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The answer also depends on jurisdiction. The rules below separate U.S. federal guidance from UK HM Revenue & Customs (HMRC) guidance; neither set of rules is a universal answer for every country, account type, or corporate action.
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Start with the event, not the label
Companies and brokers sometimes use “bonus shares” loosely. A notice that says “bonus” can describe materially different transactions. Use the legal description, event code, record date, effective date, and any cash-dividend election language in the notice to classify what happened.
| Event | What you receive | Immediate tax or basis principle | Primary evidence |
|---|---|---|---|
| U.S. stock split | More shares representing the same ownership interest | IRS says the split itself is not taxable; total basis stays constant and is spread over the larger share count. | IRS stock-split FAQ |
| Ordinary UK bonus or scrip issue | New shares issued free to existing holders in proportion to their holdings | HMRC’s basic position is that an ordinary bonus issue is not a distribution and is not income, unless specific legislation applies. | HMRC CG50290 and STSM072010 |
| Statutory UK stock dividend | Shares offered instead of a cash dividend | For the statutory category covered by HMRC guidance, the amount treated as received for income tax is treated as the amount paid for capital-gains purposes; the shares are treated as a new acquisition under that rule. | HMRC CG58750 and SAIM5150 |
| U.S. DRIP purchase | Additional shares bought with a dividend | The dividend is included in income. The acquired shares generally take a basis equal to their cost, plus applicable adjustments such as commissions. | IRS DRIP-basis FAQ |
These categories can look similar in a portfolio screen but require different calculations. If the notice is unclear, ask the issuer or broker what corporate-action code and tax treatment they used before entering a figure.
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U.S. stock splits: the classic “free shares” case
No tax at the split itself
The Internal Revenue Service says a stock split does not create a taxable event: you receive more stock evidencing the same ownership interest. You do not report income merely because the share count increased. Tax generally becomes relevant when you later sell shares, because the adjusted basis and holding period determine the gain or loss.
Recalculate per-share basis
Total adjusted basis remains unchanged. Divide that unchanged amount by the new number of shares when all shares in the calculation are identical. The IRS illustration uses 100 shares with a $15 basis per share: total basis is $1,500. After a 2-for-1 split, there are 200 shares, still with $1,500 total basis, so the per-share basis is $7.50.
Do not average together lots that have different costs. Adjust each lot separately so that the original total basis and acquisition date stay attached to the correct shares. The IRS example keeps a $1,000 basis in one lot and a $1,200 basis in another after a 2-for-1 split; each lot’s per-share figure is reduced according to its own new share count.
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Holding period and a later sale
A split changes the number of shares, not the underlying investment represented by each lot. Keep the original acquisition date with the corresponding adjusted lot. When you sell, identify which lot was disposed of under your broker’s selection method and use that lot’s adjusted basis rather than a portfolio-wide average unless your tax rules specifically permit another method.
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UK ordinary bonus and scrip issues
What HMRC means by a bonus issue
HMRC describes a bonus issue as shares issued free to existing holders in proportion to their holdings. Its example says a 1-for-4 issue gives a holder of 100 shares an additional 25 shares. The shares are new shares issued from the company’s authorized share capital; the example does not involve a cash subscription.
Basic income-tax position
HMRC’s capital-gains guidance states that the basic UK position is that an ordinary bonus issue does not give rise to a distribution and is not income in the shareholder’s hands, unless specific legislation applies. That description is not a blanket rule for every transaction called “scrip” or “stock dividend.” Read the offer terms to see whether the company is issuing free bonus shares or satisfying a dividend election.
For capital-gains records, retain the original holding, the number of bonus shares, the ratio, and the dates shown in the corporate-action notice. The correct allocation or pooling treatment can depend on the type of reorganisation and the account in which the shares are held, so use the relevant HMRC guidance or professional advice for a filing position.
Stock dividends and scrip elections are a separate UK category
HMRC notes that “stock dividend” is often used for an offer of extra shares instead of a cash dividend. Its statutory stock-dividend rules are narrower than that everyday wording. Where those rules apply, HMRC says the amount treated as received for income-tax purposes is treated as the amount paid for capital-gains purposes, and the shares are treated as a new acquisition for that rule. The manual states: “TCGA92/S142 provides that if ITTOIA2005/S410 applies to a stock dividend, the taxpayer is treated as though they paid the appropriate amount in cash for the new shares.”
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Do not apply that cash-equivalent basis to every ordinary bonus issue. The dividend statement, election form, and issuer notice should establish whether a taxable dividend was declared and what amount was attributed to the shares. If those documents conflict, keep both and ask the issuer, broker, or a UK tax adviser to resolve the classification.
U.S. dividend reinvestment plans create new tax lots
Dividend income is still income
Under the IRS description of a DRIP, a dividend is included in income even when you instruct the plan to reinvest it. The plan then uses the dividend to purchase additional shares, usually at fair market value on the reinvestment date.
Basis equals the purchase cost, with adjustments
Each reinvestment is a purchase. The basis of the acquired shares is generally their cost plus adjustments such as commissions. A plan with quarterly or monthly reinvestments therefore creates many acquisition lots, each with its own date, number of shares, and cost. Do not combine those lots with a later stock split without first preserving the original DRIP entries.
