A rate lock freezes your quoted interest rate and points for a set number of days. Floating leaves your rate free to rise or fall with the market until you decide to lock. If your closing date is close or your payment is near your approval limit, locking removes a risk you may not be able to absorb. If your closing is far off and your budget has real cushion, floating is tolerable, but it is a risk, not a strategy. Duane Buziak explains below how each choice works, what a quarter-point move costs in real dollars, and how to compare lock terms for free with a soft-pull before you commit.
How a Rate Lock and a Float Each Work Day to Day
When you lock, your broker or lender commits a specific rate and pricing for a stated period, commonly 30, 45, or 60 days. In exchange, you agree to close within that window. The lock is tied to a particular loan program, loan amount, and property, so changing any of those can change or void the terms.
When you float, the number on your quote is only an estimate. Your actual rate is whatever pricing is available on the day you choose to lock. Wholesale pricing can be reissued more than once in a single day, so the same loan can be priced differently at 9 a.m. and at 2 p.m.
Terms you will see on a lock confirmation
- Lock period: the number of days the rate is held.
- Lock expiration: the last date you can close at the locked rate.
- Extension: additional days purchased if closing slips past expiration, often for a fee or a pricing adjustment.
- Float-down option: a feature that may let you capture a lower rate after locking, usually under conditions and sometimes for a fee.
- Rate sheet repricing: the intraday changes in pricing that make an unlocked quote a moving target.
Two misconceptions cause most of the confusion. A Loan Estimate is not a lock: it is a disclosure of expected terms, and the rate on it may or may not be locked. And a lock is not a loan approval. You can hold a locked rate and still be denied if your income, credit, appraisal, or documentation does not hold up in underwriting. The CFPB’s consumer guidance on mortgage rate locks covers the basics, and lock policies vary by lender, so confirm the details of yours in writing.
What Moves Mortgage Rates While You Float
The Federal Reserve does not set mortgage rates. The Fed sets a short-term policy rate, while mortgage pricing follows trading in the bond market, particularly mortgage-backed securities that investors buy and sell. When investors demand higher yields on those securities, mortgage rates tend to rise, and the reverse is also true. The Fed’s decisions and statements can influence that trading, but the link is indirect, and mortgage rates sometimes move in the opposite direction from what the headlines suggest.
Scheduled releases such as jobs and inflation reports can produce sharp same-day swings. Nobody, brokers included, can reliably time them. Anyone who tells you rates are about to fall is offering an opinion, not information, and this article makes no prediction about direction.
For a sense of the current level, check Freddie Mac’s Primary Mortgage Market Survey, which publishes weekly national averages. Treat any figure as a snapshot as of its publication date, not a quote for your loan, since your own rate depends on credit, down payment, loan size, property type, and points.
Loan size matters here too. As of the 2026 limits published by the Federal Housing Finance Agency, the baseline conforming loan limit for a one-unit property is $832,750, rising to $1,249,125 in high-cost areas. Limits vary by county, so check yours on the FHFA site. Loans above the limit are priced differently, and a larger balance magnifies every rate move because each quarter-point applies to more dollars.
The key point about floating is that it is a bet on direction, and the downside is not symmetrical for everyone. If your debt-to-income ratio is tight or your contract has a hard deadline, a rate increase can push you past your approval limit, while a decrease merely improves a payment you could already afford.
A Worked Dollar Example: What a Quarter-Point Swing Costs
Suppose you are financing $400,000 on a 30-year fixed loan. This is an illustration, not a quote.
- At 6.50%, principal and interest is about $2,528 per month.
- At 6.75%, principal and interest is about $2,594 per month.
The difference is roughly $66 per month. Over 360 payments, that adds up to about $23,800 ($2,528.27 times 360 is about $910,177, versus $2,594.39 times 360, about $933,980). Those figures cover principal and interest only, not taxes, insurance, or mortgage insurance.
The same math works in your favor. If you float and the rate drops from 6.50% to 6.25%, the payment falls by about the same amount. Floating can help as easily as hurt, which is exactly why it feels tempting. The difference is in what each outcome does to you. A $66 monthly increase might be the margin between approval and a denial. A $66 decrease is welcome but rarely changes what you can buy.
Now add the cost of certainty. Suppose a longer lock period prices about 0.125 points higher, or an extension costs a flat fee. On a $400,000 loan, 0.125 points is $500. Those are illustrative numbers only, because lock pricing and extension fees vary by lender and market conditions, and some locks carry no separate fee at all. If paying $500 for a longer lock keeps you from a $66 monthly increase, you break even in under eight months of payments, and the lock also protects you from a larger move.
APR disclosure: the rates and payments above are hypothetical and shown for illustration. They are not offers. The annual percentage rate (APR) on a real loan includes fees and points and is typically higher than the note rate. Your actual rate, APR, and payment depend on your credit profile, loan amount, property, and the pricing on the day you lock.
Lock Length, Extensions, and Float-Down Options Compared
The four common approaches differ mainly in how much certainty you buy and what it costs.
| Approach | Rate certainty | Upside if rates fall | Typical cost or pricing impact | Best-fit situation |
|---|---|---|---|---|
| Float | None until you lock | Full, if you lock after a drop | No lock cost, but exposure to increases | Distant closing and a wide payment cushion |
| Standard Lock (30 to 45 days) | Fixed through expiration | None, unless the lock allows a float-down | Often built into the quoted pricing | Closing within weeks on a clean file |
| Longer Lock (60 days or more) | Fixed for a longer window | None, unless the lock allows a float-down | May carry slightly higher pricing | New construction or slower closings |
| Lock with Float-Down | Fixed, with a one-time chance to improve | Partial, under the stated conditions | Usually a fee or a rate adjustment | Buyers who want protection plus some upside |
Longer locks can price slightly higher because the party holding the rate carries market risk for more days. New construction and slow closings often need longer terms, since a 30-day lock on a home that will not be finished for 90 days will expire first.
