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A mortgage rate lock holds a quoted interest rate for a defined period, subject to the conditions in your lender’s written agreement. If your closing may fall near or after the expiration date, contact the lender before the deadline to ask whether an extension is available, what it costs, and what happens if the lock expires. If rates fall after you lock, a float-down may let you take a lower rate, but it is an optional feature with lender-specific rules—not a standard guarantee.
This guide is for U.S. borrowers. Lock periods, extension charges, expiration remedies, and float-down eligibility vary by lender, loan program, and agreement. Use the written terms—not a general rule or verbal assumption—to decide what applies to your loan.
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What does a mortgage rate lock do?
A rate lock sets the interest rate for a stated period, subject to the lock agreement and the details of your application. Your Loan Estimate may show whether the rate is locked or floating. A floating rate can move up or down before you lock; a locked rate is intended to hold under the agreement’s conditions for the agreed period.
The lock period is a deadline, not a prediction of when your loan will close. The Consumer Financial Protection Bureau (CFPB) gives 30, 45, and 60 days as examples of typical lock periods, sometimes longer. They are examples, not a promise that every lender offers those terms or that a particular period is right for your transaction.
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A lock also does not necessarily freeze every aspect of your loan. The CFPB notes that changes to application details—including the loan amount, credit score, or verified income—may affect the rate. Ask which changes matter under your agreement, and tell your lender promptly if your financial or transaction details change.
What should I check on my Loan Estimate and lock agreement?
Read the rate-lock information alongside the rest of the offer. A quoted rate alone does not tell you how long it is protected, what the lock costs, or what happens if closing slips.
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1Repair Windows errors before they cause bigger problems2Scan for outdated or missing drivers - takes under a minute3Clear out junk files and repair common Windows errors- Lock status: Is the rate locked or floating? If it is locked, confirm the effective date and expiration date.
- Lock duration: What time frame does the Loan Estimate provide? Ask whether a shorter or longer period is available and at what cost.
- Price of the lock: Find out whether there is an upfront fee or whether the price is reflected in points, lender credits, or another part of the offer. Confirm the amount and how it is charged in writing.
- Expiration handling: Ask what choices you have if closing is delayed, whether you must request an extension before expiration, and how the rate and other pricing would be set if the lock ends.
- Rate-change conditions: Ask what changes to your application or transaction could affect the locked rate or loan terms.
- Float-down: If offered, get the threshold, deadline, eligibility rules, and any charge in writing.
Keep the dated Loan Estimate, lock confirmation, and later written updates together. If the lender changes a term, ask for an explanation and an updated Loan Estimate when applicable. The point is not to infer a guarantee from the word “locked”; it is to understand the conditions attached to your specific agreement.
What if my lock expires before closing?
There is no single outcome that applies to every borrower. The agreement and lender determine what happens when the expiration date passes, so contact the loan officer before the deadline and ask for the available options and their costs in writing.
Depending on the lender’s rules and your circumstances, the path may involve an extension or a new pricing decision. Do not assume you will automatically keep the locked rate, automatically receive the current market rate, or owe a particular fee. The CFPB specifically recommends asking what happens if closing is delayed and the lock expires.
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Start as soon as a delay becomes plausible, rather than waiting until expiration day. Ask the lender to confirm:
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- the exact expiration date and time, if specified;
- whether an extension is available and whether it must be requested or completed before expiration;
- the extension length and the new expiration date;
- the amount and form of any charge, and whether points, credits, or the rate itself change;
- what rate and pricing would apply if the lock expires without an extension; and
- whether anything else in your application or loan terms could change as a result.
Compare the response with your closing schedule and get the lender’s answer in a message or updated documents. A verbal estimate can help you understand the choices, but the written terms are what you need to evaluate the cost and conditions.
Can I extend my mortgage rate lock?
Possibly, but an extension is not safe to assume automatic or free. Ask your lender whether it is available for your loan, when it must be requested, how long it lasts, and exactly what it costs.
The CFPB cautions that an extension can be expensive. The Federal Reserve’s consumer guide describes possible fee structures such as a flat charge, a percentage of the mortgage amount, or an addition expressed as a fraction of a percentage point to the interest rate. That guide is older background on how charges may be structured; it is not a current price list or evidence that every lender uses those methods. Get the amount and calculation for your own loan from the lender.
Ask whether the quoted extension price changes if you need a different number of days, and whether it affects points, lender credits, or other terms. Compare the total written cost with the alternative the lender says would apply after expiration. Do not compare only the fee if the rate or other pricing could also change.
