When a company you own stock in is bought, each of your shares converts into whatever the merger agreement says: a set cash amount, a set number of shares in the acquiring company, or a combination of the two. What happens to your stock when a company is bought is usually handled automatically by your broker at closing, and the tax bill (if any) depends on which form of payment you end up with. The old ticker eventually disappears from your account, replaced by the new consideration.
The Wait Between Announcement and Closing
Deals rarely close quickly. Several months is typical, and regulatory review or a contested shareholder vote can stretch that further. During the wait, the target’s stock keeps trading, but it behaves differently than before.
Once the acquisition is announced at a premium, the target’s price jumps toward the offer price without quite reaching it. That small gap is the market’s uncertainty discount, priced in against the chance that regulators block the deal, shareholders vote it down, or financing falls apart. You can sell into that price at any point before closing and take roughly the offer amount, minus the discount. That’s the escape hatch if you don’t want to wait.
Hold through closing and you generally don’t have to do anything. Your brokerage coordinates the swap on your behalf and the position updates on its own.
Cash, Stock, or Both
The merger agreement dictates the form of payment. Three patterns cover almost every deal.
In an all-cash acquisition, you receive a fixed dollar amount per share. Your ownership ends. The old shares vanish, the cash lands in your account, and you have no further stake in the combined company.
In an all-stock deal, each of your shares converts into a set number of acquirer shares based on the exchange ratio. A 0.75 ratio means 0.75 shares of the acquirer for every share of the target you held. You stay invested, now as a shareholder of the buyer.
Mixed deals pay both. The agreement usually caps how much total cash and how much total stock is available, and shareholders may be allowed to elect their preference. If elections exceed the caps, proration reduces everyone’s chosen form proportionally and makes up the balance in the other. That’s how the acquirer keeps its planned capital structure intact after closing.
Fractional Shares
Exchange ratios rarely produce whole numbers. Acquirers typically don’t issue fractional shares. Instead, the fraction is sold and you receive a small “cash in lieu” payment calculated from the acquirer’s stock price around closing. If your entitlement works out to 47.6 shares, you get 47 shares plus cash for the 0.6. The IRS treats that small payment as a sale of the fractional share, so gain or loss is recognized only on that sliver against its proportional cost basis.
How Your Shares Actually Change Hands
After the shareholder vote and regulatory sign-offs, the deal moves to closing. The acquirer appoints an exchange agent, a third-party financial institution, to run the mechanical swap.
If your shares sit in a brokerage account, the exchange is automatic. Your broker coordinates with the exchange agent, and within a few business days of closing your old position is replaced by cash, new shares, or both. No paperwork on your end.
If you hold paper stock certificates, that changes. The exchange agent mails you a letter of transmittal, which is the form that tells them to surrender your certificates and where to send your payment. You have to fill it out, include your tax identification number, and send the certificates back. Until you do, nothing gets released.
If You Ignore the Paperwork
Unclaimed proceeds don’t stay put. After a defined period, the exchange agent returns the funds to the acquiring company. From there, state unclaimed property laws take over. Every state has an escheatment statute that requires companies to turn over dormant assets after a dormancy period, generally three to five years depending on the state and the type of property. Your money then sits with the state’s unclaimed property office waiting for you to file a claim. Responding to merger mail avoids the whole detour.
What You’ll Owe in Taxes
Cash Deals
Cash received in an acquisition is a taxable event. You subtract your cost basis from the cash proceeds to calculate capital gain or loss, and the holding period determines whether it’s short-term or long-term. The transaction goes on IRS Form 8949, with totals flowing to Schedule D of your Form 1040.1Internal Revenue Service. About Form 8949, Sales and Other Dispositions of Capital Assets Your brokerage or the exchange agent will issue a Form 1099-B showing the proceeds.2Internal Revenue Service. Instructions for Form 8949
Stock Deals
When you receive only stock in the acquirer, the transaction can qualify as a tax-free reorganization under IRC Section 368.3Office of the Law Revision Counsel. 26 USC 368 – Definitions Relating to Corporate Reorganizations If it qualifies, Section 354 says you recognize no gain or loss at the time of the exchange.4Office of the Law Revision Counsel. 26 USC 354 – Exchanges of Stock and Securities in Certain Reorganizations You don’t owe anything until you eventually sell the acquirer’s shares. Your old cost basis carries over to the new shares, preserving the deferred gain.
