Why Your Locked Mortgage Rate Can Still Change Before Closing in Texas

Rate lock extensions are requested on a significant share of Texas mortgage transactions every year. The borrower locked a rate, got comfortable with the monthly payment, and then discovered that the locked rate was no longer guaranteed because of something that happened after the lock was placed. Understanding how rate locks actually work, and what can move them, prevents that surprise at the closing table.

What a Rate Lock Actually Guarantees

A rate lock is an agreement between you and your lender to hold a specific interest rate and point combination for a defined period. The lock covers the rate itself. It does not guarantee loan approval, final terms, or a specific monthly payment if any other loan parameters change.

The lock is conditional on your loan closing within the lock period with the same loan amount, program type, property, and borrower profile that were present when the lock was placed. If any of those factors change, the lock terms can change with them.

Common Reasons a Locked Rate Changes

Several scenarios can result in a locked rate no longer applying to your closing:

Lock expiration. The most common reason. Locks are granted for defined periods, typically 30, 45, or 60 days. If your closing is delayed past the expiration date, the lock expires. Your lender will need to extend or re-lock at current market rates, which may be higher or lower than your original lock.

Loan program change. If you switch from a conventional to an FHA loan after locking, or change your down payment amount enough to cross a pricing threshold, the rate associated with the new program may differ from your locked rate. The lock tied to your original program does not automatically transfer.

Property type reclassification. A property that appeared to be a standard single-family home may be classified differently during the appraisal or underwriting process. Condominiums, properties with more than four units, or homes with certain characteristics can be priced differently by the lender, which can affect the rate even if you locked.

Credit profile changes. Rate locks are priced based on your credit score at the time of lock. If your score drops between lock and closing, perhaps due to a new inquiry, a new credit account, or a missed payment, the lender may reprice the loan based on the updated profile.

Appraisal comes in low. If your loan-to-value ratio changes because the property appraises below the purchase price and you reduce your loan amount to match, the rate tied to your original LTV may no longer apply.

How Long Rate Locks Last in Texas

Most Texas lenders offer lock periods of 30, 45, 60, or 90 days. Longer lock periods cost more because the lender is taking on more market risk. The pricing difference typically runs:

• 30 days: standard baseline pricing
• 45 days: approximately 0.125% of the loan amount in additional cost, added as a higher rate or upfront points
• 60 days: approximately 0.25% of the loan amount
• 90 days: approximately 0.375% to 0.50% of the loan amount

These are general market estimates. Actual pricing varies by lender and market conditions. For a $400,000 loan, a 90-day lock instead of a 30-day lock might cost an additional $1,500 to $2,000, either as a direct fee or as a slightly higher rate. For new construction purchases where closing dates are often 60 to 90 days out, the longer lock period is frequently worth the cost.

Float-Down Provisions: When They Are Worth Considering

Some lenders offer a float-down option: you lock your rate today, but if market rates drop by a defined threshold before closing, you can capture the lower rate. Float-downs typically cost 0.25% to 0.50% of the loan amount as an upfront fee, and they require rates to fall by a minimum amount (often 0.25% to 0.50%) before the lower rate kicks in.

A float-down makes sense if you believe rates may decrease meaningfully before your closing date and you are willing to pay for the optionality. It does not make sense if you expect rates to hold steady or increase, since you pay the fee regardless of whether rates move in your favor.

Whether rates will fall before your closing date depends on Federal Reserve policy, inflation data, and bond market conditions, none of which can be predicted with certainty. Your lender can walk you through a break-even analysis for a float-down option if you are considering one.

How to Protect Your Rate Between Lock and Closing

Most rate lock failures come from borrower actions, not lender errors. Protecting your rate is largely within your control:

• Do not take on new debt. No new credit cards, auto loans, personal loans, or large financed purchases after your lock date. New accounts and inquiries can lower your credit score and change your debt-to-income ratio, both of which affect your loan terms.
• Do not change jobs. Employment changes during a transaction require updated documentation and can delay closing past your lock expiration, or change your income calculation in ways that affect qualification.
• Respond quickly to lender requests. Underwriting conditions that sit unanswered for days add up. Every delay increases the chance your lock expires. Make document requests your highest priority during the transaction period.
• Monitor your lock expiration date. Know exactly when your lock expires and flag the date with your loan officer at least 10 days before expiration. If the closing is running behind schedule, discuss extension options proactively rather than waiting until the last day.
• Avoid large bank deposits. Large unexplained deposits in your bank accounts during the underwriting period require documentation. Source the funds ahead of time and let your lender know if a large transfer is coming.

