When a company you own stock in gets bought out, your shares are converted on the closing date into whatever the merger agreement says shareholders receive: cash, stock in the acquiring company, or a combination of the two. You don’t have to sell, and in most cases you don’t have to do anything at all. The conversion happens by operation of law once the deal closes, and the proceeds land in your brokerage account. What you receive, and what you owe in taxes on it, depends entirely on how the deal was structured. Most publicly announced acquisitions take three to nine months to close, and your shares keep trading in the meantime, usually at a small discount to the announced price.
What You Actually Receive
The merger agreement spells out the payment shareholders get for each share. Lawyers call this the consideration, and it comes in a few standard forms.
Cash
The simplest structure. Every share converts into a fixed dollar amount. If the agreement says $50 per share, you get $50 per share regardless of what the acquirer’s own stock does between announcement and closing. Cash deals give you immediate liquidity and trigger a fully taxable event in the year you receive the money.
Stock in the Acquiring Company
Instead of cash, you receive shares of the acquirer at an exchange ratio set in the merger agreement. For example, 0.8 acquirer shares for each share you own. Stock-for-stock deals often let you defer capital gains taxes entirely until you eventually sell the new shares.
A Mix of Cash and Stock
Many deals split the consideration. You might receive $20 in cash plus 0.4 shares of the acquirer for each share. The cash portion is taxable immediately; the stock portion may qualify for deferral. Mixed deals often let shareholders elect whether they prefer cash or stock, but the acquirer usually caps the total amount of each. If too many shareholders elect cash, proration kicks in, your cash allocation gets scaled back, and you receive more stock to make up the difference. The reverse happens if everyone wants stock.
Contingent Value Rights
Some deals, especially in pharmaceuticals, include contingent value rights. These are essentially IOUs that pay out if a specific milestone is met, such as a drug clearing a clinical trial or a revenue target being hit. If the milestone never happens, the CVR expires worthless. If it does, you receive an additional cash payment, taxable when received.
How and When the Conversion Happens
Acquisitions close through one of two mechanisms, and the difference affects the timeline more than the outcome.
Tender Offer
The acquirer goes directly to shareholders and asks them to sell their shares at the offered price. Federal rules require the offer to stay open for at least 20 business days.1GovInfo. 17 CFR 240.14e-1 – Unlawful Tender Offer Practices Once enough shareholders tender to meet the minimum threshold, often 50% or more of outstanding shares, the deal closes. Shareholders who refuse to tender are typically squeezed out through a follow-up short-form merger at the same price, so holding out rarely changes anything.
Statutory Merger
A statutory merger requires a formal shareholder vote. The company mails proxy materials, and shareholders vote at a special meeting or submit ballots by mail or online. Most corporate charters require approval by a majority of outstanding shares, not just a majority of those who vote, which means abstaining effectively counts against the deal. Once the vote passes and regulators sign off, the merger becomes effective on the closing date and your old shares are automatically converted into the right to receive the merger consideration.
How the Payment Reaches You
A third-party exchange agent, usually a bank or trust company, handles the mechanical work of swapping your old shares for the new consideration. If your shares sit in a brokerage account, the process is essentially invisible. Your broker coordinates with the exchange agent, and one day you log in to find cash or new shares where the old position used to be.
Physical stock certificates work differently. The exchange agent mails you a Letter of Transmittal with instructions to send in your certificates. You sign and return the letter along with the certificates, and the payment follows. For shares with significant value, the exchange agent will require a Medallion Signature Guarantee on your documents before processing.2Investor.gov. Medallion Signature Guarantees: Preventing the Unauthorized Transfer of Securities Most banks provide this service free to account holders. Until you return the paperwork, your payment sits with the exchange agent.
One quiet cost catches people off guard: many brokerages charge a mandatory reorganization fee when processing a merger or acquisition. These typically run $20 to $40 per event and are deducted automatically from your proceeds. Some firms waive the fee for larger accounts.
If the stock-for-stock ratio leaves you with a fractional share (say, 47.3 shares of the acquirer), the exchange agent sells all shareholders’ fractional entitlements on the open market and sends you cash for your piece. That small cash amount is taxable.
What You’ll Owe in Taxes
This is the part most investors underestimate. The tax hit varies dramatically based on what you receive, how long you held the shares, and your income level.
Cash Buyouts Are Taxable Right Away
When you receive cash for your shares, the IRS treats it like any other stock sale. You report the gain or loss on Form 8949 and Schedule D.3Internal Revenue Service. Instructions for Form 8949 Your taxable gain equals the cash received minus your cost basis (what you originally paid, including commissions).
Shares held for one year or less generate short-term capital gains, taxed at your ordinary income rate, which for 2026 can reach 37% for high earners.4Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026 Shares held longer than one year qualify for long-term capital gains rates of 0%, 15%, or 20%, depending on income.5Internal Revenue Service. Topic No. 409, Capital Gains and Losses
The one-year line matters more than people realize. If you bought shares 11 months before a merger closes, the difference between short-term and long-term treatment can be tens of thousands of dollars on a large position. You can’t control the closing date, but it pays to know where you stand.
