that if I make the payment on my Car loan as soon as it's posted that I will pay less interest than if I wait until a couple days before it's due. I was looking over my loan and payments (I make a double payment each month) my payment is $553 plus I put another $500 towards the principal, and I saw interest was different each month normally going down each month but a couple months were more than the previous month and it all added up to how soon I made the payment, it can make almost a $100 difference towards the principal (now I feel like a dumbass, lol) so I guess it can depend on your type of loan but now I know.....