How much is the tax for a 16-year-old worker?

Note that age of the worker has nothing to do with the tax rate. The key is the amount of money made. The Calculator will help you figure that out. The rule of thumb is to put a "0" exemption on your W-4. That way, if you have several jobs within a year or someone gifts you money, you will have enough money withheld to cover any taxes you may owe. If you work for a restaurant, they may put "8" in the withholding and so you would owe any tax at the end of the year--so be sure that if that is the case that you put some aside from each paycheck for the future tax owed. Also, your parents may claim you as a dependent so that may affect your tax rate.