Rate Lock vs. Fixed-Rate Mortgage: What Every Buyer Needs to Know
They sound the same — but confusing the two can cost you before you ever get to closing.
"If my mortgage is a fixed rate — why do I need to lock in my rate before closing?"
It's one of the most common questions I hear from buyers. These two terms sound identical, but they apply at two very different stages of the home buying process — and understanding the difference can save you real money.
Rate Lock: Protection Before Closing
Mortgage interest rates move daily — sometimes multiple times a day. A rate lock is your lender's promise to hold a specific interest rate for a set period (usually 30–60 days) while your loan moves toward closing.
- Lender offers 6.25% today — you lock it
- Rates rise to 6.75% during your lock period
- Your rate stays protected at 6.25%
A fixed-rate mortgage means your principal and interest payment stays the same for the entire life of the loan — 15 or 30 years. Rates can rise or fall in the market, but yours doesn't budge.
- Rates climb to 8% — yours stays 6.25%
- Rates drop to 5% — yours stays 6.25%
- Your payment never changes
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