If you are an executive or other key employee, you might be compensated with more than just salary, fringe benefits and bonuses: You might also be awarded stock-based compensation, such as restricted stock or stock options. Another form that is becoming more common is restricted stock units (RSUs).
RSUs are contractual rights to receive stock (or its cash value) after the award has vested. Unlike restricted stock, RSUs are not eligible for the Section 83(b) election that can allow ordinary income to be converted into capital gains.
But RSUs do offer a limited ability to defer income taxes: Unlike restricted stock, which becomes taxable immediately upon vesting, RSUs are not taxable until the employee actually receives the stock.
So rather than having the stock delivered immediately upon vesting, you may be able to arrange with your employer to delay delivery. This will defer income tax and may allow you to reduce or avoid exposure to the additional 0.9% Medicare tax (because the RSUs are treated as FICA income). However, any income deferral must satisfy the strict requirements of Internal Revenue Code (IRC) Section 409A.
Source: PDI Global