What is a mortgage rate lock?
A mortgage rate lock is a lender’s commitment to hold your quoted interest rate, points and lender credits for a set number of days while your loan is processed, most commonly 30 to 60 days. It is not a handshake. Under 12 CFR 1026.37(a)(13), page 1 of your Loan Estimate must carry a statement labeled “Rate Lock” saying whether the rate is locked and, if it is, the exact date and time, including the time zone, when that period ends.
If market pricing rises while you are locked, you keep your rate. If it falls, you generally do not benefit, because the lock binds both sides. If the lock runs out before you close, the protection stops.
Learn what a mortgage rate lock covers, how long lock periods run, and what expiration means. For the wider picture of what moves pricing, see our guide to mortgage rates and the market.
Key takeaways:
- A lock freezes the rate, not the whole loan: Standard lock periods run 30 to 60 days, with 90- and 120-day locks for extended timelines, and the lock holds your rate, points and lender credits, not your closing costs and not your approval.
- The lock has to be put in writing fast: When the rate is locked after your first Loan Estimate goes out, federal law gives the lender 3 business days from the lock date to reissue that Loan Estimate with the locked rate and points.
- Expiration is a pricing event, not a paperwork event: Match the lock period to a realistic closing date with at least 7 days of buffer, because once a lock expires you either pay to extend it or re-price at the current market.
What is a mortgage rate lock?
A mortgage rate lock is a lender’s binding commitment to hold a specific interest rate, and the points and lender credits quoted with it, for a defined number of days, so market movement before closing does not change your price. Three things sit inside that commitment.
- The note rate: The rate written on your promissory note, and the number that drives your amortization schedule. This is what the lock protects.
- Points and lender credits: Rate and price are one package. A rate quoted with 0.5 points is a different commitment than the same rate with 1.5 points, which is why disclosure rules tie them together.
- The lock period: A count of days ending at a specific date and time. Nothing survives that timestamp.
What a lock does not do matters just as much. It does not freeze your mortgage closing costs, your property taxes or your escrow deposit. It does not guarantee approval: you still have to qualify and the property must appraise. And it does not lock your annual percentage rate (APR), a calculated figure that moves whenever the fees behind it move. The CFPB explains the difference between the interest rate and APR.
How does a mortgage rate lock work?
A lock is a scheduling decision layered on a disclosure timeline federal law already fixes, and the two only work if the dates line up.
- Loan Estimate within 3 business days of application: Under 12 CFR 1026.19(e)(1)(iii), the lender must deliver it no later than three business days after receiving your application. An unlocked Loan Estimate here is normal.
- You pick a lock period and the lender confirms it: The lock begins when the lender commits, not when you ask, and pricing is captured then.
- A revised Loan Estimate within 3 business days of the lock: 12 CFR 1026.19(e)(3)(iv)(D) requires one no later than three business days after the rate is locked, showing the revised rate, points, lender credits and any other interest-rate-dependent charges. If you locked and nothing arrived, ask.
- Closing Disclosure 3 business days before closing: Under 12 CFR 1026.19(f)(1)(ii)(A), you must receive it no later than three business days before consummation. That waiting period sits inside your lock window, so a lock expiring the day you sign is too short.
Why does a longer lock cost more? The lender carries market risk for the whole period and hedges it, and hedging 60 days costs more than hedging 30. That cost lands in your pricing. The movement itself comes from bond market demand rather than any single policy announcement, which our explainer on the Federal Reserve and mortgage rates unpacks. Freddie Mac’s weekly average mortgage rates publish each Thursday at noon Eastern, moving to Wednesday when a holiday falls on the Thursday.
How long does a mortgage rate lock last?
30 and 60 days are the standard menu, and every step up the ladder prices higher. Lock periods are lender terms, not agency rules and not Fannie Mae or Freddie Mac requirements, so the table describes the market’s shape, not a published rule.
| Lock period | Typical use case | Relative pricing effect |
|---|---|---|
| 15 days | A file already cleared to close, or a short refinance re-price | Best pricing on the standard menu |
| 30 days | A purchase on a tight timeline; simple refinances | The baseline other periods price against |
| 45 days | The realistic default on a purchase with an appraisal | Slightly above the 30-day price |
| 60 days | Long contracts, occupancy delays, self-employed income | Measurably above the 30-day price |
| 90 days | New construction nearing completion | A meaningful add; often quoted only on request |
| 120 days and longer | New construction and extended-close scenarios | The most expensive option; availability varies by lender |
Build the period around your purchase agreement’s closing date, then add a buffer of at least a week. A 30-day lock on a 30-day contract leaves no room for a late appraisal or a condition that takes five extra days, the two most common reasons files drift. Our walkthrough of the mortgage loan process shows where slack disappears.
What does rate lock expiration mean?
