If you're using the Gold Family CDP or Underage Coupon, an underage fee may appear on your reservation, but should be removed by return. If you're unsure, clarify this before you sign the contract and take possession of the vehicle. Try to get it in writing, print out the e-mail, and take it with you to pick up the car. As silly as it sounds, many Hertz reps don't know Hertz policy.