When a company you own is acquired, your old shares are handled according to the merger or acquisition agreement. They may be exchanged for cash, converted into shares of the acquiring company, or replaced with a combination of stock and cash. Whether you owe U.S. federal tax immediately depends mainly on that consideration, the transaction’s tax structure, your adjusted basis and holding period, and your circumstances.
Start with the deal notice: identify the consideration, any election or proration, and the closing or effective date. Then locate your basis and purchase dates, and compare the issuer’s tax disclosure with your broker’s reporting. An acquisition by itself does not determine your tax bill.
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What happens to your shares at closing?
The merger agreement and related proxy or information statement control what happens to the legal position represented by your shares. At the effective time, the old shares commonly cease to trade and are either cancelled in exchange for the stated consideration or converted into a specified number of successor shares.
All-cash consideration
In an all-cash deal, each old share is exchanged for a stated cash amount, subject to terms such as withholding, escrow, appraisal rights, or adjustments described in the transaction documents. Once the transaction closes, you generally no longer own the acquired company’s shares. The cash payment is usually treated as proceeds from a disposition for federal-tax purposes, but read the transaction’s tax section before filing.
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Acquirer stock
A stock transaction can replace your old shares with shares of the acquiring company or another successor. The exchange ratio, treatment of odd lots, and whether you can elect cash instead of stock appear in the merger materials. A stock exchange is not automatically tax-free; only transactions meeting the requirements of a qualifying reorganization receive the applicable nonrecognition treatment.
Cash and stock together
Mixed consideration gives you replacement shares plus cash, sometimes called cash boot. The agreement may set a fixed mix, allow elections, or apply proration if shareholders request more cash or stock than the deal permits. The amount and type of cash matter for tax reporting, and cash paid for a fractional share can be treated differently from cash boot.
Tax treatment by transaction path
The following comparison is a practical starting point, not a substitute for the deal-specific tax disclosure.
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1Clear out junk files and repair common Windows errors2Fix the driver behind crashes, sound loss and screen glitches3Repair Windows errors before they cause bigger problems| Deal path | What happens to the position | Typical U.S. federal tax pattern | Important qualification |
|---|---|---|---|
| All cash | Old shares are exchanged for cash and normally cease to be your position after closing. | Gain or loss is generally measured by comparing proceeds with adjusted basis. A holding period of more than one year can make the result long-term in a taxable disposition. | A 2026 SEC-filed merger disclosure describes this pattern for that particular deal; the transaction’s own tax section controls. |
| Qualifying stock-for-stock reorganization | Old shares are exchanged or converted into shares of the acquirer or successor. | Some qualifying reorganizations permit nonrecognition, with basis carried into the replacement shares. | Not every stock deal qualifies. The legal structure and tax disclosure must be examined. |
| Cash plus stock | You receive replacement stock and cash. | In some qualifying mergers, gain may be recognized up to the cash or other non-stock property received, while basis in the new stock is determined under the applicable rules. | IRS instructions give a specific example; do not apply that formula to every mixed deal. |
| Cash for a fractional share | A fraction of a replacement share is paid in cash instead of being delivered. | The fractional interest may be treated as stock that was redeemed or sold, with gain or loss measured under the regular adjusted-basis approach. | Check the issuer’s notice and broker statement because this treatment is distinct from merger cash boot. |
How an all-cash exchange is taxed
For a taxable cash exchange, the basic calculation is:
Amount realized (cash proceeds) − adjusted basis = capital gain or loss.
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Adjusted basis normally starts with what you paid, including applicable transaction costs, and can change because of earlier sales, reinvestments, corporate actions, or other adjustments. Use your own records and the deal statement rather than assuming the broker’s number is complete.
A 2026 merger disclosure filed with the Securities and Exchange Commission states that, for its U.S. holders, receiving cash generally produces taxable gain or loss equal to the difference between the cash received and adjusted basis. It also says the result is generally capital and generally long-term when the shares have been held for more than one year at closing. That language is an example from one transaction, not a universal conclusion for every acquisition. Read the disclosure filed for your deal at the SEC filing.