Mixed Deals
When you get both cash and stock, the stock side can still qualify for tax deferral, but the cash portion (called “boot”) triggers gain recognition. Under Section 356, you recognize gain up to the amount of cash received, but only to the extent you actually have a gain on the overall transaction.5Office of the Law Revision Counsel. 26 USC 356 – Receipt of Additional Consideration If your basis exceeds the total deal value, you have a loss, and the cash portion doesn’t manufacture a taxable gain out of nothing. The stock keeps its carryover basis, adjusted for any gain recognized on the cash.
Watch for the Wash Sale Rule
If the deal produces a capital loss and you receive shares of the acquirer as part of it, be careful with the wash sale rule. IRC Section 1091 disallows a loss deduction on a sale of stock if you acquire “substantially identical” stock within 30 days before or after.6Office of the Law Revision Counsel. 26 USC 1091 – Loss From Wash Sales of Stock or Securities Target stock and acquirer stock are usually different securities, but the IRS could argue otherwise in narrow situations, particularly where the target was already a subsidiary of the acquirer. If you sold target shares at a loss shortly before or after the merger, talk to a tax professional before claiming the deduction.
Shares Held in an IRA or 401(k)
If your target company stock is inside a traditional IRA, Roth IRA, or 401(k), you can set the tax question aside. Cash proceeds simply raise the account’s cash balance. New shares from an all-stock deal drop into the same account. Nothing is owed until you take a distribution (or ever, for a qualifying Roth). The custodian handles the exchange for you.
If You’re an Employee With Options or RSUs
Employees of the target company have more to sort through than ordinary shareholders. Vested options and fully vested RSUs convert into the deal consideration just like regular shares. The harder question is what happens to unvested equity.
Unvested awards are generally handled in one of four ways, depending on the merger agreement and your original grant terms:
- Conversion into equivalent unvested awards in the acquiring company, with adjusted exercise prices and vesting schedules.
- Acceleration, where unvested awards vest immediately at closing and you receive the deal consideration. “Single-trigger” acceleration kicks in automatically on a change of control. “Double-trigger” acceleration requires both the acquisition and a termination or significant change to your role.
- Cash-out, where the acquirer pays cash equal to the spread between your exercise price and the deal price (for options) or the full deal price (for RSUs), and cancels the awards.
- Cancellation with no payment, which sometimes happens to underwater options where the exercise price is above the deal price.
The specific treatment lives in the merger agreement and your company’s equity plan documents. Read them as soon as you hear serious acquisition talk. The window to make decisions closes fast.
If You Think the Price Is Too Low
Most states give shareholders who disagree with the deal price the right to demand a judicial determination of “fair value” and be paid that amount in cash instead. These are called appraisal rights, or dissenter’s rights.
The procedure is strict. You must vote against the merger (or abstain) and file a written demand for appraisal before the shareholder vote. After closing, you petition a court to set the fair value of your shares. The court’s number can come in higher, lower, or equal to the deal price. Judges often lean on the deal price itself as the best indicator of fair value when the sales process was competitive and free of conflicts, and they may look to the unaffected pre-announcement market price when the process had problems.
Appraisal is slow and expensive. Your capital is tied up for the duration of the litigation, which can run over a year, and the court’s valuation might land below the deal price. This path really only fits large institutional holders with the resources to litigate and a strong view that the price was struck at a significant discount. For most individual investors, selling on the open market before closing is the more practical response to a price you don’t like.
If the Deal Falls Through
Not every announced acquisition closes. Regulators can block it, shareholders can vote it down, or financing can collapse. If the merger fails, your shares stay exactly as they were. The company continues as an independent public company, and the stock price usually drops back toward its pre-announcement level, sometimes below it if the failed deal signals deeper problems. Any elections you made in anticipation of closing are unwound. You’re back to being a regular shareholder of the same company you started with.