<prompt> Human: When I make my payment online, it gives the option to pay additional principle andor additional interest. I would assume if I want to build equity faster, and pay the loan off sooner, I would pay additional principle. Can someone please explain the benefits of paying additional interest? Im not sure how it works. Will that also help to pay it off sooner?  <response>: Thats a weird choice. Id hve no idea why youd want to prepay interest. Maybe to get a tax deduction in an earlier year?Apply it to the principal. 