What to Do If Your Lock Expires

If your lock expires before closing, your lender will typically offer a lock extension at a cost, or re-lock at the current market rate. Extension fees usually run 0.125% to 0.25% of the loan amount per 15-day extension period. In a market where rates have moved higher since your original lock, a re-lock will price at the new, higher rate.

If your lock has expired and you are not yet in a position to close, discuss all three options with your lender: extend the existing lock at a fee, re-lock at current rates, or float unlocked until the closing date is confirmed. Each carries different risk and cost depending on where rates are and how close you are to closing.

Before any of this becomes necessary, review your pre-approval status with your loan officer. Having a solid pre-approval in place before you go under contract reduces surprises during the lock period. See our guide on what sellers actually see in a pre-approval letter at Pre-Approval vs. Pre-Qualification in Texas: What Sellers Actually See.

Also useful: Closing Costs in Texas: What’s Standard and What’s Negotiable, which covers all the charges that will appear on your Closing Disclosure, some of which can change between your initial Loan Estimate and your final closing date.

Frequently Asked Questions

Can my interest rate go up after I lock it in Texas?

Your locked rate holds if your loan closes within the lock period with the same program, loan amount, property, and borrower profile used when the lock was placed. If any of those factors change, such as a program switch or a credit score drop, the lender may reprice the loan. If your lock expires before closing, you will need to extend or re-lock at current market rates, which may be higher.

How much does a rate lock extension cost in Texas?

Lock extensions typically cost 0.125% to 0.25% of the loan amount per 15-day extension period. On a $400,000 loan, a 15-day extension might cost $500 to $1,000 depending on your lender’s pricing. Some lenders cover short extensions if the delay is due to their own processing, but this varies and should not be assumed.

Should I get a 30-day or 60-day rate lock for a Texas home purchase?

Choose your lock period based on how confident you are in the closing timeline. For a standard resale purchase with an experienced team, 30 to 45 days is typically sufficient. For new construction or complex transactions with many moving parts, 60 to 90 days provides more buffer. The additional cost of a longer lock is often worth the peace of mind if the closing timeline is uncertain.

Can I switch loan programs after locking my rate?

Yes, but changing your loan program after locking will typically require a new lock at the pricing for the new program. If you switch from conventional to FHA, or change your down payment amount enough to cross a pricing threshold, the rate from your original lock does not transfer automatically. Discuss any program changes with your loan officer before making them, so you understand the pricing impact.

What is a float-down option on a mortgage rate lock?

A float-down lets you capture a lower rate if market rates drop by a defined amount before your closing date, while still keeping the protection of your locked rate if rates rise. Float-downs typically cost 0.25% to 0.50% of the loan amount as an upfront fee and require rates to fall by a minimum threshold before the lower rate applies. They are worth considering if you have a long closing timeline and believe rates may decrease materially.

Will taking out a new credit card after locking affect my mortgage rate?

Opening a new credit account after locking your rate can affect your mortgage in two ways: the inquiry may lower your credit score by a few points, and the new account changes your debt profile, which can affect your debt-to-income ratio. If either change crosses a pricing threshold, your lender may need to reprice the loan. The safest approach is to hold off on any new credit applications until after your loan closes.

Have questions about protecting your rate through closing? Schedule a discovery call and we will walk through your situation together, no pressure.

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Anthony Ferrando | Ferrando Financial LLC | NMLS# 1919613 | Company NMLS# 2403080 | Licensed in Texas. Equal Housing Lender. This content is for educational purposes only and does not constitute financial, legal, or tax advice. All loans are subject to credit, income, and property qualification. This post does not constitute a commitment to lend. Contact us for current rate and program information.