What Is a Bonus Share vs a Stock Split?

A bonus share is an additional share issued by a company to its existing shareholders free of cost, in proportion to their current holdings. No new money changes hands. The company does not receive any fresh capital, and the shareholder does not pay anything. The shares simply appear in your demat account on the record date.

The shares are not conjured from nowhere. A company builds up reserves over its profitable years: retained earnings, the securities premium account, the capital redemption reserve and other free reserves that sit on the balance sheet. A bonus issue converts a portion of these accumulated reserves into paid-up share capital. The total equity on the balance sheet stays the same; only the split between the capital account and reserves changes. The reserves go down, the paid-up capital goes up by the same amount.

Bonus issues are expressed as a ratio. A 1:1 bonus means one additional share for every one share held. A 2:1 bonus means two additional shares for every one held. A 3:2 bonus means three additional shares for every two held. If you held 100 shares before a 1:1 bonus, you hold 200 shares after. The share price on the exchange adjusts downward on the ex-bonus date to reflect the larger number of shares in circulation, so your total investment value does not change on that day.

A bonus issue moves money from a company's reserves into its share capital. No new money enters; the pie is simply cut into more pieces.

Companies announce bonus issues for several reasons, and reading those reasons correctly matters more than the mechanical fact of the issue itself.

• To reward loyal shareholders without distributing cash. When a company has accumulated large reserves but prefers to retain cash for growth, a bonus issue is a way to give shareholders something tangible without depleting liquidity.

• To improve the liquidity of the stock. A high share price can make a stock feel inaccessible to smaller retail investors. By doubling the number of shares and halving the price, the company brings more buyers into the market, which can improve trading volumes.

• To signal confidence. Issuing bonus shares requires the company to capitalise its reserves. Management would not typically do this unless they were confident about the company's future earnings and did not need those reserves as a buffer.

• To improve the earnings per share optics in future. After a bonus issue, the share count is higher. If the company grows its profits, the earnings per share will rise from a reset base, which can look impressive in annual reports.

None of these reasons change the fundamental value of the company. The total market capitalisation on the ex-date is the same as it was before. What a bonus issue can do, over time, is improve liquidity and sometimes attract fresh investor interest, which may contribute to price discovery.

A stock split is a corporate action in which a company reduces the face value of each share by a fixed ratio and simultaneously increases the number of shares outstanding by the same ratio. The total paid-up capital of the company remains unchanged. What changes is the denomination of each share.

In India, shares have a face value, also called the nominal value or par value, which is distinct from the market price. Common face values are Rs 10, Rs 5, Rs 2 and Re 1. When a company splits its stock in a 2:1 ratio, each existing share with a face value of Rs 10 becomes two shares with a face value of Rs 5 each. The market price per share halves accordingly. The number of shares you hold doubles. Your total investment value stays the same.

A 5:1 split turns one share of face value Rs 10 into five shares of face value Rs 2. A 10:1 split turns one Rs 10 share into ten Re 1 shares. SEBI permits face values of Re 1, Rs 2, Rs 5 and Rs 10 for listed companies, so the minimum face value sets a floor on how far a company can split.

A stock split changes the face value and price per share but leaves the company's total capital and your total holding value completely unchanged.

The primary motivation for a stock split is almost always affordability and liquidity. When a company's share price has risen to several thousand or even tens of thousands of rupees per share over many years, the stock becomes difficult for retail investors to buy in meaningful quantities.

A split brings the price per share down to a range that more investors can comfortably transact in, which typically increases the number of buyers and sellers and improves market liquidity.

• Price accessibility. A share trading at Rs 20,000 is out of reach for an investor with Rs 10,000 to deploy. After a 10:1 split, the same share trades at Rs 2,000, and the investor can buy five shares.

• Improved market depth. More affordable shares attract more participants, which narrows the bid-ask spread and makes the stock easier to trade without moving the price significantly.

• Index eligibility. Some indices have price-weighted or quantity-based components where a very high share price can create distortions. A split can make a stock a better fit for inclusion or rebalancing.

• Psychological appeal. Investors sometimes perceive a lower-priced share as more affordable or better value, even when the underlying business has not changed. Companies are aware of this and occasionally use splits to generate fresh interest.

This is where the two actions diverge most clearly, and it is worth spending a moment on the balance sheet to see why.

In a bonus issue, the company moves money from its reserves to its share capital. The total equity stays the same, but its composition changes. Reserves fall; paid-up capital rises. Because reserves are being used up, a company can only issue bonus shares to the extent its free reserves allow. A company with thin reserves cannot announce a large bonus issue.

In a stock split, nothing moves on the balance sheet at all. The paid-up capital is the same. The reserves are the same. Only the face value per share and the number of shares change. A stock split is a purely arithmetic adjustment. The company does not need any reserves to execute it; it only needs SEBI and shareholder approval and a clean register.