If your lock expires before closing, the options generally are to pay for an extension, accept current market pricing, or in some cases accept the worse of the locked and current rates. Terms vary by lender, so ask what an extension costs per day and what happens at expiration before you lock, not after. Delays caused by the lender’s own errors are sometimes treated differently than delays on your side, so ask about that too.
Float-down policies also differ. Many require a fee or an adjusted rate, and some set a minimum market drop before you can use it, or allow it only once. Get any float-down terms in writing and read the conditions before you rely on it.
How to Decide: A Checklist for Your Timeline and Budget
Work through these steps in order:
- Check your closing date against realistic processing time. Appraisal scheduling, underwriting conditions, and title work often take longer than buyers expect. A lock shorter than your realistic timeline invites an extension fee.
- Test your budget against a higher rate. Recalculate your payment at a quarter-point and a half-point above your quote. If approval or comfort breaks, floating is a risk you cannot afford.
- Confirm your contract’s financing contingency date. That date shows how long you have before a rate-driven problem becomes a deposit-at-risk problem.
Lock sooner when your payment is near your approval limit, when closing is within a few weeks, or when a rate rise would force you into a different loan structure. In those cases, you give up a possible gain to remove a possible failure.
Floating may be tolerable when your cushion is wide and closing is far out. Even then, call it what it is: a risk you are choosing to take, not a plan. Some borrowers set a personal rule, such as locking once the rate is within an amount they can comfortably pay, rather than waiting for a target they cannot control.
If you are refinancing and comparing offers
For active rate-shoppers, a lock only helps if the underlying rate was competitive when you locked it. Collect offers first, then compare lock terms side by side: lock period, extension cost, and float-down availability. A longer lock on an uncompetitive rate simply preserves a mediocre deal, so compare before committing to any lock.
Why a Broker Can Compare Lock Terms Across Wholesale Lenders
A national direct lender can offer you its own pricing and its own lock policies, and nothing else. That is a single shelf. A broker works differently, requesting pricing from hundreds of wholesale lenders and comparing their rates and lock policies for your specific loan. One wholesale lender may price a 45-day lock more favorably, while another may offer a more flexible extension. You can only see those differences if more than one shelf is on the table.
Duane Buziak recommends comparing the rate, points, lock period, extension terms, and float-down terms together, rather than the rate alone. That is the idea behind Dare to Compare: put competing offers next to each other and see which package fits your timeline, not just which number looks lowest on page one. A slightly higher rate with a free extension can cost less than a lower rate that adds fees if your closing slips.
To keep shopping from costing you, Free Mortgage Search by Duane Buziak uses a NoTouch Credit Pull. It is a soft-pull comparison with no hard inquiry, so you can review options without adding inquiries to your credit report before you choose. A hard pull comes later, when you decide to move forward with a specific loan.
The comparison tool is free and carries no obligation. If closing costs are a concern, ask about no-out-of-pocket closing options, which may be structured through pricing or credits depending on the loan and the market. Duane Buziak has been helping buyers find the right mortgage since 2014, and the approach has stayed the same: show the options, explain the trade-offs, and let you decide.
Rate Lock vs Float FAQ
1. Does locking a rate affect my credit?
No. A lock is a pricing commitment and does not itself change your credit score. The credit inquiry comes from the credit pull when you apply, not from the lock.
2. Is a Loan Estimate the same as a lock?
No. A Loan Estimate discloses expected terms and costs. Your rate is only fixed if the loan has been locked, so check whether the rate on your estimate is marked as locked.
3. How long should I lock?
Long enough to cover your realistic closing timeline, plus a small buffer. Thirty to 45 days is common for a standard purchase. New construction or complex files may need 60 days or more, and longer periods can price slightly higher.
4. What if rates drop after I lock?
You generally keep your locked rate, which is the trade-off for certainty. A float-down option may let you capture a lower rate, but terms, fees, and conditions vary by lender, so get them in writing before you lock.
5. What if my lock expires?
You may be able to extend it for a fee or a pricing adjustment, or you may re-lock at current market pricing. Policies vary by lender, so ask what an extension costs and what happens at expiration before you lock.
6. Can I lock before I find a home?
Generally not. A lock is tied to a specific property and loan, so most lenders require an identified property first. Some lenders offer pre-contract programs, so ask what is available before assuming otherwise.
7. Does locking cost money?
Not always. Many standard locks have no separate fee, though longer periods, extensions, and float-down options can add cost. Lock fees are not universal, so ask for the exact terms in writing.
8. Can I compare lock terms without a hard credit pull?
Yes. Free Mortgage Search by Duane Buziak uses a NoTouch Credit Pull, a soft-pull comparison with no hard inquiry, so you can see rates and lock terms from multiple wholesale lenders at no cost and with no obligation.
The Lock or Float Decision Comes Down to Your Closing Date and Your Budget
The right choice depends on two things you can measure: how soon you will close and how much of a rate increase your budget can absorb. If either answer makes you uneasy, lock. If both are comfortable, floating is a risk you are choosing, and it should stay a conscious one.
Your dream home is within reach. Start comparing personalized mortgage rates from trusted lenders today and discover the loan solution that fits your budget and goals. Compare rates now and take the first step toward securing your home with expert guidance every step of the way. Run a free NoTouch Credit Pull comparison, then Dare to Compare the lock terms side by side.
