Definition
A rate lock is a guarantee from a lender that your mortgage interest rate will not change between the time of your application and closing. This protects you if market rates rise.
Understanding the Rate Lock
A rate lock appears during the mortgage application process, often after your loan is approved. It helps protect you against rising interest rates for a set period. In simple terms, if rates go up after you lock, your rate stays the same. Example: If you lock a 6% rate and rates rise to 6.5%, you still get 6%. However, if rates drop, you're still locked at the original rate unless you can renegotiate. It's not a guarantee of loan approval or an assurance of the lowest possible rate.