Expiration means the price protection ends at the timestamp printed on your Loan Estimate and the loan reverts to current market pricing. It does not mean your loan is denied. Two paths open, both lender terms.
- Extend the existing lock: Lenders in Align’s network typically price extensions as a fraction of a point, commonly 0.125% to 0.50% of the loan amount depending on the days you need.1 Most would rather extend than lose the loan.
- Re-lock at current pricing: Many lock policies apply a worst-case rule, meaning you get the worse of your original locked price or today’s market price. That asymmetry stops an expired lock from becoming a free option on falling rates, and it bites hardest when pricing has climbed, the same squeeze covered in refinancing in a rising rate environment.
The exposure is what makes a buffer worth planning. On a $320,000 30-year fixed loan, a 0.25% difference in rate is roughly $50 a month and close to $18,000 over the full term.2 An extension fee is almost always smaller. For the cost comparison of extending, floating down or riding it out, see the benefits of mortgage rate locks.
What can void a rate lock before it expires?
A lock is tied to the file the lender priced, so changing the file can undo it. Regulation Z lists six categories permitting a revised Loan Estimate at 12 CFR 1026.19(e)(3)(iv), and lender lock policies key off the same facts. The practical triggers are a change in loan amount, a switch in program or term, a change in occupancy or property type, an appraisal that lands differently than assumed, or a change in credit or income before closing.
Where your rate lock appears on the Loan Estimate
Page 1, in a box labeled “Rate Lock,” carrying the date, time and time zone required by 12 CFR 1026.37(a)(13). The CFPB’s walkthrough of where your rate lock appears on the Loan Estimate shows it in context.
One distinction trips people up: the Loan Estimate has its own expiration, unrelated to your rate lock. Under 12 CFR 1026.19(e)(3)(iv)(E), if you indicate an intent to proceed more than 10 business days after the Loan Estimate was provided, the lender may revise the closing cost estimates. Ten business days is the floor, not a fixed rule: the same provision lets a lender specify a longer period before its offer expires, so read the expiration date printed on your own Loan Estimate rather than counting to 10. That clock governs costs; the Rate Lock box governs the rate. Two deadlines, same page, and only one protects your rate.
Rate lock vs. buydown vs. float-down: what each tool does
These three get used interchangeably and solve different problems.
- Rate lock: Holds the rate you already have for a set number of days. It changes nothing about the rate; it only stops it from moving.
- Rate buydown: Pays money up front, in points or through a seller or builder contribution, for a lower rate permanently or for the first years. Our guide to mortgage rate buydowns covers permanent versus temporary structures and who may fund each.
- Float-down: A lender-priced option to re-price once if the market improves by a defined amount before closing. Not standard, not free, terms differ sharply by lender.
Choosing among them is a timing question more than a math question. Our rate strategy hub collects the frameworks.
How Align times your lock
Locking is a timing decision. Samantha's loans averaged under 14 days from application to clear to close over the last 12 months, across more than 100 loans, so your lock can match the time you actually need.
In late 2022, Freddie Mac found borrowers who got two quotes could have saved as much as $600 a year, and four or more quotes more than $1,200 a year.
Already have an offer from one of the big national lenders you see advertised? Bring us the Loan Estimate. We will compare it line by line and show you where we can do better.
Sources: Align Lending loan records, 12 months to October 2026; Freddie Mac, When rates are higher, borrowers who shop around save (February 2023).
FAQ: Mortgage rate locks
Here are answers to common questions about mortgage rate locks.
When should I lock my mortgage rate?
Most borrowers lock once they have an accepted purchase agreement and a realistic closing date, the first moment the lock period can be matched to the timeline. Locking earlier costs more, because longer locks price higher. If pricing is volatile or drifting upward, locking sooner protects your qualification; if you have flexibility and pricing is easing, floating a few days can pay off. The trade-offs are laid out in the benefits of mortgage rate locks.
What happens if my rate lock expires before closing?
You either pay an extension fee, commonly 0.125% to 0.50% of the loan amount at lenders in our network, or you re-lock at current market pricing, which can be higher. Most lenders will extend rather than let a deal die. To avoid it, choose a lock period with a buffer of at least a week past the contract closing date and return underwriting conditions the day they are requested. Our walkthrough of the mortgage loan process shows where files slip.
Can I get a lower rate if rates drop after I lock?
Only with a float-down option, which some lenders offer for a fee or build into pricing. A typical float-down requires the market to improve by a minimum amount before you can exercise it, and it can generally be used once. Without one, the locked rate stands. If pricing falls sharply, some borrowers restart with a different lender, though that resets the timeline and the disclosures. What moves pricing is covered in the Federal Reserve and mortgage rates.
Does a rate lock cost money?