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What the holding period changes
Your acquisition date and the closing date determine how long you held the old shares. If a taxable disposition occurs after more than one year, the gain or loss is generally long-term; a shorter period is generally short-term. Keep the original trade confirmation and any records of later basis adjustments so you can establish the period accurately.
When a cash payment is less than your basis
If the proceeds are below adjusted basis, the difference can be a capital loss in a taxable disposition, subject to the normal rules and limits that apply to capital losses. Do not infer a loss merely because the share price fell: use the actual proceeds, including any specified adjustments in the transaction documents.
When stock received can defer tax
Some acquisitions are structured as reorganizations that meet federal requirements for nonrecognition. In that setting, exchanging old shares for replacement shares can defer recognition rather than producing an immediate taxable sale. The replacement shares generally take a basis determined from the old shares under the reorganization rules, with adjustments for any recognized gain, cash, or other property.
IRS Publication 550 (2025) discusses this context and states: "If this is a result of a merger, recapitalization, transfer to a controlled corporation, bankruptcy, corporate division, corporate acquisition, or other corporate reorganization, you do not recognize gain or loss." The sentence appears within the publication’s discussion of transactions that meet the described reorganization conditions; it is not a blanket exemption for every corporate acquisition. The publication also illustrates an exchange in which an investor receives 70 shares of a successor company for shares of the original company. Review the full discussion in IRS Publication 550.
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Tax deferral does not erase basis. In a qualifying exchange, your old basis generally carries into the new shares, adjusted for the transaction’s terms and any recognized amounts. The number of replacement shares, their fair value, cash received, and fractional-share payment all belong in your records. Your broker may show a basis that needs correction after the corporate action is processed.
How mixed cash-and-stock consideration works
Mixed consideration is where many shareholders make an avoidable mistake: receiving some stock does not automatically make the entire exchange tax-free, and receiving some cash does not necessarily make the entire exchange taxable. The transaction must be tested under its particular reorganization rules.
The IRS Instructions for Form 1099-B (2026) include a worked example for a merger described as taxable only to the extent that cash or property other than stock or securities (boot) is received. In that example, the shareholder has a $5,000 original basis, receives replacement stock valued at $4,700, and receives $800 cash boot. The instructions illustrate reporting the $800 cash and a $300 net basis reduction, with the new stock basis shown as $4,700. Those are instructional figures for that example, not a universal calculation for every merger.
The same IRS instructions give the reporting principle this way:
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"Report only the net reduction in basis between stock exchanged and stock received when reporting the payment of cash paid as part of a corporate merger, reorganization, or similar event that is taxable only to the extent that cash or property other than stock or securities (“boot”) is received and for which no loss can be recognized."
Because the result depends on whether the transaction qualifies and on the exact consideration, keep the merger tax notice with your calculation. If the notice and the broker’s form appear inconsistent, do not simply choose the more favorable number.
Why fractional-share cash is a separate issue
Stock exchanges often produce a fraction that cannot be delivered. The issuer may calculate the fraction, sell it, and send you cash in lieu. IRS Form 1099-B instructions distinguish this payment from merger cash reported under the special net-basis-reduction approach.
For a fractional interest treated as redeemed or sold, the regular adjusted-basis method generally applies to that interest: determine the basis allocated to the fraction, compare it with the cash received, and report the resulting gain or loss as directed by the transaction documents and applicable forms. The issuer’s tax notice should say how it handled the fraction, and your broker statement should identify the related proceeds.
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Step-by-step: determine your own outcome
- Get the controlling documents. Save the proxy or information statement, merger-agreement summary, issuer tax notice, and broker corporate-action notice. Find the effective or closing date and the section describing U.S. shareholder tax consequences.
