Vesting _options_ aren't taxed until you exercise them. When you exercise them, the company's most recent valuation will include a value for the common stock y

Vesting _options_ aren't taxed until you exercise them. When you exercise them, the company's most recent valuation will include a value for the common stock you purchased, and you can get hit by AMT on the value increase from the strike price to the current value. Note: I am not a tax expert and my memory is imperfect.