Should You Lock Your Mortgage Rate Now, or Wait?
Lock your rate now if you already have a signed purchase contract and think rates are more likely to rise than fall before you close; wait and keep floating if closing is still weeks or months away or you expect rates to fall further, since floating lets you benefit from a lower rate while locking protects you from an increase, and the right choice ultimately depends on your closing timeline and how much risk you want to carry.
Last updated July 22, 2026What does locking a mortgage rate actually do?
A rate lock is a lender's promise to hold a specific interest rate for a set number of days while your loan moves through underwriting. Locking protects you if rates rise before closing, but it also means you will not automatically get a lower rate if rates drop afterward, unless your lender offers a float-down option. Floating means you are still watching the market and have not committed yet, which carries the opposite tradeoff. Deciding between the two is really a bet on which direction rates are likely to move before your closing date, so there is no universal answer that fits every borrower.
Can I lock a rate before I'm under contract on a home?
For a standard rate lock, most lenders require a signed purchase contract first, since the lock is tied to a specific property, loan amount, and closing date. Before that point, any rate you are quoted is a floating estimate rather than a locked commitment. That said, this is common lender practice rather than a universal rule: some lenders offer "lock and shop" style programs that let a borrower lock a rate for roughly 60 to 120 or more days before a contract is signed, while they continue house hunting, often for an added fee.
How long do rate locks and pre-approvals stay valid?
These are two different clocks, and it helps to know both before you start comparing offers.
| Item | Typical validity |
|---|---|
| Pre-approval letter | About 60 to 90 days for most lenders; some extend closer to 120 days |
| Standard rate lock | 30 days is the most common default |
| Shorter rate lock | 15 days (sometimes 7), usually available at a lower cost |
| Extended rate lock | 45 to 60+ days, usually costs more |
| Lock-and-shop program | Roughly 60 to 120+ days, available before a signed contract |
A pre-approval letter is a broader estimate of what you can likely borrow, based on your income, assets, and credit at the time it was issued. A locked rate is a narrower, time-limited commitment on the actual interest rate for a specific loan, which is why it expires much sooner. As your closing date approaches, a lender will typically refresh (not fully re-pull) your credit to check for new debt, rather than repeatedly pulling a full credit report throughout the process.
It depends on your situation
- A meaningful rate reduction is available right now and there is no strong reason to expect further drops. Locking in the improvement can make sense, since you capture the benefit today and can still look into refinancing again later if rates fall further.
- Closing is still weeks or months away and there is no urgency to lock. Floating a little longer, then locking closer to closing, can let you take advantage of a shorter, cheaper lock window and any further rate movement in your favor.
- You are still house hunting and have not signed a contract yet. A standard lock is not available yet; ask whether your lender offers a lock-and-shop option if you want price certainty before you have an accepted offer.
- Rates appear to be trending upward and your closing date is approaching. Locking sooner protects you from further increases, since a locked rate has a firm expiration date and cannot be extended indefinitely without a cost.
Related questions
- what determines your mortgage rate quote
- how does the loan term (10, 15, 20, or 30 years) change my rate and payment
- how does loan-to-value affect the mortgage rate I'm offered
- how Do Fed Policy, the 10-Year Treasury, and Daily Market Moves Affect Mortgage Rates
- HELOC vs home equity loan vs cash-out refinance
Sources
- https://www.consumerfinance.gov/ask-cfpb/whats-a-lock-in-or-a-rate-lock-en-143
- https://www.mortgageresearch.com/articles/locking-in-a-mortgage-rate-before-finding-a-house-lock-and-shop
- https://www.debt.com/news/when-lock-in-mortgage-rate
- https://mymortgageinsider.com/when-should-i-lock-in-my-mortgage
- https://www.nerdwallet.com/mortgages/learn/what-is-mortgage-rate-lock
- https://www.experian.com/blogs/ask-experian/how-long-does-a-mortgage-preapproval-last
- https://www.zillow.com/learn/how-long-is-mortgage-preapproval-good-for
- https://guide.freddiemac.com/app/servicing/section/5604.3
- https://www.lower.com/mortgages/how-long-can-you-lock-a-mortgage-rate
- https://www.newcastle.loans/mortgage-guide/interest-rate-lock
- https://loanpronto.com/blog/second-credit-check-before-closing
- https://www.sirva.com/learning-center/blog/2025/02/12/how-often-will-a-full-credit-report-be-pulled-during-the-mortgage-approval-process-
- https://singlefamily.fanniemae.com/applications-technology/desktop-underwriter-desktop-originator/undisclosed-liabilities
Educational information only, not individualized financial or legal advice. Program details and rates change; verify current terms with a licensed loan officer before making a decision.