Rate Lock vs. Float: When to Lock In Your Mortgage Rate

Once your mortgage application is submitted, you face a decision that can quietly cost or save you thousands of dollars: should you lock your rate now, or let it float in hopes of a better one?

A rate lock guarantees your quoted rate for a set period — typically 30, 45, or 60 days — regardless of what happens in the market. If rates rise during that window, you’re protected. If rates fall, you’re stuck with your locked rate unless your lender offers a float-down option.

Floating means you don’t lock and your final rate is set closer to closing. If rates drop, you benefit. If they rise, your payment rises with them.

Locking tends to make sense when:

• Rates are trending upward
• You’re close to closing and don’t want to risk volatility
• The current rate already supports the payment you’re comfortable with

Floating tends to make sense when:

• Rates are clearly trending downward
• You have a longer closing timeline and time on your side
• You can afford a slightly higher payment if rates rise against you

A common middle path is a float-down option — for a fee, your lender allows one rate reset if rates drop before closing. It costs more upfront but gives you the security of a lock with some of the upside of a float. Most borrowers benefit more from locking early than from trying to time the market. Predictability has real value when you’re making one of the largest financial decisions of your life.ath to ownership rather than holding out for perfect conditions that may never arrive.