If your mortgage rate lock expires before closing, the lender is no longer bound to the rate you agreed on, and your loan reprices at whatever the market is doing that day. A higher rate means a higher monthly payment, a new round of underwriting to confirm you still qualify, and, if the annual percentage rate shifts far enough, a corrected Closing Disclosure that pushes your closing date back by at least three business days. In a worst case, the new payment knocks your debt-to-income ratio past the lender’s limit and the loan is denied.
The good news is that most of these outcomes are avoidable if you act before the lock lapses, and manageable even if it already has.
What Expiration Actually Means
A rate lock is a lender’s commitment to hold a specific interest rate for a set number of days, usually 30, 45, or 60. Once that window closes, the lender has no legal obligation to honor the original rate. Your loan reprices automatically to current market pricing.
If rates have climbed since you locked, your new rate reflects every basis point of that increase. If rates have dropped, don’t count on catching a break. Most lenders apply worst-case pricing rules that give you the higher of the two rates, specifically to prevent borrowers from letting locks lapse on purpose to chase a better number.
The repricing is only the start. A higher payment forces the underwriting team to re-verify that you still qualify, and if your numbers were tight going in, the ripple effects can be bigger than the rate change itself.
Why Closings Run Past the Lock
Locks rarely expire because a borrower forgot the date. They expire because something upstream slipped. Title problems are among the most common causes: an old lien the seller didn’t know about, a boundary dispute, or a recording error can hold things up for weeks.
Appraisal issues are another frequent trigger. If the home comes in under the purchase price, negotiations over the gap can drag. Underwriting holdups from missing documentation, employment verification delays, or last-minute credit inquiries burn through lock periods faster than most borrowers expect. And sometimes the seller simply isn’t ready to close.
Figuring out which of these is holding up your file matters, because the cause often determines who pays to fix it.
Extend Before the Lock Expires
If closing is slipping but the lock is still active, request an extension from your lender in writing, usually through email or a secure loan portal. Do it before the expiration date. Once the lock lapses, you’re no longer extending anything; you’re re-locking, which is a different and more expensive process.
Extensions typically come in 15-day increments and cost between 0.125% and 0.25% of the loan amount per increment. On a $400,000 mortgage, that’s $500 to $1,000 for each 15 days. Some lenders use flat fees instead. The Consumer Financial Protection Bureau notes that Loan Estimates do not disclose what an extension would cost, so you have to ask directly.
Your lender will want a reason for the delay and a realistic new closing date. A clear answer backed by specifics from your real estate agent or title company makes approval faster.
Who Pays the Extension Fee
This depends on who caused the delay. When the holdup is the lender’s own, whether slow underwriting, a lost document, or a processing backlog, the lender should cover the fee. Industry practice puts the cost on the responsible party, and most lenders will absorb it for short extensions when the problem originated on their side.
If the seller caused the delay, say by needing more time to vacate or to clear a title defect, you can negotiate for the seller to reimburse the extension cost. Nothing requires the seller to agree; it’s a matter of leverage and how badly both sides want the deal to close.
When no one is clearly at fault, or when your own paperwork is the holdup, you’re probably paying. Even then, ask. Some lenders will waive or reduce the fee for a strong borrower as a goodwill gesture.
If the Lock Has Already Expired
Once the lock is gone, you’re in re-lock territory. Most lenders apply worst-case pricing: your new rate is whichever is higher between your original locked rate and the current market rate, plus a re-lock fee on top. The fee typically runs 0.125% to 0.250% of the loan principal, which is another $500 to $1,000 on a $400,000 loan.
Some lenders also impose waiting periods. One major lender requires borrowers who unlock to float to wait at least 14 calendar days before re-locking at current market rates and terms; re-locking inside that window keeps the original rate, while re-locking after it means accepting whatever the market offers. Policies vary significantly, so ask about the specific re-lock rules your lender uses before you need them.
Downstream Effects on Closing and Approval
A rate change after expiration is not just a payment problem. It can push your closing date back and, in close cases, cost you the loan.
Revised Disclosures and a New Waiting Period
Federal regulations require the lender to issue a corrected Closing Disclosure if the APR changes beyond a specified tolerance. For standard fixed-rate mortgages with regular payment schedules, that tolerance is one-eighth of one percentage point (0.125%). For loans with irregular features like multiple advances or variable payment amounts, the tolerance widens to one-quarter of one percentage point (0.25%).
When a corrected Closing Disclosure goes out, you must receive it at least three business days before the loan can close. That waiting period cannot be waived. Even a small APR change can push your closing back by nearly a week once you count delivery time and business days.
Debt-to-Income Recalculation
A higher payment means the underwriter has to re-run the ratios to confirm you still qualify. A rate increase of even half a percentage point on a $400,000 loan adds roughly $120 per month, which can be enough to tip a borrower who was already close to the DTI ceiling.
If the recalculated ratio pushes past the lender’s threshold, the lender has to re-underwrite. That can mean requiring a larger down payment to shrink the loan balance, or a flat denial if the income simply can’t support the new payment.
Risk to the Purchase Contract
If the loan collapses because of a rate-lock-related qualification failure, the real estate contract may collapse with it. Depending on the contract terms, you could lose your earnest money deposit or face other penalties for failing to close on time.
Switching Lenders
If the re-lock terms are bad enough, you’re free to move the loan to another lender. There’s no contractual obligation to stay. A competitor offering a better rate might save you more than paying re-lock fees on an expired commitment.
The catch is time. A new lender starts from scratch: new application, potentially a new appraisal, new title work, new disclosures. That can add weeks. Switching only works if your purchase contract has enough slack or the seller agrees to extend. In a market where the seller has backup offers, this path carries real risk.
Float-Down Options
A float-down provision is an add-on to a standard rate lock that lets you capture a lower rate if the market drops before closing, while still protecting you from increases. Float-downs typically cost between 0.25% and 1% of the loan amount, paid upfront or rolled into closing costs, and most require rates to drop by a minimum amount (often 0.25%) before you can exercise.
This is a forward-looking tool, not a rescue for an expired lock. Ask about trigger thresholds and exercise deadlines when you first lock, not after rates have already moved.
Keeping It From Happening Again
The borrowers who get burned are almost always the ones who assumed the closing timeline would go smoothly without building in any margin. A few habits reduce the risk substantially:
- Match the lock period to a realistic timeline, not an optimistic one. If 30 days is “probably enough,” 45 days is often worth the small added cost.
- Return document requests the day they arrive. Underwriting delays caused by missing paperwork are the delays you actually control.
- Track the expiration date yourself. Set reminders two weeks and one week out so you can push for a status update instead of hoping for one.
- Ask your lender upfront what happens if closing is delayed and the lock expires. The CFPB specifically recommends this question before you commit.
- If you see closing slipping, submit the extension request with days to spare, not hours. A request filed before expiration is almost always cheaper and easier than dealing with a lapsed lock.
A little planning, and a willingness to pay for a slightly longer lock period, can save thousands in re-lock fees, higher rates, and in the worst cases, a deal that falls apart entirely.