A loan lock (rate lock) is a lender’s written promise to give a borrower a specified mortgage interest rate, and to hold that rate for an agreed period of time (the lock period). Rate locks protect borrowers from rising interest rates between the time they apply/agree to buy and the loan closing, but they can carry costs (fees or a slightly higher rate) and rules about extensions, float‑downs, and changes to the loan application. (Sources: Investopedia; CFPB)
Key takeaways
– A rate lock guarantees a specific interest rate for a set period (commonly 30, 45 or 60 days).
– Locks protect borrowers from rate increases during the lock period but can prevent taking advantage of falling rates unless a float‑down option is purchased.
– Locks may be free or come with a fee or a rate premium; extensions and float‑downs typically cost extra.
– A loan lock is different from a loan commitment; a commitment may or may not include a rate lock. (Sources: Investopedia; CFPB)
How a loan lock works
– Quote and option: When you apply for a mortgage or go under contract, a lender will quote a rate based on current market rates plus the lender’s margin. That quoted rate is not guaranteed until you request a lock and the lender confirms it.
– Lock agreement: The lender issues a rate‑lock confirmation that should state the interest rate, lock period (start and expiration dates), loan program details, costs (if any), and any conditions (e.g., borrower credit score, loan-to-value).
– During the lock: If market rates rise, your locked rate remains in effect through the lock expiration. If market rates fall, you generally cannot take the lower rate unless your lock includes a float‑down option.
– Expiration/extension: If your lock expires before closing you may have to re‑lock at the current market rate, and lenders often charge to extend locks or re‑price the loan. (Sources: Investopedia; CFPB)
Loan lock vs. loan commitment
– Loan lock: specifically guarantees an interest rate for a specified period (applies to mortgage loans).
– Loan commitment: a lender’s written promise to lend a specified amount under stated conditions; it may or may not include a rate lock. In competitive housing markets, buyers sometimes provide a loan commitment to sellers to strengthen an offer—ask whether that commitment includes a rate lock. (Source: Investopedia)
Is it better to lock or to wait?
Consider these factors:
– How far along is the transaction? If you’re under contract and closing is scheduled within a timeframe covered by a typical lock (30–60 days), locking usually makes sense to avoid rate risk.
– Market outlook and risk tolerance: If you expect rates to fall and are willing to risk them rising in the meantime, you might float. If you prefer predictable payments, lock.
– Cost/availability of float‑down options: If you worry about missing a lower rate, see whether your lender offers a float‑down for a fee or as part of a no‑cost lock. (Sources: Investopedia; CFPB)
Practical example (impact of a rate change)
– On a $300,000, 30‑year fixed mortgage:
• At 3.00% annual interest, monthly principal & interest ≈ $1,265.
• At 3.50% annual interest, monthly principal & interest ≈ $1,346.
• Difference ≈ $80 per month (illustrative to show how a 0.5% change affects payments). This is why a rate lock can matter financially.
What are the disadvantages of a loan lock?
– Missed opportunity: If rates fall during the lock period you may be stuck at the higher rate unless you purchased a float‑down.
– Extension costs: If your closing is delayed past the lock, extensions can be expensive.
– Upfront fees or higher rate: Some lenders charge a lock fee or add a margin to the quoted rate.
– Conditions and fallout risk: Locks often rely on conditions (income, credit score, property); if those change or the borrower withdraws, lenders face fallout risk. (Source: Investopedia)
How long can a lender lock in a rate?
– Typical lock durations: 30, 45, or 60 days. Lenders also offer shorter (a few days) or longer (90 days or more) locks—longer locks usually cost more or require a higher locked rate. For new construction or delayed closings, longer locks are available but commonly at higher cost or with larger lender requirements. (Source: Investopedia)
Practical steps and checklist for borrowers
1. Time it to your contract: If you’re under contract to buy, aim to lock once you have an approved loan estimate and a realistic closing date within the lock window.
2. Get the lock in writing: Request a written lock confirmation showing rate, points, lock start and expiration dates, any fees, whether a float‑down or extension is available, and exactly which loan terms are covered.
3. Ask about costs and options:
• Is the lock free or is there a fee?
• Does the lock include points? If so, are they paid at closing or upfront?
• Is a float‑down option available? What does it cost and when can it be used?
• How much does an extension cost and how long can you extend?
4. Understand the conditions: Confirm the lock applies only if your credit profile, income, property, and loan details remain as represented. Ask what would void the lock.
5. Coordinate timing with closing: Communicate with your lender, title company, and realtor to avoid avoidable delays that force a lock extension.
6. Monitor but don’t overreact: If rates fall, discuss float‑down options. If rates rise, celebrate your locked protection. Either way, keep decisions aligned with your risk tolerance.
7. Maintain your financial profile: Don’t open new credit lines, make large purchases, or change jobs during processing—these can affect loan approval and potentially void the lock.
8. If the lock expires: Contact your lender immediately to discuss re‑locking options and costs; if the market moved in your favor you might re‑lock at a lower rate, but if not you may need to accept the higher rate or renegotiate terms. (Sources: Investopedia; CFPB)
Sample language to request from your lender
– “Please provide a written rate‑lock confirmation with: the locked interest rate, number of points, lock start and expiration dates, fees (if any), whether a float‑down is available and its cost, and the terms/conditions that could void this lock.”
Common questions (brief)
– Can I change lenders after locking? Yes, but your lock applies to that lender and cannot be transferred; switching lenders means starting new quotes and locks.
– Does the lock include closing costs? No—locks guarantee the interest rate, not lender fees or third‑party closing costs unless specified.
– Can the lender change the locked rate? Only if the lock agreement allows or if a borrower-requested change (e.g., different loan product) invalidates the original lock.
The bottom line
A loan lock gives borrowers predictability by guaranteeing a mortgage interest rate for a set time, protecting against rising rates. The tradeoffs are potential fees, limited ability to benefit from falling rates (without a paid float‑down), and the risk of costly extensions if closing is delayed. Before locking, get written confirmation of all terms, understand the costs and conditions, and coordinate timing to minimize the need for extensions. (Sources: Investopedia; CFPB)
Sources
– Investopedia. “Loan Lock.”
– Consumer Financial Protection Bureau (CFPB). “What’s a lock‑in or a rate lock on a mortgage?” /
– review a sample lock confirmation and highlight key elements to watch for, or
– estimate how much different lock lengths or a float‑down would cost using a particular loan amount and rate scenario. Which would help you most?