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A mortgage rate lock protects your agreed rate from market-driven increases for a set period; floating leaves your rate exposed to both increases and decreases, while a float-down may let you lower a locked rate if its lender-specific conditions are met. Choose based on your expected closing timeline, comfort with payment uncertainty, and the written cost and rules—not on a guess about where rates are headed. A float-down is not automatic and does not guarantee savings.
At a glance
| Name | Best for | Key spec | Checked |
|---|---|---|---|
| Lock without float-down | Borrowers who value payment certainty during the lock term | Holds the agreed rate against market-driven increases, subject to the agreement and application conditions | November 2026 |
| Float | Borrowers willing to accept uncertainty before locking | Rate remains exposed to market pricing until locked | November 2026 |
| Lock with float-down | Borrowers who want a lock plus a conditional chance to capture a rate decrease | Availability, fee, threshold, timing, and exercise rules depend on the lender | November 2026 |
What is the difference between a rate lock, floating, and a float-down?
A rate lock is an agreement with your lender to hold a specified mortgage interest rate for a stated period. Floating means you have not locked your rate, so it can change with market pricing. A float-down is an optional feature some lenders offer that may allow a borrower to lower a previously locked rate if rates improve and the borrower meets the lender’s terms.
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1Fix the driver behind crashes, sound loss and screen glitches2Clear out junk files and repair common Windows errors3Scan for outdated or missing drivers - takes under a minuteThe Consumer Financial Protection Bureau (CFPB) notes that mortgage rates can change daily, sometimes hourly. A lock protects against market-driven increases during its term, but it generally also means you do not automatically benefit if rates fall. Floating preserves that possibility, but it exposes you to increases until you lock. A float-down attempts to combine some of the protection of a lock with a limited chance to benefit from a later decrease; it is not a standard right attached to every lock. See the CFPB’s rate-lock guidance and Freddie Mac’s explanation of rate locks and float-downs.
| Choice | What happens if market rates rise? | What happens if market rates fall? | Main tradeoff |
|---|---|---|---|
| Lock | The agreed rate is generally protected through the lock term, subject to the written agreement and application conditions. | You may remain at the locked rate unless your lender offers and approves a repricing option. | More certainty, less automatic benefit from a rate decrease. |
| Float | Your rate may rise before you lock. | Your rate may fall before you lock. | Potential for a lower rate comes with exposure to a higher one. |
| Lock with float-down | The lock may protect the agreed rate during its term. | You may be able to lower the rate if the lender’s conditions are met. | Possible extra cost and restrictions; a lower market quote may not qualify. |
Which option should you choose?
There is no choice that is right for every borrower, and the available evidence does not support predicting the direction of future rates. A practical decision weighs the certainty a lock can provide against the chance of a lower rate while floating, then checks whether a float-down’s written terms justify its cost.
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- Consider a standard lock if your closing date is approaching, you want to limit the risk of a higher rate before closing, and the lock term realistically covers your timeline. Confirm what happens if closing slips past expiration.
- Consider floating only if you can tolerate the possibility of a higher rate and payment before you lock. A potential decrease is not assured, and rates may move before you decide to lock.
- Consider a float-down if your lender offers one for your loan and its actual cost, minimum rate drop, exercise window, and repricing rules make sense to you. Do not assume that every decrease in advertised rates will trigger it.
As you compare, focus on the complete pricing and conditions rather than the headline interest rate alone. Ask whether points are locked along with the rate: in some arrangements, points can continue to float even when the rate is fixed, changing the upfront cost. The Federal Reserve’s consumer guide to mortgage lock-ins explains this distinction.
How long does a mortgage rate lock last?
Lock terms vary by lender and loan. The CFPB describes common terms of 30, 45, or 60 days, sometimes longer; Freddie Mac lists 30, 45, 60, or 90 days as standard choices and describes 30 or 45 days as most common. These are published descriptions, not a promise that a particular lender offers every term. Check the exact expiration date in your own written agreement.
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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchChoose a term that realistically reaches closing, not simply the shortest one available. A short lock may cost less or be priced differently, but if closing is delayed you may face an extension charge, revised pricing, or an expired lock. The CFPB cautions that extending a lock can be expensive, and Freddie Mac warns that missing the expiration may mean losing the locked terms. Ask how the lender handles a delay and who is responsible for any extension cost.
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For a purchase, your closing timeline can depend on matters such as completing the loan process and coordinating the transaction. For a refinance, use the timeline your lender gives for that file. Do not assume a typical lock period will necessarily cover your closing; confirm the dates and contingency in writing.
What does a float-down cost, and when can you use it?
There is no universal float-down fee or exercise rule. Lenders set their own availability and conditions; a float-down may involve a fee or pricing adjustment, a minimum improvement in rates, a limited period in which to exercise, or a one-time use. The lender’s terms determine how a new rate is calculated and whether points or other pricing change along with it. Chase’s overview likewise cautions that a float-down does not guarantee savings; its description is an illustration of lender guidance, not a rule for all lenders.
Before paying for the option, ask the lender to show the complete conditions in writing. Compare any fee or pricing adjustment with the payment savings that could result if the option is actually triggered. If the rate drop needed to qualify is larger than the change you receive, if your rate is already near the lender’s floor, or if the exercise window does not match your closing timeline, the feature may not provide value. The available sources do not establish a universal break-even point, so do not treat a generic example as a calculation for your loan.
