ESOP Letters in India: Vesting, Cliff, Exercise Window and Tax

What an option actually is

An employee stock option is a right to buy a specified number of shares at a specified price after a specified period. It is not a shareholding. Until you exercise, you have no shares, no voting rights and nothing to sell.

This distinction drives everything else. Because exercise requires you to pay the exercise price, an option only becomes valuable when the share is worth more than that price and you have both the money and the opportunity to exercise. Each of those three conditions is a place where an ESOP can quietly fail to deliver.

Vesting, cliff and the grant letter

Vesting is usually over three to four years with a one-year cliff, matching international practice. Options vest, then sit exercisable, then either get exercised or lapse.

The grant letter is the operative document and it is worth reading properly rather than filing. It should state the number of options, the exercise price, the vesting schedule, the exercise window during employment and after departure, what happens on a change of control, and whether the company has any right to buy back shares acquired on exercise. If it does not address the post-departure window, that is the first question to ask.

The exercise window is the term that matters most

Many Indian ESOP schemes give departing employees a short period, sometimes thirty or ninety days, to exercise vested options or lose them. That sounds administrative and is in fact decisive.

Consider what exercising requires in an unlisted company. You pay the exercise price in cash, you incur tax on exercise, and you receive shares you cannot sell because there is no market for them. An employee leaving a startup is being asked to spend real money and incur a real tax liability to acquire an illiquid asset, within ninety days. A great many people simply cannot, and vested options lapse. Longer windows, or windows that run until a liquidity event, are far more meaningful and are worth asking about before you join.

How they are taxed, in outline

Indian ESOPs are generally taxed at two points. At exercise, the difference between the fair market value of the share and the exercise price is treated as a perquisite and taxed as salary income, with the employer ordinarily deducting tax. At sale, the gain over the value already taxed at exercise is taxed as capital gains, with the treatment depending on the holding period and the nature of the shares.

A deferral of the tax payable at exercise is available to employees of eligible startups, subject to conditions, which addresses the cash-flow problem of paying tax on an illiquid share. Whether your employer qualifies and whether you qualify are specific questions.

A caution on section numbers

The Income-tax Act, 2025 came into force on 1 April 2026 and replaced the 1961 Act, renumbering provisions throughout. Older articles, scheme documents and internal FAQs cite sections of the 1961 Act, and those references are now to a repealed statute even where the substance carries over.

For that reason this article describes the shape of the treatment rather than quoting section numbers. If your ESOP documentation cites specific provisions, check them against the current Act with a tax advisor rather than assuming a renumbering was harmless.

Questions to ask before you accept

• What is the exercise window after I leave, and does it differ for good and bad leavers?
• What is the exercise price, and how was fair market value determined?
• What percentage of the fully diluted cap table does my grant represent, not just the number of options?
• What happens to vested and unvested options on a change of control?
• Does the company have a buy-back right over shares I acquire on exercise, and at what price?
• Is the company an eligible startup for the tax deferral, and does that apply to me?