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Confused about employee stock options: How do I afford these?
Stock options represent an option to buy a share at a given price.  What you have been offered is the option to buy the company share at a given price ($5) starting a given date (your golden handcuffs aka vesting schedule). If the company's value doubles in 1 year and the shares are liquid (i.e. you can sell them) then you've just made $125k of profit.  If the company's value has gone to zero in 1 year then you've lost nothing other than your hopes of getting rich. As others have mentioned, the mechanics of exercising the option and selling the shares can typically be accomplished without any cash involved.  The broker will do both in a single transaction and use the proceeds of the sale to pay the cost of buying the shares.  You should always at least cover the taxable portion of the transaction and typically the broker will withhold that tax anyways.  Otherwise you could find yourself in a position where you have actually lost money due to tax being owed while the shares decline in value below that tax.  You don't have to worry about that right now. Again as people have mentioned options will typically expire 10 years from vesting or 90 days from leaving your employment with the company.  I'm sure there are some variations on the theme.  Make sure you ask and all this should be part of some written contract.  I'm sure you can ask to see it if you wish.  Also typical is that stock option grants have to be approved by the board which is normally a technicality. Some general advice: