Share-based compensation incentives are commonly used by corporations worldwide.  Employees defer income or realize income immediately at a low value, and the employer accepts a deferred or reduced deduction for compensation expense.  Three or four key moments in the life of a stock-based compensation plan can be identified as taxable events: (i) the grant of share-based compensation, (ii) the exercise of an option, (iii) the “vesting” of the underlying shares, and (iv) their subsequent sale.  Fanny Karaman and Stanley C. Ruchelman explore tax treatment in France and the U.S. in the context of a French employee who participates in a French plan and is then assigned to the U.S.