A mortgage rate lock is a lender’s commitment to hold your interest rate through a stated expiration date, provided you close within that period and your application does not change in a way that affects pricing. It can protect you from a rate increase while you prepare to close, but it may also leave you unable to benefit automatically if rates fall. The decision depends on your closing timeline, the lender’s written terms and your comfort with rate risk—not a reliably predictable “best day” to lock.
This guide covers U.S. homebuyer guidance from the Consumer Financial Protection Bureau (CFPB; guidance last reviewed May 2, 2023) and Freddie Mac. Lock periods, prices, extension rules and float-down features vary by lender, so use your own Loan Estimate and lock agreement for the terms that apply to your loan.
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What a mortgage rate lock does—and what it does not do
A rate lock protects the quoted interest rate for a defined period. The CFPB describes a lock as keeping the rate from changing between the offer and closing if you close within the specified time and there are no application changes that affect the loan’s pricing. In practical terms, it limits one source of uncertainty while your purchase moves toward closing.
A lock is not an unconditional promise that every detail of your loan will remain unchanged. It is tied to its term, expiration and the assumptions in your application. The CFPB identifies changes to loan type, loan amount, down payment, appraisal outcome, credit score, or the ability to document overtime, bonus or other income as possible reasons the rate could change. Your lender’s written agreement determines which conditions apply to your specific lock.
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Nor does a lock automatically ensure the lowest rate available by closing. If market rates fall after you lock, the locked rate generally does not fall with them unless the lender offers a float-down feature and you meet its terms. Locking therefore exchanges some ability to benefit from a decline for protection against an increase during the lock period.
Look on page 1 of the Loan Estimate for whether the rate is locked and, if so, the date through which it applies. If it is not locked, the rate can change. The Loan Estimate is an important checkpoint, but it may not tell you the cost of extending a lock or show the comparative price of every available lock duration; ask the lender for those details directly.
How to decide whether to lock or float
“Float” means proceeding without locking the rate for now, leaving it exposed to market changes until you lock or close. It is not a forecast that rates will move in your favor. Freddie Mac frames the decision around current market conditions, how close you are to closing and how comfortable you are with risk. Neither that guidance nor the CFPB’s explains a dependable way to predict future mortgage rates or identify a universally best lock date.
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- SPEAKS YOUR LANGUAGE: Keys clearly labeled in residential mortgage finance terms like Loan Amt, Int, Term, Pmt; this industry-standard calculator is super easy to use on all realty financing matters from finding a loan that works for your client to considering trust deeds investments, or finding remaining balances or balloon payments and more
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- DEDICATED BUYER QUALIFYING KEYS: Enter client's income, debt and expenses to pre-qualify them to only show properties they can afford. Include tax, insurance and mortgage insurance then compare loan options and payment solutions to give your client choices before they make an offer to buy
- FIGURE OUT THE RIGHT LOAN: For your client at the press of a button for jumbo, conventional, FHA/VA, or even 80:10:10 or 80:15:5 combo loans; check to see if ARMs or bi-weekly loans, quarterly payments or if interest-only payments are the answer; giving your client more choices; easily perform what if loan or TVM calculations find loan amount, term, interest or PITI or PI payments
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Questions to answer before choosing
- Is today’s rate acceptable? Consider whether the current quoted rate and associated points or lender credits work for your budget. A lock is meaningful only in relation to the actual offer and loan scenario you have.
- Will the lock cover the expected closing? Estimate the time remaining to close and compare it with the proposed expiration date. A lock that expires too soon can leave you exposed to repricing or an extension decision.
- What does the lender charge for the term? Ask whether the initial lock has a fee and how the price changes for a shorter or longer period. Longer locks may cost more, but the amount and available terms are lender-specific.
- Could you absorb a higher rate if you wait? If an increase would make the payment or loan terms unacceptable, the possibility of a decline may not be worth leaving the rate exposed. If you can tolerate the uncertainty, floating may preserve the possibility—without assurance—of locking later at a lower rate.
- How likely is the timeline to change? Consider your transaction’s expected schedule and any known complications, then ask what happens if closing misses the expiration. Do not assume a delay will be treated differently because it is outside your control.
These questions make the decision about risk tolerance and contract terms rather than a guess at the next market move. If the lender can provide alternatives, compare the current lock with the cost and expiration of other durations before deciding.
