What ESOPs and RSUs actually cost you in tax

"You'll get 1,000 options" sounds like a number. In practice it's a two-stage tax event most people only learn about the first time they actually exercise or vest — usually several years after the offer letter that mentioned it.

Stage one: taxed as salary, at exercise or vesting

When your options are exercised (or your RSUs vest), the difference between the fair market value on that date and what you paid — the "spread" — is added to your income and taxed as a perquisite, at your normal salary tax rate. This happens whether or not you sell anything; simply exercising or vesting triggers it.

Stage two: capital gains, when you sell

Once you actually sell the shares, any further gain or loss from the price on the day you acquired them is taxed separately as a capital gain — short-term or long-term depending on how long you held them, at the usual capital-gains rates for that asset class.

Why "1,000 options" is a much smaller number than it sounds

Options with a strike price close to the current fair market value have almost no spread yet — their value is entirely a bet on future growth. A grant that sounds impressive by headcount can be worth very little today, and a lot in four years, or nothing at all if the company's valuation falls. None of that uncertainty shows up in "1,000 options."

Vesting schedules complicate any quick estimate

Real vesting rarely spreads evenly — a common structure is a one-year cliff (nothing vests until you've stayed a full year) followed by monthly or quarterly vesting after that. A straight-line estimate is a reasonable sense-check for comparing offers, but your actual grant letter is the only accurate source for your specific schedule.

Get a rough annual value estimate on the ESOP/RSU tax calculator, or weigh it against a competing offer directly in the job offer comparison tool.