wages above $1 million in a calendar year.3Internal Revenue Service. Publication 15 – Employers Tax Guide On top of that, you owe the employee share of FICA: 6.2% for Social Security on earnings up to $184,500 in 2026, plus 1.45% for Medicare on all earnings.4Social Security Administration. Contribution and Benefit Base If your total Medicare wages for the year exceed $200,000 (or $250,000 if married filing jointly), an additional 0.9% Medicare tax applies to wages above that threshold.5Internal Revenue Service. Topic No. 560, Additional Medicare Tax
A large bonus can push you past the Social Security wage base early in the year, which means no further Social Security tax is withheld from your regular paychecks for the rest of the year. That’s a timing benefit, not a tax savings. The bigger issue is that the flat 22% or 37% withholding rate may not match your actual tax liability. If your effective rate is higher, you’ll owe at tax time. If it’s lower, you’ll get a refund. Either way, the net check from a $100,000 bonus is far less than $100,000, and planning for that gap matters.
Tax Treatment of Equity Payouts
Equity taxation is more complicated than cash bonuses because it depends on the type of equity, how long you’ve held it, and whether you made any special elections along the way.
Nonqualified Stock Options
When NSOs are cashed out at closing, the spread between the sale price and your exercise price is taxed as ordinary income. This amount is subject to FICA withholding and reported on your W-2, just like salary.1Internal Revenue Service. Topic No. 427, Stock Options If you previously exercised NSOs and held the shares, any further appreciation above the exercise-date price could qualify as a capital gain, with the holding period determining whether it’s short-term or long-term.6Internal Revenue Service. Topic No. 409, Capital Gains and Losses
Incentive Stock Options
ISOs get more favorable tax treatment than NSOs, but only if you meet strict holding periods: at least two years from the grant date and at least one year from the exercise date.7Office of the Law Revision Counsel. 26 USC 422 – Incentive Stock Options Meet both, and the entire gain qualifies for long-term capital gains rates.
The problem in a company sale is that a cash-out merger can force a disposition before you’ve satisfied those holding periods. When that happens, it’s a disqualifying disposition, which converts the gain into ordinary income reported on your W-2.8Office of the Law Revision Counsel. 26 USC 421 – General Rules One exception: if the acquisition is structured as a stock-for-stock reorganization, the exchange of your ISO shares for acquirer shares generally doesn’t count as a disposition, and the acquirer’s shares inherit the original holding period. In a straight cash acquisition, employees holding recently exercised ISOs lose the favorable treatment.
ISOs also carry an alternative minimum tax risk. The spread at exercise is a preference item for AMT. If the sale happens in the same tax year as exercise, the regular tax on the disqualifying disposition usually eliminates the AMT issue. If you exercised in one year and the sale closes the next, you may face AMT liability from the exercise year on top of ordinary income in the sale year. This is where most people need a tax advisor.
RSUs and Restricted Stock
RSUs that vest and cash out at closing are taxed entirely as ordinary income based on the fair market value at vesting.9Office of the Law Revision Counsel. 26 USC 83 – Property Transferred in Connection With Performance of Services There’s no capital gains component because you never held the underlying shares.
Restricted stock works differently if you filed a Section 83(b) election within 30 days of the grant. That election means you already paid ordinary income tax on the stock’s value at grant. Any appreciation between the grant date and the sale is then taxed as a capital gain, with the rate depending on holding period.6Internal Revenue Service. Topic No. 409, Capital Gains and Losses Without the 83(b) election, the full value at vesting is ordinary income, just like RSUs.
The Golden Parachute Tax Trap
If you’re a senior executive or significant shareholder, a special set of rules can impose a brutal penalty on large change-in-control payments. Under IRC Section 280G, the IRS adds up all payments you receive because of the acquisition, including accelerated equity, bonuses, severance, and non-compete payments. If that total equals or exceeds three times your base amount (roughly your average annual W-2 compensation over the five tax years preceding the sale), the excess over one times that base amount becomes an “excess parachute payment.”10eCFR. 26 CFR 1.280G-1 – Golden Parachute Payments
The consequences hit both sides. You pay a 20% excise tax on the excess parachute payment, on top of regular income tax.11Office of the Law Revision Counsel. 26 USC 4999 – Golden Parachute Payments The company loses its tax deduction for that same amount.12Internal Revenue Service. Golden Parachute Payments Guide – Audit Technique Guide Combined with federal and state income tax, the effective tax rate on the excess portion can approach 60% or more.
A common contract feature is a “cutback” provision, which reduces your total payments to just below the three-times threshold so the excise tax never triggers. Other contracts include a “gross-up” clause where the company pays an additional amount to cover the excise tax. Gross-ups have become less common because they’re expensive and draw shareholder criticism. If your employment agreement addresses 280G, understanding whether it includes a cutback or a gross-up is one of the highest-value things you can do before a deal closes.
Escrow Holdbacks: Why You Might Not Get Paid Immediately
You may not receive the full cash-out amount at closing. In most acquisitions, the buyer holds back a portion of the purchase price in escrow, typically 10% to 25%, to cover potential claims that arise after the deal closes. If the buyer discovers undisclosed liabilities or the seller breached representations in the merger agreement, the buyer can claw back money from that escrow fund.
Escrow periods often run 12 to 18 months, sometimes longer. During that time, your share of the holdback sits in an escrow account. If no claims are made, you eventually receive the withheld amount. If the buyer makes a successful indemnification claim, the escrow fund shrinks and everyone’s payout takes a proportional hit. The per-share price you use to estimate your equity cash-out may be higher than what you ultimately receive.
Documents to Review Before Closing
Most employees don’t realize how much of their payout depends on specific contract language they may have signed years ago and never read again. Before the deal closes, pull out and review the following documents.
- The equity plan document, which defines “change in control,” sets the acceleration rules (single or double trigger), and specifies whether the board can amend the plan before closing.
- Each individual grant agreement, specifying the number of shares, vesting schedule, and exercise price. Some grants may have different acceleration terms than others.
- Your employment agreement, for change-in-control severance provisions, non-compete clauses, and any deferred compensation arrangements.
- Any retention or bonus plan, outlining the payment schedule, forfeiture conditions, and whether the bonus survives if the buyer terminates you during the retention period.
- The merger agreement itself. You may not have access to the full document before it’s publicly filed, but the sections covering treatment of outstanding equity awards dictate whether your grants are cashed out, assumed, or rolled over. This agreement overrides your individual grant agreements where they conflict.
The merger agreement is the final word on equity treatment. If it says options are cashed out at $20 per share, that’s the price regardless of what anyone told you informally. Read the documents, run the math on your specific grants, and if the numbers are large enough to matter, get a tax advisor involved before closing rather than after. The tax planning opportunities disappear once the deal is done.