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Get answers to these questions before deciding:
- Is this feature available for my loan and lock period?
- What minimum rate decrease triggers it, and how does the lender measure that decrease?
- On what dates can I exercise it, and how many times?
- Is there a fee, a change in points, or another pricing adjustment?
- What rate and points would apply after exercise, and can I receive the revised terms in writing?
What costs and loan terms should you compare?
The interest rate is important, but it is not the only number to verify. Ask whether the lock itself carries a charge, whether a longer lock changes pricing, what an extension would cost, and whether any fee is refundable under specified circumstances. The CFPB says a Loan Estimate indicates whether the rate is locked and for how long, but does not state the amount charged for the particular lock period or extension. Ask the lender directly for those costs rather than assuming they appear on the estimate.
Confirm whether the rate and discount points are both locked. A fixed rate does not necessarily mean every part of the pricing is fixed: under some arrangements, points can continue to move. Since points affect the upfront cost, ask for both the rate and points, and for any conditions that could change either one, in the written lock agreement or updated loan documents.
Also compare the rate and terms for the loan you actually expect to close. Changes to your loan amount, down payment, loan type, credit profile, appraisal, or verified income may affect the terms or require an updated Loan Estimate or lock agreement. A lock is not a substitute for keeping the application accurate and notifying the lender when circumstances change.
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How should you make the decision before closing?
Use this sequence to turn a general preference into a decision about your actual loan:
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Clear out junk files and repair common Windows errorsFree Scan →Scan for outdated or missing drivers - takes under a minuteDriver Scan →- Establish your closing timeline. Ask the lender for the expected closing date and how much time the loan still needs. Compare that with the proposed expiration date, allowing for the possibility of a delay rather than assuming the earliest date will hold.
- Write down the lock terms. Confirm whether the rate is locked now, the exact rate, the expiration date, whether points are locked, and any application conditions. If you have not locked, confirm that status rather than relying on a verbal impression.
- Price the downside of a delay. Find out what happens if closing occurs after expiration: whether an extension is available, what it costs, whether the rate or other pricing can change, and who pays. Do not treat an extension as automatic.
- Assess how much uncertainty you can accept. If a rate increase before closing would make the payment or loan terms unacceptable, that is a reason to give the protection of a lock significant weight. If you float, be prepared for rates to rise as well as fall.
- Evaluate any float-down in writing. Request the trigger, fee or pricing adjustment, exercise dates, number of uses, and the method for setting the new rate and points. Consider whether you can meet the conditions before your closing date.
- Compare full costs and keep records. Ask for the lock agreement and any updated Loan Estimate or repricing in writing. If the application or closing date changes, ask the lender promptly whether that affects the lock.
The CFPB’s Home Loan Toolkit is another source of consumer guidance on rate locks and the choice between locking and floating.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What should you ask your lender?
Ask for exact terms rather than a general assurance that your rate is “protected.” The answers should identify what is fixed, what can change, and what you would owe if the timeline shifts.
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- Is my rate locked now? What is the exact expiration date, and are points locked too?
- What does this lock period cost compared with a shorter or longer one? What would an extension cost, and are any fees refundable in specific circumstances?
- If closing is delayed, what happens to the rate and other pricing, and who pays any extension charge?
- Is a float-down available for my loan? What minimum rate change triggers it, when can I exercise it, how many times, and what fee or price adjustment applies?
- Which changes to my application, appraisal, credit, income, down payment, loan amount, or loan type could alter the locked terms?
- Can I receive the lock terms and any later repricing in a written lock agreement or updated Loan Estimate?
The CFPB specifically prompts borrowers to ask what a lock means, what period it covers, what shorter or longer terms cost, what happens if closing is delayed, whether application conditions can change the rate, and what happens if rates fall. Those questions are especially useful because the details are lender- and loan-specific.
What is the safest way to compare your choices?
Compare only choices your lender actually offers for your loan, using the same loan assumptions and timeline. Put the locked rate, expiration, points, upfront lock cost, extension terms, and float-down rules side by side. If the lender offers a float-down, compare the rate and price you would receive if it qualifies—not an assumed market quote—with the fee and restrictions.
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Then decide which risk matters more to your household: paying more if rates rise before a lock, or giving up some opportunity to benefit if they fall after you lock. A standard lock trades that uncertainty for a defined period of rate protection; floating leaves both outcomes open; a float-down may alter the tradeoff but only under its written rules. No option makes a future rate move predictable, and a lower rate alone does not establish that a feature saves money once fees and points are counted.
Frequently Asked Questions
Does a mortgage rate lock guarantee that my final loan terms cannot change?
No. A lock agreement has conditions, and a material change in the application—such as the loan amount, down payment, credit profile, appraisal, or verified income—may affect the terms. Ask the lender which changes matter and whether it will issue an updated Loan Estimate or lock agreement.
Does a rate lock also lock discount points?
Not always. Some arrangements fix the interest rate while points continue to float, which can change the upfront cost; ask the lender to confirm in writing whether both are fixed.
Where can I see whether my mortgage rate is locked?
The CFPB says the Loan Estimate states whether the rate is locked and the length of the lock period. It does not show the amount charged for a particular lock period or extension, so ask the lender for those costs separately.
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