Bonus shares are generally not taxed when you receive them. The IRS treats a proportional stock distribution as a non-taxable event, so no income is reported on the day the shares land in your account. What changes is your cost basis per share, which drops to reflect the larger share count, and that sets up the tax bill you’ll actually face when you sell. There are a handful of exceptions where bonus shares become taxable on receipt, and there are extra reporting rules if the shares sit in a foreign account, both worth knowing before you assume you owe nothing.
The General Rule: No Tax When You Receive Them
Federal law excludes stock distributions from gross income when a company distributes the same class of stock proportionally to all shareholders of that class.1Office of the Law Revision Counsel. 26 USC 305 – Distributions of Stock and Stock Rights The IRS applies this treatment through Treasury Regulation 1.305-1.2eCFR. 26 CFR 1.305-1 – Stock Dividends
The logic is straightforward. Your ownership percentage in the company hasn’t changed. If you owned 1% before the bonus issue, you own 1% after. The market adjusts the per-share price downward so that total market capitalization stays roughly constant, and your position value stays roughly constant with it. Nothing has been realized, so nothing is taxed. The tax event waits until you sell.
When Bonus Shares Are Taxable on Receipt
Section 305 lists specific situations that pull a stock distribution out of the non-taxable category and treat it as a property distribution. If any of these apply, the value of the shares you receive is taxed as a dividend to the extent of the company’s earnings and profits; anything beyond that reduces your basis, and any excess is treated as a capital gain.3Office of the Law Revision Counsel. 26 USC 301 – Distributions of Property
- Shareholders had the option to take cash (or other property) instead of stock. Even if you personally chose stock, the distribution is taxable to everyone.1Office of the Law Revision Counsel. 26 USC 305 – Distributions of Stock and Stock Rights
- The distribution is disproportionate, meaning some shareholders receive cash while others receive stock in a way that increases the stock recipients’ proportionate interest.4eCFR. 26 CFR 1.305-3 – Disproportionate Distributions
- Some common shareholders receive preferred stock while others receive common.
- The distribution is on preferred stock. A narrow exception exists for conversion-ratio adjustments tied to splits.
- The distribution is of convertible preferred stock, unless the company can show the result won’t be disproportionate.
The cash-or-stock election is the one that most often surprises individual investors. If the company offered any shareholder a cash alternative, the stock dividend is taxable across the board, including for shareholders who never wanted the cash.
How Your Cost Basis Gets Reallocated
For a non-taxable bonus issue, you don’t get a fresh cost basis for the new shares. Instead, the adjusted basis of your original shares is spread across the combined total of old and new shares.5Office of the Law Revision Counsel. 26 USC 307 – Basis of Stock and Stock Rights Acquired in Distributions
An example makes it concrete. You buy 100 shares for $5,000, so your basis is $50 per share. The company declares a 10% bonus issue and you receive 10 more shares. You now hold 110 shares, but your total basis is still $5,000. Divide $5,000 by 110 and your per-share basis is roughly $45.45. Total basis unchanged, per-share basis lower.
If you bought shares in multiple lots at different prices, each lot is adjusted by the same ratio. A 10% share increase reduces each lot’s per-share basis by roughly 9.09%, which is the reciprocal of 1.10.
Most brokerages handle this automatically. Check anyway. If the adjustment doesn’t happen and the old per-share basis carries through to your 1099-B, you’ll appear to have a larger gain than you actually do, and you’ll pay tax on income that isn’t real. This kind of error can sit in an account for years, quietly, until a sale exposes it.
Holding Period and the Rate You’ll Pay at Sale
The holding period for bonus shares tacks back to when you acquired the original shares they came from.6Office of the Law Revision Counsel. 26 USC 1223 – Holding Period of Property If the original shares are already long-term (held more than a year), the bonus shares are long-term from the day they arrive.
Long-term capital gains get preferential rates. For 2026, single filers pay 0% on long-term gains within the first $49,450 of taxable income, 15% above that up to $545,500, and 20% beyond $545,500. Married couples filing jointly reach the 15% bracket at $98,900 and the 20% bracket at $613,700. Short-term gains, on shares held a year or less, are taxed as ordinary income at your marginal rate.
The 3.8% Net Investment Income Tax
Higher earners owe an additional 3.8% net investment income tax on capital gains. The tax applies to the lesser of your net investment income or the amount by which your modified adjusted gross income exceeds $200,000 for single filers or $250,000 for married couples filing jointly.7Office of the Law Revision Counsel. 26 USC 1411 – Imposition of Tax Those thresholds are not indexed for inflation, so they catch more taxpayers every year.8Internal Revenue Service. Net Investment Income Tax
This matters more for bonus shares than it might seem. After years of bonus issues, your per-share basis can be low, and a sale can produce a gain large enough to push your income past the threshold even if your salary alone wouldn’t get you there.
Cash for Fractional Shares
Bonus ratios don’t always divide evenly. Hold 75 shares in a 1-for-10 bonus and you’re entitled to 7.5 new shares. Companies and transfer agents typically don’t issue half shares. They pool the fractional entitlements, sell the resulting whole shares on the market, and pay you cash for your fraction.
That cash is taxable. The IRS treats it as if you received the fractional share and immediately sold it, producing a small capital gain or loss equal to the difference between the cash and the basis allocated to that fraction. If the underlying position is long-term, so is the fractional-share gain. The amount is usually modest, but it belongs on your return.
Reporting the Eventual Sale
When you sell shares that include bonus shares, you report each sale on Form 8949, and the totals flow to Schedule D of your Form 1040.9Internal Revenue Service. About Form 8949, Sales and Other Dispositions of Capital Assets Your brokerage sends a Form 1099-B showing the proceeds and, usually, the cost basis it has on file.
Compare the 1099-B basis to your own records. If the brokerage failed to reallocate basis after a bonus issue, the reported gain will be too high. You correct it using column (g) on Form 8949 with the appropriate adjustment code. The IRS expects these adjustments; they’re routine, and the alternative is paying tax on gains that don’t exist.
State taxes are a second layer. Most states that tax income also tax capital gains, generally at ordinary income rates. A few states have no income tax at all. Federal basis and holding-period rules usually carry through, but confirm your state’s treatment if it has its own capital gains rules.
Foreign Bonus Shares and Extra Reporting
If you hold foreign shares through a foreign brokerage, bonus shares can push the account value across reporting thresholds and trigger two separate filings.
The FBAR (FinCEN Form 114) is required when the combined value of all your foreign financial accounts exceeds $10,000 at any point during the year.10Internal Revenue Service. Report of Foreign Bank and Financial Accounts (FBAR)
Form 8938 kicks in at higher levels. A single filer living in the U.S. must report specified foreign financial assets exceeding $50,000 on the last day of the tax year or $75,000 at any point during the year. Married couples filing jointly double those figures to $100,000 and $150,000.11Internal Revenue Service. Do I Need to File Form 8938, Statement of Specified Foreign Financial Assets Bonus shares add to the values you measure against these limits. If you hold your foreign stocks through a U.S.-based brokerage, these forms generally don’t apply, because the U.S. brokerage handles the reporting.