You may need to specifically tell them that you want the extra to go toward the principal. I once had a loan where any extra payment would simply be applied to next month's payment.
Another possibility is to use that money to pay off a smaller bill (if you have one that's less than $1000) and then take that money every month and apply it to your car loan.
Absolutely.
YOu're going to need to check with your specific lender.
Would putting this $ towards the car decrease the amount of time I have left or just the amount that goes toward principle each month???
That's sort of the same thing. If the 1k goes to principal, it will take down the principle by 1K, one time. You will still owe your monthly payment for the month you send in your payment.
Or you could send in the 1K, have some take care of the monthly payment which would be split into the normal interest and principal, and the rest will go to principal only.
Both of those will lower the total time it will take you to pay off the car.
Or, and this could be the default mode of your lender (it was for our Chase loan, as an example), it pre-pays future monthly payments. So if your payments are $250, that would pay four months. So you might owe zero for four months, but then you're back to normal. And you wouldn't have gained much of anything, unless you've been careful to keep the money for those monthly payments for the future payments (or for a future principal payment, or just send that money in as well).
The other poster's idea of, if you have a few smaller debts that this could pay off, and if the monthly payments on those debts add up to a good amount, you could pay off those debts with the 1000, then use those monthly debts to put, each month, towards that car loan as extra, to reduce the principal which will reduce the amount of time you have the loan.
Figure out what you *want* to do, call your lender to see what you *can* do, make sure you know of any fees to do what you want to do (with Chase, if I did an extra payment in ONE way, there was a $10 fee...if I did it in *another* way, there was no fee), and do it!
Congrats on putting the windfall towards debt! It's a great decision!