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Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minuteA routine stock split generally creates no immediate U.S. federal income tax. You receive more shares representing the same ownership interest, so your total basis stays the same while the basis assigned to each share changes. For a 2-for-1 split, 100 shares with a $15 basis per share become 200 shares with a $7.50 basis per share.
The work that matters is your recordkeeping: recalculate every purchase lot, preserve its original acquisition details, and verify the broker’s figures before you sell or file a return.
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What a stock split changes for tax purposes
In an ordinary split, the company increases the number of shares outstanding for each shareholder while dividing the represented value among those shares. The Internal Revenue Service states that a stock split is not itself a taxable event: receiving the additional shares does not create reportable income merely because the share count increased.
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1Repair Windows errors before they cause bigger problems2Fix the driver behind crashes, sound loss and screen glitches3Clear out junk files and repair common Windows errorsYour overall basis is not reset by the split. Instead, the same total basis is spread over the new number of shares. That distinction matters later, because a sale uses the adjusted basis of the particular shares sold to determine the reportable gain or loss.
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The IRS describes the result this way: “No. Stock splits don’t create a taxable event; you merely receive more stock reflecting the same ownership interest in the corporation that issued the stock.” It also says, “Your overall basis doesn’t change as a result of a stock split, but your per share basis changes.”
A simple 2-for-1 illustration
| Item | Before split | After 2-for-1 split |
|---|---|---|
| Shares | 100 | 200 |
| Basis per share | $15.00 | $7.50 |
| Total basis | $1,500 | $1,500 |
The $1,500 figure is unchanged; only the number of shares and the per-share allocation move. Keep the same acquisition date and lot identity with the original investment so that a later sale can be matched to the correct basis and holding period.
How to recalculate basis, lot by lot
Do not treat a split as one blended adjustment if you bought shares at different times or prices. Each purchase lot has its own quantity, total basis, acquisition date and potential holding period. Apply the split to every lot separately.
- Record the exact split ratio. Use the issuer’s corporate-action notice or your account statement. A 2-for-1 split means each old share becomes two new shares, so the share-count factor is 2.
- List every affected purchase lot. Include the purchase date, original quantity, purchase price and commissions or other purchase costs that belong in basis. Keep dividend-reinvestment purchases and earlier basis adjustments as separate entries when your records identify them separately.
- Multiply the lot’s share count by the split factor. For a 2-for-1 split, 100 shares become 200 shares. The lot’s total adjusted basis does not change solely because of the split.
- Recompute the per-share basis. Divide the unchanged total basis for that lot by its new share count. The resulting amount is the post-split basis per share for that lot.
- Check other legitimate adjustments. Basis generally starts with purchase price plus purchase costs. Add or subtract any prior adjustment that already applies to the lot before calculating the new per-share figure; the split itself is not an additional cost or deduction.
- Save the evidence. Retain the issuer’s split notice, trade confirmations, statements from before and after the action, and the broker’s updated basis record with your lot ledger.
You can express the calculation as:
new share count = old share count × split factornew per-share basis = unchanged lot total basis ÷ new share count
Worked example with two lots
Suppose you bought 100 shares for $10 each in one transaction and another 100 shares for $12 each in a separate transaction. Both lots undergo the same 2-for-1 split.
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| Lot | Original shares | Original total basis | Shares after split | Post-split basis per share |
|---|---|---|---|---|
| Lot A | 100 | $1,000 | 200 | $5.00 |
| Lot B | 100 | $1,200 | 200 | $6.00 |
| Combined position | 200 | $2,200 | 400 | Varies by lot |
The combined account now shows 400 shares and $2,200 of total basis, but the ledger must still show 200 shares at $5 per share in Lot A and 200 shares at $6 per share in Lot B. Blending them into a single $5.50 figure can produce the wrong result when you sell only part of the position.
What happens when you sell split-adjusted shares
At sale, the relevant calculation is the sales proceeds minus the adjusted basis of the shares sold. The split changes the basis allocation before that calculation; it does not create a gain or loss by itself.
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If you can adequately identify the shares sold and notify your broker, the basis generally follows those specific shares. For example, if you direct the broker to sell shares from Lot A, use Lot A’s $5 post-split basis per share rather than Lot B’s $6 figure. Keep the broker’s confirmation showing which lot was selected.
FIFO when no lot is identified
If you cannot adequately identify the shares, first-in, first-out (FIFO) generally applies. Under FIFO, the oldest available shares are treated as sold first. After a split, “oldest” refers to the original acquisition dates carried through each split-adjusted lot, not to the date the extra shares appeared in the account.
Average-basis exceptions
Special average-basis rules can apply to some mutual funds and dividend-reinvestment plans. Those rules are separate from the ordinary stock-lot method described above. Confirm that your security and account qualify before substituting an average figure for identified lots.
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Covered and noncovered securities on Form 1099-B
For covered securities, the broker generally reports the acquisition date, holding period, cost or other basis, and wash-sale information on Form 1099-B. A split should be reflected in the share quantity and per-share basis while preserving the lot information needed for the sale.
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Why a broker’s basis can differ from yours
- The position predates the covered-security reporting rules.
- A historical split was not applied correctly to an older lot.
- Commissions, fees, dividend-reinvestment purchases or earlier adjustments are missing from the broker’s history.