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Some investor or program rules address extensions for specific mortgage products. For example, Fannie Mae’s Section 305, effective May 20, 2026, says a described Streamlined Rate Lock Mortgage Loan must be fully underwritten and meet modification requirements before the rate-lock and commitment expiration dates are extended. This is a program-specific seller/servicer rule, not a general consumer right or a rule for every mortgage. Your lender can tell you whether a particular program rule applies to your loan.
What is a float-down, and can it lower my rate?
A float-down is an option some lenders may offer that can allow a borrower to take advantage of a lower rate during the lock period. It is not automatic: availability and terms vary, so ask about it before locking and check the written agreement.
Ask these questions before relying on the feature:
- Must you elect or pay for the float-down when the initial lock is made?
- How far must rates fall before you qualify, and how is the comparison rate determined?
- When can you request the lower rate, and is there a deadline or a limit on the number of requests?
- Does the option apply to your loan type and current application, and what fee or pricing adjustment applies?
- Does exercising it change the lock expiration date or any other loan terms?
Freddie Mac advises borrowers to ask their lender about the terms and availability of float-down options. A program’s policy should not be generalized to other lenders: for example, the California Housing Finance Agency says its program does not offer a float-down once a rate is locked. That policy is specific to CalHFA’s program.
A float-down can reduce the downside of locking before rates fall, but it may involve a fee or eligibility conditions, and it does not eliminate the need to understand the expiration date. If no float-down is available, locking protects against some upward movement during the term but may mean you do not benefit from lower market pricing. Leaving the rate floating preserves the possibility of a lower rate but also leaves it exposed to increases before lock. No one can establish which direction rates will move from the lock terms alone.
Can my locked rate still change?
Yes, under circumstances described in the agreement. A lock is not necessarily a guarantee that the rate will remain unchanged if important application details change.
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The CFPB gives examples that include a change in loan amount, credit score, or verified income. Ask the lender which changes could trigger a reprice or affect eligibility for the original terms, and what documentation or notice you would receive. If a change occurs, request a written explanation and an updated Loan Estimate when applicable. Do not assume that a change will have no effect—or that it automatically voids the lock—without checking the agreement and lender’s response.
How should I compare rate-lock offers from lenders?
Compare offers using the same loan assumptions and the full cost of the lock, not just the advertised interest rate. A lower quoted rate may come with different points, lock length, extension terms, or credits, so it does not by itself establish the better offer.
For each lender, line up the same loan amount and loan type, then record:
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- lock period, lock fee, and expiration date;
- availability and written price of an extension;
- what the lender says happens if the lock expires;
- float-down availability, trigger, timing, and fee; and
- conditions that could change the rate or other terms.
Ask each lender what happens if your closing date moves. Compare the written options for the timeline you actually face, including any extension cost and changes to rate, points, or credits. The CFPB and Federal Reserve materials support comparing these terms, but they do not supply a universal break-even formula; the value depends on the actual offers and your circumstances.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What should I ask my lender before I lock?
Use direct questions and ask for answers that match your Loan Estimate and lock confirmation. The CFPB’s home-loan toolkit suggests questions such as:
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- “What does it mean if I lock my rate today?”
- “What rate lock time frame does this Loan Estimate provide?”
- “Is a shorter or longer rate lock available, and at what cost?”
- “What if my closing is delayed and the rate lock expires?”
- “If I lock my rate, are there any conditions under which my rate could still change?”
If a float-down matters to you, also ask whether the lender offers one, what rate drop qualifies, when you can use it, and whether it has a fee. Request the relevant terms in the written agreement rather than relying on a general description of the lender’s policy.
For context, the Federal Reserve’s consumer guide to mortgage lock-ins can help explain why lock terms and charges matter. For borrower decisions, however, use current written information from your lender: older general guidance cannot tell you today’s extension price or the terms of your specific loan.
Frequently Asked Questions
Does a mortgage rate lock guarantee that my loan will close?
No. A rate lock concerns the interest-rate terms for a defined period; it does not, by itself, guarantee loan approval or completion of the purchase. Continue meeting your lender’s documentation requests and confirm any approval or closing conditions separately.
Does a rate lock protect me from every change in mortgage pricing?
Not necessarily. The agreement may define what is locked and under what conditions, while application changes can affect the rate or terms. Ask the lender to distinguish the interest rate from points, credits, fees, and other terms in your offer.
Should I wait to lock until I know my closing date?
The right timing depends on the expected closing schedule, the lender’s available lock periods and pricing, and your tolerance for rate uncertainty. Ask for the cost and expiration implications of the available periods rather than trying to predict future rates.
Can I switch lenders if my rate lock is about to expire?
You can ask another lender for an offer, but a new application and timeline may affect whether it can meet your closing date. Compare the new written terms and ask both lenders about expiration and closing timing before making a decision.
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