Feature	Bonus Issue	Stock Split
Mechanism	Reserves converted into paid-up share capital	Face value reduced; share count increased proportionally
Effect on reserves	Reserves decrease	No change to reserves
Effect on paid-up capital	Increases	No change (same total capital, lower face value per share)
Requires free reserves?	Yes, must have sufficient free reserves	No reserves needed
Effect on face value	No change to face value	Face value reduces proportionally
Effect on share price	Adjusts down on ex-bonus date	Adjusts down on ex-split date
Effect on total market cap	No change on ex-date	No change on ex-date
Effect on EPS (immediately)	EPS falls as share count rises	EPS falls as share count rises
Shareholder approval	Required (ordinary resolution)	Required (ordinary resolution)
SEBI notification	Required	Required

On the day the bonus or split takes effect, the practical impact on your portfolio is almost identical: more shares, lower price per share, same total value. But there are a few things that genuinely change and are worth tracking.

Your average cost of acquisition changes. If you bought 100 shares at Rs 500 each, your cost basis is Rs 50,000. After a 1:1 bonus, you hold 200 shares. Your total cost is still Rs 50,000, but your cost per share is now Rs 250. This matters when you eventually sell, because your capital gains calculation is based on the adjusted cost per share. For bonus shares specifically, SEBI and the Income Tax Act treat the cost of acquisition of bonus shares as zero, which means when you sell them, the entire sale price is treated as capital gain.

For a stock split, the cost of acquisition per share is adjusted proportionally. If you paid Rs 500 for a share and it splits 2:1, your cost of acquisition per share becomes Rs 250 for each of the two shares. The total cost basis remains the same.

Your dividend per share also adjusts. Companies usually maintain or adjust their dividend per share after a bonus or split to reflect the new share count, so the total dividend income you receive on your holding tends to stay comparable, though this depends entirely on the company's dividend policy.

Tax Treatment in India

Tax Aspect	Bonus Shares	Stock Split
Cost of acquisition	Zero for bonus shares received; original shares retain original cost	Adjusted proportionally across new share count
Capital gains on sale	Entire sale price of bonus shares is capital gain	Gain calculated on adjusted cost per split share
Holding period	Counted from date of allotment of bonus shares, not original purchase	Holding period of original shares carries forward
LTCG threshold	Hold bonus shares more than 12 months for LTCG treatment	Same 12-month threshold applies to split shares
Tax rate (LTCG on equity)	12.5% on gains above Rs 1.25 lakh per year (as of FY2025-26)	Same rate applies

The zero cost of acquisition on bonus shares is one of the most important tax points for long-term investors to understand. If you received bonus shares in 2020 and sell them in 2026, the full sale price is your capital gain, subject only to the Rs 1.25 lakh LTCG exemption threshold applicable in that year. This can significantly affect your tax planning if you hold large quantities of bonus shares from a company whose price has risen substantially.

Common Misconceptions

A few ideas about bonus issues and splits persist among retail investors that are worth addressing directly.

• 'Bonus shares are free money.' They are not. The total value of your holding does not increase on the ex-date. What changes is the number of units representing the same underlying value. If the company performs well after the bonus, the price may rise, but that is because of business performance, not because of the bonus itself.

• 'A stock split makes the company cheaper to buy.' The price per share falls, but the company's market capitalisation does not. You are buying the same slice of the same business at the same effective price; you just need fewer rupees per share unit.

• 'A bonus issue means the company is doing well.' It often signals confidence and accumulated reserves, which are positive indicators. But not every bonus issue reflects genuine strength. Some companies have issued bonuses from reserves built over many years even as their current business deteriorated. Read the announcement alongside recent financials.

• 'A split always boosts the share price.' There is no mechanical reason why a split should increase price. Any post-split price increase is driven by improved liquidity, broader retail participation, or market sentiment, none of which are guaranteed.

A Side-by-Side Example

Suppose you hold 100 shares of a company at Rs 1,000 each. Your holding is worth Rs 1,00,000.

Scenario	Before Action	After Action
1:1 Bonus Issue	100 shares at Rs 1,000 = Rs 1,00,000	200 shares at Rs 500 = Rs 1,00,000
2:1 Stock Split (Rs 10 to Rs 5 face value)	100 shares at Rs 1,000 = Rs 1,00,000	200 shares at Rs 500 = Rs 1,00,000
2:1 Bonus Issue	100 shares at Rs 1,000 = Rs 1,00,000	300 shares at Rs 333 = Rs 99,900 (rounding)
5:1 Stock Split (Rs 10 to Rs 2 face value)	100 shares at Rs 1,000 = Rs 1,00,000	500 shares at Rs 200 = Rs 1,00,000

The table makes clear that the immediate financial outcome is the same: total value is preserved, more shares at a lower price. The differences emerge in the balance sheet treatment, the tax cost of acquisition, and the holding period clock for the new shares.

Both bonus issues and stock splits are material corporate events that must be disclosed to the stock exchanges under SEBI's listing obligations. You will find announcements on the BSE and NSE websites under the corporate actions section for any listed company. Your broker's app will usually also notify you if a stock in your portfolio has an upcoming bonus or split.

The key dates to track are the record date (the date on which you must hold shares to be eligible) and the ex-date (the trading day on which the price adjusts and new buyers are no longer entitled to the action). To benefit from a bonus issue or split, you must hold shares before the ex-date.

Disclaimer: This article is for educational purposes only and does not constitute financial, tax or investment advice. Tax rules cited reflect provisions as understood for FY2025-26 and are subject to change. Please consult a SEBI-registered adviser or qualified tax professional for advice specific to your situation. Equity investments are subject to market risk.