If you sign loan docs for a fixed loan the interest rate should not change during the loan term. However, if you sign into a variable rate loan, the interest rate can change depending on market conditions. Alternatively, if you are offered a low APR loan but do not accept the offer, the APR or interest rate may change. If you are offered a low APR loan you should commit quickly, but not too quickly. Make sure you take the time you need to budget the monthly payment and verify that you do need to borrow the money.