A capital reserve is an accounting entry in the equity section of the balance sheet that holds gains or proceeds generated from capital transactions rather than from normal business operations. Common sources include selling a fixed asset above its book value, receiving premium above par value when issuing shares, revaluing assets upward to reflect current market prices, and profits from redeeming debentures at a discount. Capital reserves appear under "Reserves and Surplus" in the shareholders' equity section and are not available for distribution as dividends to ordinary shareholders.
Think of a capital reserve like the proceeds from selling your company car: the money is real, but it came from disposing of an asset rather than from selling your product, so it cannot be treated as earned profit.
The protection exists because capital reserves arise from transactions that affected the company's capital base rather than from earnings produced by running the business. If companies could distribute capital reserves as dividends, they could systematically return the capital their shareholders originally invested, depleting the base that protects creditors. Most accounting frameworks and company law provisions, including those derived from the UK Companies Acts and India's Companies Act, restrict capital reserves to specific uses such as issuing bonus shares or writing off preliminary expenses.
When a company issues 100,000 shares at $10 per share with a par value of $1 per share, the $900,000 difference between the issuance price and the par value is credited to the share premium account, also called additional paid-in capital in U.S. accounting. This entry is a capital reserve. It cannot be paid as a dividend, but it can be used to fund a bonus share issue, effectively converting the reserve into paid-up share capital.
When a company redeems preference shares or buys back its own ordinary shares at par, it reduces its issued capital. To maintain the integrity of the capital base, many jurisdictions require creation of a capital redemption reserve equal to the nominal value of the shares redeemed. The reserve fills the gap left by the reduction, preventing a net decrease in the company's total statutory capital. This reserve, like other capital reserves, cannot be distributed as a dividend.
Reserve capital is uncalled share capital that a company designates as callable only during a winding-up. It never appears on the balance sheet as an asset or liability. Capital reserve is an actual credit balance in the equity section of the balance sheet. The two terms are frequently confused but represent entirely different concepts. Reserve capital is a legal designation; capital reserve is an accounting entry.
Sources:
https://www.wallstreetmojo.com/reserves-and-surplus/
https://www.jainuniversity.ac.in/blogs/difference-between-capital-reserve-and-revenue-reserve
https://www.accountingcapital.com/basic-accounting/what-are-reserves/
https://www.thebalancemoney.com/capital-surplus-and-reserves-on-the-balance-sheet-357270