Reconstructing missing DRIP records
The IRS says missing reinvestment records may need to be reconstructed using public records, your broker, or the issuing company. Keep the dividend statement, reinvestment confirmation, price used, fees, and resulting fractional or whole-share amount. A broker’s current cost-basis display is useful, but it may not contain every historical lot.
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How to calculate and document the adjustment
- Collect the notice. Save the issuer’s corporate-action notice, broker event description, record date, payment or effective date, ratio, and any statement about taxable dividends or cash paid for fractions.
- Classify the event. Mark it as a split, ordinary bonus issue, stock or scrip dividend, or DRIP purchase. If the documents use different labels, do not calculate until the discrepancy is explained.
- Export the pre-event lots. Record each lot’s acquisition date, share count, original cost, commissions, and account. Include covered and noncovered status where your broker reports it.
- Apply the event-specific rule. For a U.S. split, preserve each lot’s total basis and divide it over the post-split shares. For a DRIP, record a new lot at the reinvested purchase cost. For a UK transaction, apply the rule that matches the documented bonus issue or statutory stock dividend.
- Handle fractions separately. Record the fractional entitlement and any cash paid instead of a fraction. The tax treatment of that cash can depend on jurisdiction and the precise corporate action; do not silently add it to basis or income.
- Reconcile the broker file. Compare your calculation with the broker’s post-event quantity, per-share basis, acquisition dates, and holding-period fields. Save any correction or explanation supplied by the broker.
- Store the working paper. Keep the ratio or purchase-price calculation showing how every affected lot changed. A portfolio ledger or record book can organize this information, but it cannot decide the tax classification.
What brokers report—and what they may not
For covered U.S. securities, the IRS says brokers report acquisition date, holding-period classification, basis, and certain adjustments on Form 1099-B. Use that information as a reconciliation point, not as proof that an unusual corporate action was classified correctly.
Brokers did not have to track basis for some older noncovered holdings. In those cases, you may have to determine basis from trade confirmations, statements, dividend records, corporate-action notices, and issuer or public records. If your return uses a broker-provided number that you later correct, retain the reason and supporting calculation.
Portfolio-record checklist
For every affected position, retain:
- Issuer, security identifier, account, and relevant jurisdiction.
- The issuer notice and the broker’s event description or confirmation.
- Event type, record date, effective date, and ratio or reinvestment price.
- Share count before and after the event, including any fractional-share cash payment.
- Every original acquisition lot, date, cost, and purchase expense.
- The per-lot basis allocation and the spreadsheet or worksheet used to calculate it.
- Dividend statements, tax forms, election forms, and DRIP confirmations where applicable.
- Broker-reported basis, holding period, and any correction made on a tax return.
The IRS requires records that identify the basis of capital assets. A durable record should let you answer, years later, which shares were acquired when, what they cost, what corporate action changed their quantity, and how the current basis was derived.
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Calling every free share a split
A split and a bonus issue can both increase the share count, but they are not interchangeable legal events. Use the issuer’s notice rather than the portfolio app’s abbreviated label.
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Assuming reinvestment means tax-free income
In the U.S. DRIP case, the dividend remains income even though no cash reaches your bank account. Record the income and the resulting purchase lot.
Using one average basis for many lots
An average can conceal different acquisition dates and costs. Preserve each lot before applying a split or adding DRIP purchases.
Trusting an incomplete historical broker balance
Older noncovered holdings may not have broker-reported basis. Rebuild the history from confirmations and statements instead of treating a blank or estimated field as final.
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Outbyte Driver Updater FREEFix the driver behind crashes, sound loss and screen glitchesFind Drivers →Outbyte PC Repair FREEClear out junk files and repair common Windows errorsFree Scan →Applying UK stock-dividend wording to an ordinary bonus issue
HMRC’s statutory stock-dividend rule applies to the category described in its guidance. It should not be generalized to every proportional bonus issue or every offer of shares instead of cash.
Which rule applies to your case?
| Question | If yes | Next record or action |
|---|---|---|
| Did the issuer simply multiply the number of identical shares? | Investigate a stock split. | Use the split ratio and recalculate basis per lot. |
| Were free shares issued proportionally with no dividend election? | Investigate an ordinary bonus issue. | Apply the jurisdiction’s bonus-issue rules and retain the notice. |
| Could you choose shares instead of a declared cash dividend? | Investigate a stock or scrip dividend. | Find the dividend statement and any amount attributed to the shares. |
| Was a declared dividend used to buy shares? | That is a DRIP purchase. | Record dividend income and a separate purchase lot for each reinvestment date. |
| Is the holding old or marked noncovered? | Broker basis may be incomplete. | Reconstruct basis from your own records and preserve the calculation. |
When professional advice is warranted
Get jurisdiction-specific advice when the notice uses unfamiliar terms, shares were held across taxable and sheltered accounts, a fractional entitlement was paid in cash, multiple reorganizations affected the same lot, or your broker and issuer show different classifications. The documents determine what happened; your tax return should reflect the documented event rather than the informal phrase “bonus shares.”
For U.S. rules, start with the IRS explanations of splits, basis records, and DRIP purchases at Stocks (options, splits, traders) and the DRIP-basis FAQ. For UK rules, consult HMRC’s current manuals for statutory stock dividends, income-tax treatment, and bonus issues.
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