ESOP exercise window: How long do you have to act?

Ever wondered how long you have to actually buy your ESOPs after they vest? In most companies, you get a defined exercise window — often 5 to 10 years from the grant date, but as little as 30 to 90 days if you leave the company. Miss it, and your vested options can expire worthless.

This window is one of the most overlooked rules in employee stock plans. Let's walk through how it works, what triggers a shorter clock, and how to plan around it.

What is the ESOP exercise window?

The exercise window is the period during which you can convert your vested stock options into actual shares. Think of it like a coupon with an expiry date. Until you click "exercise" and pay the strike price, you don't own anything. You only hold a promise.

Two clocks usually run in parallel. One is the long window tied to the grant — typically the option's full term, often 10 years. The other is the short window that starts the moment your employment ends. The shorter clock almost always wins.

Typical ESOPs exercise periods you'll see

Companies write their own rules in the ESOP scheme document, but most fall into a few patterns. Here are the common ones you should recognise.

• While employed: 5 to 10 years from grant, or sometimes from vesting.
• Voluntary resignation: 30, 60, or 90 days from your last working day.
• Termination for cause: Often zero days. All vested and unvested options lapse.
• Retirement: Sometimes a longer window, like 1 to 3 years.
• Death or permanent disability: Usually 6 to 12 months for the legal heir.
• Company sale or IPO: Special acceleration rules may apply.

The number that matters most is the post-exit window. If you ever plan to leave, that short clock decides whether your years of vesting turn into real money or vanish.

Why companies set such short post-exit windows

The standard 90-day post-termination window came from old US tax rules tied to incentive stock options. Many Indian and global startups simply copied it. The logic is that options are meant to retain employees, not reward people who have already left.

But there's a real problem. In a private company, you may have to pay a large strike price plus tax — in cash — within 90 days, with no easy way to sell shares. Some modern employers now offer extended windows of 5, 7, or even 10 years post-exit. Always read your scheme before you sign.

Example: Priya joined a startup in 2021 with 4,000 options vesting over 4 years. She resigned in 2025 with 3,000 vested options at a 50 rupees strike price. Her scheme gave her 90 days to exercise. That meant arranging 1,50,000 rupees in cash plus perquisite tax — within three months — for shares she could not yet sell. She managed it, but only just.

How taxes squeeze the ESOPs window even more

In India, exercising options is a taxable event. The difference between the fair market value on the exercise date and your strike price is treated as a perquisite. Your employer deducts TDS at your slab rate — even if you cannot sell the shares.

So your real cost on exercise day is:

1. The strike price you pay the company.
2. The perquisite tax on the paper gain.
3. Future capital gains tax when you finally sell.

Eligible startups recognised by DPIIT can defer the perquisite tax for up to 5 years, until sale, or until you leave — whichever is earliest. You can read the official rules on the Income Tax India portal. For listed-company schemes, SEBI's framework is published on sebi.gov.in.

How to plan before your exercise window closes

You don't want to make a 10-lakh-rupee decision in a panicked weekend. Build a simple plan well before any deadline.

• Read your grant letter and scheme: Note the exact post-exit window in days.
• Track vesting dates: Keep a spreadsheet with grant date, vesting schedule, and strike price.
• Estimate the cash needed: Strike price plus expected perquisite tax at your slab.
• Check liquidity options: Buybacks, secondary sales, or tender offers from the company.
• Talk to a CA: Especially if you hold options across multiple grants or countries.
• Decide early: Exercise gradually if allowed, instead of one rushed lump sum.

If your company is private and there's no clear exit, sometimes the smartest move is to exercise only what you can afford to lose. Options are not free — they cost real money once you act.

Frequently asked questions

Do unvested ESOPs also have an exercise window?

No. You can only exercise options that have already vested. Unvested options usually lapse the day you leave the company, regardless of any window.

Can I extend my exercise window after resignation?

Only if your employer agrees. Some companies amend schemes to give departing employees a longer runway, but it is rare and usually case-by-case.

What happens if my exercise window closes during a market crash?

For listed companies, the window does not pause. If options expire while the share price is below your strike, they end up worthless even though you waited.