What does it mean to lock the interest rate?

Mortgage rates can change from the day you pre-qualify for a loan to the day you close the transaction. If interest rates rise sharply during the pre-qualification process it can increase the borrower’s mortgage payment unexpectedly. Therefore, a lender can allow the borrower to "lock-in" the loan’s interest rate guaranteeing that rate for a specified time period, often 30-60 days, sometimes for a fee.


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