A lender commitment to honor specific mortgage pricing for a defined period.
Rate lock is a lender commitment to honor a specified mortgage rate and related pricing terms for a defined period, assuming the stated conditions of the lock are satisfied.
Rate lock matters because mortgage pricing can move while the borrower is still in the middle of underwriting and closing. Without a lock, a quote that looked manageable at application could worsen before the deal is ready to fund.
At the same time, borrowers should not treat a lock as magic protection against every possible change. Lock terms have deadlines, conditions, and sometimes feature choices such as float-down options or extension costs.
Borrowers deal with rate lock after choosing to move forward with a lender but before closing. The question is when to lock, for how long, and on what terms.
The lock remains important until funding because the lender has committed to a pricing window only for the defined Lock Period. If closing drifts outside that window, the borrower may need an extension or a different pricing outcome.
Behind the scenes, the locked loan may also become part of the lender’s Mortgage Pipeline. That is one reason timing matters: lenders often manage locked-loan exposure through secondary-market tools such as a Pipeline Hedge.
| Lock question | Why it matters |
|---|---|
| Is there a Lock Confirmation? | The borrower needs a record of the actual locked terms, not just a verbal quote |
| How long does the lock last? | The borrower needs enough time to reach closing without losing protection |
| Is there a Rate Lock Fee or Rate Lock Deposit? | The borrower needs to know whether the lock adds cash, deposit, or refund questions |
| Is there a Float Down feature? | Market improvements after locking may or may not help |
| What if the lock reaches Rate Lock Expiration? | A Rate Lock Extension, Relock, or repricing outcome may be required |
| Item | Typical lock effect |
|---|---|
| Note rate | Protected for the stated period if the lock conditions remain satisfied |
| Discount points or lender credits | Protected as part of the accepted pricing package |
| Loan assumptions | Must remain consistent with the locked property, program, amount, occupancy, and borrower scenario |
| Property taxes, insurance, and escrow | Not protected by the mortgage rate lock |
| Closing deadline | Must fit the lock’s expiration and funding requirements |
A material change in loan amount, property type, occupancy, credit profile, product, or closing schedule can affect pricing even while a lock exists. The lock confirmation should identify the scenario on which the commitment is based.
A quote is not automatically locked. Confirm how the lender accepts a lock request, whether any fee or deposit is required, and when written confirmation will be issued. Record the rate, points or credits, loan program, lock date, expiration, and property address.
If a revised Loan Estimate follows, reconcile it with the confirmation rather than relying on a verbal statement that the file is protected.
Before authorizing the lock, record the complete option:
| Lock field | What to confirm |
|---|---|
| Note rate | Exact percentage being protected |
| Points or lender credits | Dollar effect tied to that rate |
| Loan scenario | Amount, product, term, property, occupancy, and down payment |
| Lock window | Start, expiration, time zone, and required closing or funding milestone |
| Special terms | Fee, deposit, float-down, extension, and relock policy |
Also test whether the file is ready for the selected period. A 30-day lock can be poorly matched to a purchase that still needs a contract amendment, appraisal repair, title cure, or unresolved underwriting documentation. A longer lock may cost more, but that known cost can be preferable to an avoidable extension.
Once the request is submitted, treat the loan as floating until the lender confirms acceptance. Save both the request and the final confirmation if their terms differ.
A borrower selects 6.500% with a $1,500 lender credit and a 45-day lock. The written confirmation matches the rate and credit, identifies the property and loan amount, and requires funding before expiration. If market pricing worsens, those confirmed terms remain protected as long as the scenario and deadline conditions are satisfied.
Rate lock differs from Lock Period. The lock is the commitment itself. The lock period is the length of time that commitment lasts.
It also differs from Float Down. Float-down is a specific feature that may allow a borrower to improve pricing after locking if market conditions improve, subject to the lender’s rules.
It also differs from Rate Lock Extension. The original lock is the first pricing commitment. An extension is the later step used when the file needs more time than the original lock allowed.
It also differs from Mortgage Pipeline and Pipeline Hedge. The rate lock is the borrower-facing commitment; pipeline and hedge terms describe how the lender manages many locked loans behind the scenes.