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If I put a large down payment (over 50%) towards a car loan, can I reduce my interest rate and is it smart to even put that much down?
I had a strange experience buying a new car.  They were offering a deal of 0.9% interest on the loan but only if the loan was above a certain amount.  Below that amount, the interest rate was something like 3%.  Given the amount I was willing to put down, it was cheaper to put less down and get the lower interest rate.  So, once you agree to the purchase price, you need to discuss what finance options they offer.  You might also check in advance with other loan providers (e.g. your bank) to see what offers they have.