When to Lock Your Mortgage Rate in Texas: Float-Downs Explained
I am Anthony Ferrando, a mortgage loan originator licensed across Texas (NMLS# 1919613), and the question I field most often once a buyer is under contract is some version of “should I lock now or wait?” It is a fair question, and the honest answer is that locking your rate is about protecting a payment you have already decided you can live with, not about trying to outguess the market. Freddie Mac’s PMMS put the average 30-year fixed at 6.49% for the week ending June 25, 2026, but where any single rate lands depends on your file and the day you lock it.
A rate lock freezes your interest rate for a set window while your loan moves to closing. Understanding the lock periods, the cost of extending, and the float-down option puts you in control of the one variable that quietly drives your monthly payment.
Key points:
- A rate lock holds your rate for a set period, commonly 15, 30, 45, 60, or 90 days.
- You usually lock after you are under contract on a specific property, though some lenders allow earlier locks.
- If rates rise after you lock, you keep your locked rate. If they fall, you are generally stuck unless you have a float-down.
- A float-down option lets you capture a lower rate once if the market improves before closing, usually for a fee.
- Lock extensions cost money, so the lock period should comfortably cover your expected closing date.
- New-construction buyers often need extended locks of 90 to 180 days or longer.
What does it mean to lock your mortgage rate?
Locking your rate means your lender guarantees a specific interest rate for a defined number of days while your loan is processed and closed. Once locked, day-to-day market moves no longer change your rate, as long as you close inside the lock window and your loan details do not change. It removes the guesswork from the single number that shapes your monthly payment.
The lock is tied to the specifics of your file: loan amount, property, credit, and program. If something material changes, like the loan amount or your occupancy, the lock can be repriced. That is why an accurate application up front protects the rate you lock.
When should you lock your rate in Texas?
Most Texas buyers lock once they are under contract on a specific home and the closing date is in view, because that is when the lock period can be matched to a real timeline. If the payment at today’s rate fits your budget and you would lose sleep over it moving higher, locking gives you certainty. Trying to time the bottom usually costs more in stress than it saves in dollars.
Rates may rise or fall between your application and your closing, and no one can promise which. The buyers who handle this well decide in advance what monthly payment they are comfortable with, then lock when the available rate delivers that payment. The decision becomes about your budget rather than a forecast.
Lock vs. float: how the choice actually breaks down
Floating means choosing not to lock yet, betting that rates will hold or improve before you close. It can pay off, and it can backfire. Here is how the two paths compare for a typical Texas buyer under contract.
| Scenario | If you lock | If you float |
|---|---|---|
| Rates rise before closing | You keep your lower locked rate | You pay the higher rate |
| Rates fall before closing | Stuck at your rate unless you have a float-down | You capture the lower rate |
| Rates hold steady | No change, full certainty | No change, but you carried the risk |
| Best fit for | Buyers who want a known payment | Buyers who can absorb a higher payment |
For most buyers on a defined budget, the certainty of a lock is worth more than the chance of catching a slightly lower rate. If you want to watch where rates sit before you decide, our rolling Texas mortgage rates page tracks the latest Freddie Mac figures.
What is a float-down option?
A float-down lets you lock a rate now and still drop to a lower rate one time if the market improves before you close, usually in exchange for a fee or a slightly higher starting rate. It gives you the protection of a lock with one shot at a better rate. The catch is that the improvement usually has to clear a minimum threshold to trigger, so a tiny dip may not qualify.
Whether a float-down is worth the cost depends on how far you are from closing and how much rates would need to move to come out ahead. On a longer timeline, the option has more value because there is more time for the market to shift. I walk clients through that math case by case, since the right answer changes with the size of the loan and the length of the lock.
How long should your lock period be?
Your lock should comfortably cover the time from lock to closing, with a few days of cushion. A standard purchase often closes in 30 to 45 days, so a 45-day lock is common. Longer locks cost a little more in rate, but a lock that expires before closing can force an extension fee or, worse, a worse rate.
New construction is the big exception. If your home is months from completion, you may need a 90, 120, or 180-day lock, and some builders fund extended locks as an incentive. A buyer in Frisco I worked with on a build finishing in the fall needed a long lock to protect the payment they qualified for at application. At Mortgage Austin and across my Texas clients, matching the lock to the real timeline is one of the simplest ways to avoid a late-stage surprise.
What happens if your rate lock expires?
If your lock expires before you close, you typically have to extend it or accept whatever rate is available that day, often called worst-case pricing. Extensions usually carry a fee based on the loan amount and the number of extra days. The cleanest way to avoid this is to build cushion into the lock period and keep your documents moving so the loan does not stall.
Delays that eat into a lock often trace back to slow paperwork, appraisal timing, or last-minute changes to the file. Staying responsive to your loan officer’s requests protects both your closing date and your rate. For buyers also weighing whether to buy points, our guide on discount points and buydowns pairs naturally with a lock decision.
Frequently Asked Questions
When can I lock my mortgage rate in Texas?
Most lenders let you lock once you are under contract on a specific property and have an application in process. Some allow earlier locks, including pre-approval locks on certain programs. Locking after you are under contract is most common because the lock period can then be matched to your actual closing date.
What happens if rates drop after I lock?
If rates fall after you lock, you are generally committed to your locked rate unless you bought a float-down option. A float-down lets you move to a lower rate one time if the market improves enough to clear the trigger. Without it, the lock protects you when rates rise but holds you in place when they fall.
How much does it cost to extend a rate lock?
Extension fees are usually based on your loan amount and the number of extra days, often a small fraction of a percent of the loan. The exact cost varies by lender and how long an extension you need. Building a few days of cushion into your original lock period is the simplest way to avoid paying for one.
Is a float-down option worth it?
It depends on your timeline and how far rates would need to move to come out ahead. On a longer lock, a float-down has more value because there is more time for the market to shift. On a short 30-day lock, the fee may outweigh the likely benefit. Run the numbers for your specific loan size and lock length.
How long should I lock my rate for new construction?
New-construction buyers often need extended locks of 90, 120, or 180 days because completion can be months away. Some builders fund these extended locks or float-down options as part of an incentive package. Match the lock to your realistic completion date so the rate you qualified for is still in place when the home is ready.
Can my locked rate still change before closing?
A locked rate can be repriced if material details of your loan change, such as the loan amount, the property, your occupancy, or your credit profile. As long as your file stays consistent and you close within the lock window, your rate holds. Keeping your application accurate from the start protects the rate you lock.
Not sure whether to lock or float?
The right call depends on your timeline, your budget, and how much payment certainty matters to you. Reach out and let’s talk through your options, no pressure, and we will figure out the lock strategy that fits your situation.
Anthony Ferrando | Mortgage Loan Originator | NMLS# 1919613 | Ferrando Financial LLC NMLS# 2403080 | Licensed in Texas. This is not a commitment to lend. Loan approval is subject to credit, income, and property qualifications. Rate-lock terms, float-down availability, and extension fees vary by lender and program; any rate figure cited is illustrative, not a quote. Source: Freddie Mac Primary Mortgage Market Survey, week ending June 25, 2026. Equal Housing Lender.