How long a rate lock lasts
Consumer guidance describes common lock periods, not a guarantee that every lender offers every duration. The CFPB says locks are commonly available for 30, 45 or 60 days, sometimes longer. Freddie Mac lists 30, 45, 60 and 90 days in its consumer guidance and says 30 or 45 days are most common. The right available period and its price depend on the lender and offer.
| Duration described in consumer guidance | What the sources say | What to confirm with your lender |
|---|---|---|
| 30 days | Included in the CFPB’s commonly available periods and Freddie Mac’s list; Freddie Mac says 30 or 45 days are most common. | Whether it covers your expected closing date and how its pricing compares with other terms. |
| 45 days | Included in both sources’ descriptions; Freddie Mac says 30 or 45 days are most common. | The exact expiration date and whether the extra time changes the rate, points, credits or fee. |
| 60 days | Included in both sources’ descriptions of available periods. | Whether this term is offered for your loan and what it costs relative to a shorter lock. |
| 90 days | Listed in Freddie Mac’s consumer guidance; the CFPB says some locks may be longer than 60 days. | Whether it is available and how the lender prices it. Do not infer that every lender offers it. |
Freddie Mac does not state a publication date for the consumer page cited here, and its descriptions should be treated as general guidance rather than current availability at a particular lender. The CFPB page was last reviewed May 2, 2023. For an actual offer, rely on the lender’s present written terms rather than these typical ranges.
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- SPEAKS YOUR LANGUAGE: Keys clearly labeled in residential mortgage finance terms like Loan AMT, Int, Term, PMT. This industry-standard calculator is super easy to use on all realty financing matters from finding a loan that works for your client to considering trust deeds investments, or finding remaining balances or balloon payments and much more
- CONFIDENTLY AND EASILY SOLVES: All your clients' financial questions whether they are buyers, sellers, investors or renters. Increase your perceived professionalism as a new agent, experienced broker or seasoned loan officer. Close more home sales and impress your clients with fast, accurate answers to all their real estate finance questions
- DEDICATED BUYER QUALIFYING KEYS: Enter client's income, debt and expenses to pre-qualify them to only show properties they can afford. Include tax, insurance and mortgage insurance then compare loan options and payment solutions to give your client choices before they make an offer to buy
- FIGURE OUT THE RIGHT LOAN: At the press of a button for jumbo, conventional, FHA/VA, or even 80:10:10 or 80:15:5 combo loans; check to see if ARMs or bi-weekly loans, quarterly payments or if interest-only payments are the answer; giving your client more choices; easily perform what if loan or tvm calculations Find loan amount, term, interest or PITI or PI payments
- BECOME AN INVALUABLE RESOURCE: Reduce your clients' confusion and uncertainty; ensuring they are able to make a purchase offer; knowing they can afford the down payment; and determining which is the right loan for them. Date-math for listings and contracts too. Comes with a protective slide cover, quick reference guide, pocket User's Guide, and long-life batteries
What can change after you lock
A lock is conditional on the loan scenario and application details described in its agreement. The CFPB names several changes that may affect pricing: loan type, loan amount, down payment, appraisal outcome, credit score, and whether overtime, bonus or other income can be documented. These are examples, not a universal list of automatic repricing triggers.
Before signing, ask the lender to identify the specific changes that would alter your rate or other pricing under your agreement. If a relevant detail changes, tell the lender promptly and ask how it affects the lock; do not assume that the original quote still applies unchanged. Keep the answer with the written lock terms so you can distinguish a covered change from one that requires a revised offer.
What happens if the lock expires before closing
If closing takes longer than the lock period, the rate protection may end. You may need an extension, which can cost money. The CFPB notes that an extension fee can apply even when the delay is caused by lender processing. The reviewed consumer guidance does not establish a standard extension-fee amount, so there is no reliable universal figure to budget from without asking your lender.