Sometimes directly, and almost always indirectly. Many lenders advertise free locks but price the longer period into the rate itself, so a 60-day lock quotes above a 30-day lock on the same file. Extensions and float-downs typically carry explicit fees. Compare Loan Estimates carrying the same lock period, otherwise you are comparing rates that carry different risk, and check the annual percentage rate (APR) alongside the note rate.
The bottom line on mortgage rate locks
A mortgage rate lock is a lender’s commitment to hold your interest rate, points and lender credits for a set number of days, most commonly 30 to 60, with 90- and 120-day options for extended timelines. It protects the rate and nothing else: not your closing costs, not your approval, not your APR. Federal law puts the terms in writing, since 12 CFR 1026.37(a)(13) requires the Rate Lock box on page 1 of your Loan Estimate to state the date, time and time zone the lock ends. Match the period to a realistic closing date with a week of buffer, and confirm what an extension costs before you need one.
If you’re ready to line up a lock period against a real closing date, talk to Align Lending, we’ll shop your scenario across our lender network and show you the lock terms side by side. Call 248-506-5727 or start online today.
Footnotes:
1. Lock periods, extension fees, float-down options and worst-case re-lock rules are terms set by individual lenders, not by any government agency and not by Fannie Mae or Freddie Mac. The ranges shown reflect what Align Lending observes across the wholesale lenders in its network and are offered as general orientation, not as a quote. Terms vary by lender, by loan program and by market conditions, and the terms that apply to you are the ones in your own lock agreement and Loan Estimate. Return to text.
2. Example figures are hypothetical and for educational purposes only; they do not constitute an advertisement of credit terms or a rate quote under federal or state lending laws. The $50-per-month and roughly $18,000 lifetime figures illustrate the effect of a 0.25% difference in interest rate on a $320,000 30-year fixed-rate loan, principal and interest only, and the exact amounts change with the loan amount, the term and the rate level at which the comparison is drawn. Your rate and terms will depend on your application, your property and market conditions. Return to text.
Sources: Requirement that page 1 of the Loan Estimate carry a statement labeled “Rate Lock” disclosing whether the interest rate is locked for a specific period and, if so, the date and time including the applicable time zone when that period ends, together with the statement that the interest rate, any points and any lender credits may change unless the rate is locked and the date and time at which estimated closing costs expire, 12 CFR 1026.37(a)(13). Delivery of the Loan Estimate no later than three business days after the creditor receives the consumer’s application, 12 CFR 1026.19(e)(1)(iii). Requirement that, no later than three business days after the date the interest rate is locked, the creditor provide a revised Loan Estimate showing the revised interest rate, the points disclosed under 12 CFR 1026.37(f)(1), lender credits and any other interest-rate-dependent charges and terms, 12 CFR 1026.19(e)(3)(iv)(D). The six categories permitting revised estimates, changed circumstance affecting settlement charges, changed circumstance affecting eligibility, revisions requested by the consumer, interest rate dependent charges, expiration, and delayed settlement date on a construction loan, 12 CFR 1026.19(e)(3)(iv)(A) through (F). The expiration provision, under which the consumer indicates an intent to proceed more than 10 business days, or more than any additional number of days specified by the creditor before the offer expires, after the Loan Estimate was provided, 12 CFR 1026.19(e)(3)(iv)(E). Requirement that the consumer receive the Closing Disclosure no later than three business days before consummation, 12 CFR 1026.19(f)(1)(ii)(A). Definitions of the mortgage interest rate and the annual percentage rate, Consumer Financial Protection Bureau, Ask CFPB. Description of the Loan Estimate and its rate lock section, Consumer Financial Protection Bureau, Owning a Home. Publication of the Primary Mortgage Market Survey each Thursday at noon Eastern, moving to Wednesday when a holiday falls on the Thursday, Freddie Mac Primary Mortgage Market Survey. Lock period, extension and float-down pricing described in this article is lender-set and is attributed to lenders in Align Lending’s wholesale network; no agency, Fannie Mae or Freddie Mac instrument establishes those terms.
This article is for informational purposes only and is not intended to provide legal, financial, or tax advice. Rate lock terms, extension pricing and float-down availability are set by individual lenders and change frequently; confirm the terms that apply to your loan with your lender and review your own Loan Estimate and lock agreement. Figures shown are illustrative, are not a rate quote or an offer of credit, and are subject to change. Align Lending is an independent Michigan mortgage broker, NMLS #2041154.
Related resources
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Guide to mortgage rate buydowns: How they lower your payment
Learn how temporary 2-1 buydowns and permanent discount points cut your mortgage payment, what each costs, and how to calculate your break-even point.
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Benefits of mortgage rate locks, and when to lock
See how a mortgage rate lock protects your rate for 30 to 60 days, what extensions cost, and when locking beats floating in a shifting rate market.