Stock-for-Stock Can Be Tax-Free
When you receive only stock in the acquiring company, the transaction often qualifies as a tax-free reorganization under the Internal Revenue Code.6Office of the Law Revision Counsel. 26 USC 368 – Definitions Relating to Corporate Reorganizations You owe nothing at closing. Your cost basis from the old shares carries over to the new shares.7Office of the Law Revision Counsel. 26 US Code 358 – Basis to Distributees You’ll pay capital gains tax later, when you sell the acquirer’s shares, using your original purchase date and cost basis. Any cash you receive for a fractional share is taxable in the year of the merger.
Mixed Deals and the Boot Rule
In a mixed deal that otherwise qualifies as a reorganization, the cash portion is called “boot.” The cash is taxable, but only up to the amount of your total gain on the transaction. If you paid $30 per share and the merger gives you $15 in cash plus acquirer shares worth $25, your total gain is $10 per share. Even though you received $15 in cash, you recognize only $10 of gain because that’s the ceiling. If your cost basis is high relative to the merger price, you may owe less than you’d expect on the cash portion.
The 3.8% Surtax for High Earners
Households with modified adjusted gross income above $200,000 for single filers or $250,000 for joint filers owe an additional 3.8% Net Investment Income Tax on capital gains, including merger proceeds.8Internal Revenue Service. Topic No. 559, Net Investment Income Tax A sizable buyout payment can push you over these thresholds in the year of closing even if you’re normally under them, so the effective top rate on long-term gains can reach 23.8%.
Check Your 1099-B
Your broker will issue a Form 1099-B reporting the proceeds.9Internal Revenue Service. Instructions for Form 1099-B (2026) One recurring problem: the cost basis reported on the 1099-B may be wrong, especially for shares purchased years ago, transferred between brokers, or acquired through dividend reinvestment plans. The IRS matches your return against the 1099-B, so if your broker reports a basis lower than your actual basis, you’ll appear to owe more tax than you do. Verify the basis against your own records and report the correct figure on Form 8949. For mixed deals, allocating basis between the taxable and non-taxable portions gets complicated, and a tax professional often earns their fee here.
If You Hold Employee Stock Options or RSUs
Employee equity in the target company gets treated differently from stock sitting in your brokerage account. The specifics depend on your grant agreement and the terms negotiated between the two companies.
Vested stock options are typically either cashed out at the spread between the merger price and your exercise price, or converted into equivalent options in the acquirer. Vested RSUs are usually paid out at the merger consideration price, the same as regular shares. Either way, proceeds from vested employee equity are taxed as ordinary income, not capital gains, because the compensation element hasn’t been previously taxed.
Unvested equity is where it gets complicated. The merger agreement may accelerate all unvested grants at closing, convert them into unvested grants in the acquirer that continue on the original schedule, or cancel them entirely. Many executive grants include “double-trigger” acceleration, which requires both the acquisition and a subsequent involuntary termination before unvested equity vests. Single-trigger provisions accelerate vesting on the change of control alone. Your grant agreement and equity plan control which rule applies.
If you hold incentive stock options, a modification through acceleration or conversion can disqualify them from ISO tax treatment, converting them into non-qualified options taxed at ordinary income rates. Your company’s equity compensation team can walk through the specifics for your grants.
If Your Shares Are in a Retirement Account
Stock held inside an IRA, 401(k), or other tax-advantaged account still gets converted the same way: cash replaces the shares, or new acquirer shares appear in the account. The difference is that no taxable event occurs at the merger. The proceeds stay inside the account and follow the account’s normal tax rules. You’ll pay ordinary income tax on eventual distributions from a traditional IRA or 401(k); qualified Roth distributions are tax-free.
One thing to watch in a stock-for-stock merger inside a 401(k): the acquirer’s stock may not be an available investment option in your plan. If it isn’t, the plan will need to liquidate it and reinvest the proceeds in one of the plan’s approved funds. Your plan administrator can explain the timeline.
If You Think the Price Is Too Low
You have some rights during the process, though in practice they matter most to large or institutional holders.
Voting
In a statutory merger, you’ll receive proxy materials and a ballot. Approval usually requires a majority of all outstanding shares, so a non-vote effectively counts as a “no.” Institutional shareholders drive most outcomes, but your vote is part of the record.
Appraisal Rights
If you believe the buyout price undervalues the company, you can exercise appraisal rights, a legal process where a court independently determines the fair value of your shares. This remedy is available in many states for statutory mergers, but the procedure is strict. You must deliver a written demand for appraisal before the shareholder vote, vote against the merger or abstain, and refuse the merger consideration. If the court finds your shares are worth more, you receive the higher amount plus interest. If it finds they’re worth less, you’re stuck with that figure instead of the merger price. Proceedings can take years and involve significant legal costs, so appraisal is realistic mainly for holders with large positions and strong conviction that the price is wrong.
If You Do Nothing
In a statutory merger, your shares convert to the right to receive the merger consideration automatically, whether you vote or not and whether you return paperwork or not. You don’t lose your money by ignoring the process, but you can delay getting it.
Brokerage account holders don’t need to do anything. The proceeds appear. The only real task is checking your cost basis when tax season arrives.
Physical certificate holders face a real deadline. The exchange agent holds your consideration in trust until you return the Letter of Transmittal and your certificates. If you never respond, the funds sit with the exchange agent for a period, often one to three years depending on the merger agreement, and are eventually turned over to your state’s unclaimed property office. Recovering the money then means filing a claim with the state, which works but takes time. If you’ve moved and never got the exchange agent’s letters, searching your state’s unclaimed property database is worth the few minutes it takes.