- Shares moved between accounts or brokers without a complete transfer of lot data.
- A corporate action created fractional shares or cash in lieu, which requires separate treatment.
Investor.gov cautions that not all basis adjustments may appear on an account statement. Compare the statement with your confirmations and corporate-action records instead of assuming the displayed number is complete.
How to correct an incorrect 1099-B basis
A wrong broker figure does not mean you should change the broker’s form. Use the form as issued, calculate the correct adjusted basis from your records, and report the correction through the federal capital-gains forms.
- Reconcile the sale to your lot ledger. Confirm the number of shares sold, the original acquisition lot, the split factor, the lot’s unchanged total basis and all other valid adjustments.
- Compare the corrected basis with Form 1099-B. Identify the exact difference and preserve the broker’s form and your supporting calculation together.
- Enter the sale on Form 8949. Use the adjustment procedure for a basis reported incorrectly by the broker. Follow the form’s current instructions for the appropriate adjustment code and amount.
- Carry the corrected result to Schedule D. Schedule D receives the gain or loss after the Form 8949 adjustment, along with the other required transaction totals.
- Keep a durable file. Save the Form 1099-B, Form 8949 and Schedule D copy with the lot calculation, split notice, confirmations and any written broker correction.
If the discrepancy involves more than a straightforward split allocation, or if you cannot establish the original lot, obtain tax advice before filing. The adjustment procedure is for reporting the correct transaction; it is not a license to estimate a basis that your records cannot support.
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Records to keep after a split
Build a file that lets another person reproduce the basis calculation years later, when the shares may finally be sold. Include:
- Original purchase confirmations showing dates, quantities and prices.
- Commission and fee details that belong in purchase basis.
- Dividend-reinvestment records and statements for reinvested purchases.
- The issuer’s corporate-action or split notice stating the ratio and effective date.
- The account statement immediately before the split.
- The first statement after the split showing the new share count.
- Your lot-by-lot worksheet showing unchanged total basis and recalculated per-share basis.
- The broker’s updated cost-basis record and any written response correcting an error.
- Sale confirmations identifying the lot selected, when specific identification was used.
- Forms 1099-B, 8949 and Schedule D for the year of sale.
Retain the original acquisition date with every lot. A future sale may depend on that date to determine which shares were sold and how the transaction is categorized on the tax forms.
Choosing a reporting approach when records and broker data conflict
| Situation | Approach | What you must preserve |
|---|---|---|
| You can identify the exact shares sold | Use the identified lot’s split-adjusted basis | Broker confirmation or other record showing the selected lot |
| You cannot identify the shares sold | Apply FIFO unless a specific exception applies | Chronological lot history and the account’s share movements |
| The security is covered | Review the broker-reported basis and correct demonstrable errors | Form 1099-B, split documentation and your reconciliation |
| The security is noncovered or predates applicable reporting dates | Reconstruct basis from your own records | Confirmations, statements, reinvestment records and prior adjustments |
| The 1099-B basis is wrong | Report the corrected amount through Form 8949 and Schedule D | Calculation, supporting documents and any broker correspondence |
| The transaction is unusually complex | Use current tax software that supports Form 8949 and Schedule D or consult a tax professional | Complete transaction history and the professional’s work papers |
Common mistakes and how to avoid them
Reporting the extra shares as income
Do not enter the additional shares as dividends, wages or other income merely because the account balance shows more shares. The ordinary split itself does not create reportable income under the IRS treatment described above.
Leaving the old per-share basis unchanged
Keeping $15 as the per-share basis after a 2-for-1 split would double the apparent total basis and understate a later gain. Recalculate the per-share amount by dividing the unchanged lot total by the new share count.
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Blending lots with different prices
A single account-level average can hide different acquisition dates and bases. Maintain the $5 and $6 post-split lots in the worked example rather than replacing them with one blended number.
Relying only on the current statement
Statements can omit historical adjustments. Compare them with confirmations, reinvestment records and the split notice, as Investor.gov advises.
Assuming every split-related event is covered by this method
A routine stock split is different from a merger, reorganization, gift, inheritance, employee-equity event, option transaction or a payment for fractional shares. Those events can have different basis and reporting rules.
Situations this guide does not resolve
The procedures here address ordinary stock splits under U.S. federal rules. They do not determine state tax treatment, which can differ by jurisdiction. They also do not provide rules for gifts, inherited securities, employee equity, mergers or reorganizations, options, or fractional-share cash-in-lieu payments. For any of those situations, use the governing authority for the transaction and consider professional advice.
The same caution applies when records are incomplete, shares moved between institutions, or a broker cannot explain a historical adjustment. Establish the lot history before filing rather than relying on an unsupported number.
Quick Recap
A practical pre-filing checklist
- Confirm the issuer’s split ratio and effective date.
- Multiply each lot’s share count by the split factor.
- Leave each lot’s total basis unchanged for the split itself.
- Recalculate each lot’s per-share basis.
- Carry forward the original acquisition date and lot identity.
- Add purchase costs and other documented basis adjustments that already apply.
- Decide whether the sale used specific identification or FIFO.
- Compare your result with Form 1099-B.
- Use Form 8949 and Schedule D if the reported basis needs correction.
- Archive confirmations, statements, split notices and calculations.
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