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- SPEAKS YOUR LANGUAGE: Keys clearly labeled in residential mortgage finance terms like Loan Amt, Int, Term, Pmt; this industry-standard calculator is super easy to use on all realty financing matters from finding a loan that works for your client to considering trust deeds investments, or finding remaining balances or balloon payments and more
- CONFIDENTLY AND EASILY SOLVE: Clients' financial questions whether they're buyers, sellers, investors or renters. Increase your perceived professionalism as a new agent, experienced broker or seasoned loan officer. Close more home sales and impress your clients with fast, accurate answers to all their real estate finance questions from PITI Payments to IRR, NPV and Cashflows
- DEDICATED BUYER QUALIFYING KEYS: Enter client's income, debt and expenses to pre-qualify them to only show properties they can afford. Include tax, insurance and mortgage insurance then compare loan options and payment solutions to give your client choices before they make an offer to buy
- FIGURE OUT THE RIGHT LOAN: For your client at the press of a button for jumbo, conventional, FHA/VA, or even 80:10:10 or 80:15:5 combo loans; check to see if ARMs or bi-weekly loans, quarterly payments or if interest-only payments are the answer; giving your client more choices; easily perform what if loan or TVM calculations find loan amount, term, interest or PITI or PI payments
- BECOME AN INVALUABLE RESOURCE: To your clients by reducing their confusion and uncertainty; ensuring they are able to make a purchase offer; knowing they can afford the down payment; and determining which is the right loan for them. Date-math for listings and contracts too. Comes with a protective slide cover, quick reference guide, pocket user's guide, long-life battery, 1-year warranty
Ask the lender, before locking, what the expiration date is, how an extension is requested, whether the fee is fixed or otherwise determined under the agreement, and what happens if the delay is due to processing. Also ask whether the lender has a procedure for a closing that is likely to occur near expiration. Get the answer in writing: the Loan Estimate does not necessarily state the extension cost.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Float-down options when rates fall
Some lenders may offer a float-down, which can allow a borrower with a lock to take advantage of a lower rate during the lock period. It is a lender-specific feature, not an automatic part of every rate lock, and the sources do not establish universal eligibility rules or costs. Do not treat a verbal mention of a float-down as proof that it is included in your agreement.
Ask these questions before relying on one:
- What rate improvement must occur before the option can be used?
- At what point in the lock period can you exercise it, and by what deadline?
- Is there a fee or another pricing condition?
- Can it be exercised more than once?
- Will the revised rate change points, lender credits or any other quoted pricing?
Have the lender put the applicable rules in writing. If no float-down is offered, a falling market rate does not by itself change your already locked rate.
Compare mortgage offers on the same basis
Compare Loan Estimates for the same loan type and the same borrower and property scenario. A headline rate alone is not a sound comparison if offers use different lock periods or loan assumptions. Include the lock’s duration and expiration, its costs and the pricing attached to it, then ask how the offer changes for another duration.
| Comparison item | What to line up | Why it matters |
|---|---|---|
| Loan scenario | Same loan type and comparable application assumptions. | Differences in the scenario may affect pricing, so the rates may not be directly comparable otherwise. |
| Rate and points or credits | Quoted interest rate together with any points or lender credits shown for that offer. | A lower headline rate does not tell the full pricing story when points or credits differ. |
| Lock duration and expiration | Exact term and expiration date for each offer. | A rate tied to a shorter lock is not equivalent to one protected for a longer period. |
| Initial lock and extension costs | Any fee to lock, whether refundable, and the lender’s stated extension terms. | A potential expiration can create costs that are not necessarily shown on page 1 of the Loan Estimate. |
| Repricing conditions | Written terms describing application changes that can affect pricing. | A quoted rate may depend on the loan details remaining within the conditions of the lock. |
| Float-down | Whether one exists, its trigger, timing, cost and usage rules. | A possible path to a lower rate is useful only if its actual contract terms are clear. |
Ask each lender to explain any difference in lock-duration pricing rather than assuming that the longer term is free or that two quoted rates protect you for the same length of time. Preserve the estimates and lock agreements so you can compare the terms, not just the figures that appear most prominently.
A borrower’s rate-lock checklist
Before committing, ask the lender these questions and request written answers where possible:
- Is my rate locked now? What is the exact expiration date?
- Which lock durations are available, and how would a shorter or longer period change the pricing?
- Is there a fee to lock? Is it refundable, and what would an extension cost?
- What happens if closing slips past expiration, including when processing causes the delay?
- Which changes to loan amount, loan type, down payment, appraisal, credit or documented income could change my rate?
- Is there a float-down option if rates fall? What are its threshold, timing, cost and usage rules?
- Can the rate, points or credits, duration and conditions be stated in the written lock agreement?
Once you have the answers, check that page 1 of your Loan Estimate reflects whether the rate is locked and the applicable date. If the estimate and the written agreement appear inconsistent, ask the lender to clarify the terms before relying on the quote.
How to read the decision in a real transaction
Suppose one buyer has a closing date expected to fall within a proposed lock period and considers the quoted rate acceptable. That buyer can weigh the price of that lock against the exposure involved in floating. A second buyer with a less certain closing timeline may need to focus more closely on the expiration date, the lender’s extension terms and the cost of a longer lock. These are decision examples, not predictions about rates or recommendations that one duration is always best.
For either buyer, the practical test is whether the written lock covers the intended timeline on acceptable terms, and whether the buyer understands the consequences of a delay or an application change. If the answer depends on an unclear fee, an unconfirmed extension or a float-down assumption, get that term from the lender before making the choice.
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