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Job Offer - Explain Stock Options [US]
Since the 2 existing answers addressed the question as asked. Let me offer a warning. You have 10,000 options at $1. You've worked four years and the options are vested. The stock is worth $101 when you get a job offer (at another company) which you accept. So you put up $10k and buy the shares. At this moment, you put up $10K for stock worth $1.01M, a $1M profit and ordinary income.  You got out of the company just in time. For whatever reason, the stock drops to $21 and at tax time you realize the $1M gain was ordinary income, but now the $800k loss is a capital loss, limited to $3000/yr above capital gains. In other words you have $210k worth of stock but a tax bill on $1M.  This is not a contrived story, but a common one from the dotcon bubble. It's a warning that 'buy and hold' has the potential to blow up in your face, even if the shares you buy retain some value.