- Identify the consideration. Record the number and class of old shares, the cash per share, the stock exchange ratio, any election you made, and any proration. Note cash paid for a fractional share separately from other cash.
- Confirm the transaction structure. Look for language describing a taxable sale, a reorganization intended to qualify for nonrecognition, or a transaction taxable only to the extent boot is received. Do not infer the structure from the headline announcement.
- Assemble basis records. Gather purchase confirmations, dates, commissions and fees, dividend-reinvestment records, prior corporate-action adjustments, and records from any account transfer. Calculate adjusted basis for each tax lot when lots have different dates or prices.
- Determine the holding period. Match each lot’s acquisition date to the closing date. Separate lots held more than one year from lots held one year or less when the disposition is taxable.
- Reconcile the broker report. Compare the proceeds, basis, acquisition date, and transaction description on Form 1099-B with the deal documents. Corporate actions can cause missing or incomplete basis information.
- Prepare the return entries. If the transaction is a taxable sale or exchange, follow the Form 8949 instructions and carry the result to the appropriate capital-gain schedule. If the exchange is deferred or partially recognized, use the deal’s tax instructions to determine what must be reported now and what basis carries forward.
- Resolve conflicts before filing. If the broker classification conflicts with the issuer’s tax notice or your lot records, seek clarification from the broker and use the transaction documents and a qualified tax professional to resolve the difference.
Forms and broker reporting
Form 1099-B is the broker’s information return for certain proceeds from securities transactions. The IRS explains the form and broker-reporting framework on its About Form 1099-B page. The 2026 instructions at Instructions for Form 1099-B address reporting when shareholders receive cash, stock, or other property in acquisition-of-control and capital-structure-change events, including how basis reporting depends on the transaction’s treatment.
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A 1099-B is useful evidence, but it is not necessarily the final word on a complicated corporate action. Brokers may report a default basis, omit basis for older lots, or process a merger before the issuer publishes its final tax notice. Retain both the form and the underlying records.
For a taxable disposition, the IRS Instructions for Form 8949 (2025) explain how to report sales and exchanges of capital assets and make adjustments when the information return does not match the amount you must report. Follow the form instructions for the applicable tax year rather than copying a prior year’s codes or boxes.
Records to keep after the deal
- The merger proxy, information statement, or plan of merger.
- The issuer’s shareholder tax notice and any election or proration confirmation.
- The broker’s corporate-action notice and Form 1099-B.
- Old share counts, security classes, exchange ratios, cash amounts, and the closing date.
- Purchase confirmations, original cost, commissions, fees, and every prior basis adjustment.
- The calculation allocating basis between replacement shares, cash boot, and any fractional-share payment.
- Records showing which tax lots were held more than one year.
Situations that need separate advice
This overview addresses an individual shareholder’s U.S. federal income-tax questions. State and local taxes can differ, and non-U.S. residents may face withholding, treaty, foreign-country, or residency rules that are not covered here. A foreign issuer can add reporting issues even when the shareholder files a U.S. return.
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Account type and ownership circumstances can also change the practical result. Joint ownership, trusts, retirement accounts, and shares held through an entity may require records or reporting that differ from a standard taxable brokerage account.
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Common mistakes to avoid
- Assuming every acquisition is taxable immediately. Cash, stock, and qualifying reorganizations can have different recognition timing.
- Assuming every stock deal is tax-free. The exchange must satisfy the applicable reorganization requirements.
- Treating all cash alike. Cash boot and cash paid for a fractional share can follow different reporting approaches.
- Using the account’s displayed cost without checking lots. Corporate actions and transferred positions can leave basis incomplete or wrong.
- Ignoring the effective date. The closing date determines when the old shares are exchanged and helps establish the holding period test.
- Reporting the broker’s number without reconciling it. The issuer’s tax notice and your records may require an adjustment.
- Applying U.S. federal rules to another jurisdiction. State, local, foreign, and withholding rules require separate analysis.
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