Mortgage Rate Lock: When to Ask Questions and What to Compare

Jan 21, 2027 · By Oanh Nguyen · Broker & Loan Officer · Home Loans

Mortgage rates can change every day. When you're buying a home, that uncertainty can be stressful. A rate lock helps by holding your interest rate for a set period while your loan moves toward closing.

But rate locks have details that matter: how long they last, what happens if closing is delayed, what extensions cost and whether you can benefit if rates fall.

In this post, I'll explain how rate locks work, the questions to ask and what to compare between lenders. I won't tell you when to lock or predict where rates are going. No one can do that reliably. Instead, I'll help you understand the terms so you can make a decision that fits your timeline and comfort with risk.

This is general education, not a loan offer or commitment to lend. Loan programs, guidelines and eligibility change and depend on lender review and approval. I don't include rate or payment examples in this post.

What a Rate Lock Is

The Consumer Financial Protection Bureau (CFPB) explains that a rate lock means your interest rate won't change between the offer and closing, as long as you close within the specified time frame and there are no changes to your application.

Two key conditions:

1. You close before the lock expires.
2. Your application doesn't change in ways that affect pricing, like your loan amount, credit, income, property value or loan type.

If either changes, your rate may change.

If your rate isn't locked, the CFPB notes, it can change at any time.

Where to Find Your Lock Status

The CFPB says to check the top of page 1 of your Loan Estimate to see whether your rate is locked and for how long. Some lenders lock as part of issuing a Loan Estimate, and some don't. Ask your lender to confirm in writing.

Lock Period

The CFPB notes that rate locks are typically available for 30, 45 or 60 days, and sometimes longer, and that lock policies vary by lender.

Things to consider:

• Your closing date: the lock should cover it, with some cushion for delays.
• Longer locks may cost more or come with a higher rate. Ask your lender.
• Shorter locks may be less expensive but leave less room for delays.

Tip: if you're worried your lock might be too short, the CFPB suggests asking your lender about switching to a longer lock period now, rather than waiting.

Expiration and Extensions

If your closing is delayed past your lock expiration, you may need to extend the lock or relock at current rates.

Ask your lender:

• When exactly does my lock expire?
• What does an extension cost, and how is it calculated?
• How long can I extend?
• Who pays if the delay is caused by the lender, the seller or something else?
• What happens if I can't extend?

Common causes of delays: appraisal timing, loan conditions, title issues, document problems, repair negotiations and holidays. Staying responsive helps prevent delays caused on your side.

Points and Rate Locks

Your lock usually covers both your interest rate and any discount points or lender credits tied to that rate.

• Points are upfront costs you pay to lower your rate.
• Lender credits reduce upfront costs in exchange for a higher rate.

The CFPB explains how points and lender credits work. When you lock, confirm the exact rate and the exact points or credits in writing. My post on comparing Loan Estimates explains where to find these on the form.

Float-Down Options

The CFPB notes a possible downside of a rate lock: it may lock you out of a lower rate if rates fall after you lock.

Some lenders offer a float-down option, which may let you get a lower rate if rates drop during your lock period, under certain conditions.

If a float-down is offered, ask:

• Is there a cost?
• How much do rates need to drop before it applies?
• When and how can I use it?
• How many times can I use it?
• Does it affect my lock period?

Float-down terms vary widely. Read them carefully.

Lining Up the Lock With Your Closing Schedule

Your rate lock and your escrow timeline need to work together.

Before you lock, check:

• Your contract's closing date.
• Contingency deadlines, like appraisal and loan.
• Whether the appraisal is ordered and when it's expected.
• Any repair negotiations that could delay closing.
• Holidays that could slow down lenders, escrow or county offices.

My post on what happens during escrow explains each step.

Changes That Can Affect Your Locked Rate

Because a lock depends on your application staying the same, these changes can affect your rate or pricing:

• Loan amount changes, like a different purchase price or down payment.
• Appraisal comes in differently than expected, changing your loan-to-value.
• Credit changes, like new debt or a lower score.
• Income or employment changes.
• Property type or occupancy changes.
• Switching loan programs.

Tell your lender right away about any change.

Locking Before You're in Contract

Most locks are tied to a specific property and application. But some lenders offer programs that let buyers lock a rate while they're still shopping, sometimes called "lock and shop" programs. Terms, costs and availability vary widely.

If you're considering one, ask:

• What does it cost, and is any of it refundable?
• How long does the lock last?
• What happens if I don't find a home in time?
• What happens if my loan amount or property type changes?
• Can I benefit if rates fall?

Read the terms carefully, and compare them with simply locking once you're in contract.

A Simple Rate Lock Timeline

1. Before shopping: get pre-approved and ask your lender about their lock policies.
2. Offer accepted: confirm your closing date and contingency deadlines.
3. Formal application: receive your Loan Estimate and check page 1 for lock status.
4. Decide when to lock: based on your timeline and comfort with rate changes, not predictions.
5. Confirm in writing: rate, points or credits, lock period and expiration.
6. During escrow: watch for anything that could delay closing.
7. Before expiration: if closing is at risk of slipping, ask about extension options early.
8. Closing Disclosure: confirm the final rate matches your lock.

Keep the Focus on Your Budget

It's natural to want the lowest possible rate. But trying to time the market can lead to stress and missed opportunities. A more reliable approach is to focus on what you can control:

• A payment that fits your budget, even if rates move a little.
• A lock that fits your timeline.
• Strong documentation so your loan closes on time.
• Reserves for unexpected costs.

My post on how rates affect your budget explains how to think about rate changes without predicting them.

What to Compare Between Lenders

Questions to Ask Your Lender

1. Is my rate locked right now? Can you confirm in writing?
2. When does my lock expire?
3. Does my lock period cover my closing date with a cushion?
4. What does an extension cost?
5. Are points or lender credits included in the lock?
6. Do you offer a float-down option, and what are the terms?
7. What changes in my application could change my rate?
8. What happens if closing is delayed by the seller or another party?

Common Mistakes

1. Assuming the rate is locked without written confirmation.
2. Choosing a lock too short for the closing timeline.
3. Not knowing the extension cost.
4. Changing the loan amount or program after locking without understanding the effect.
5. Taking on new debt after locking.
6. Trying to time the market instead of focusing on your budget and timeline.

Key Takeaways

• A rate lock holds your rate if you close on time and your application doesn't change.
• Check page 1 of your Loan Estimate and get lock terms in writing.
• Match the lock period to your closing date, with a cushion.
• Know the extension cost and any float-down terms.
• Report any changes to your lender right away.

A Hypothetical Example

This example is made up to show the process. It is not based on any real borrower, loan or lender, and uses no rates or payments.

A buyer's contract has a closing date about a month after acceptance. The lender offers several lock periods. The buyer chooses a lock that covers the closing date with a cushion, and confirms the rate and points in writing.

During escrow, the seller asks to move closing a week later to finish moving. Because the buyer's lock already had a cushion, no extension is needed. Before agreeing, the buyer checked the lock expiration and asked the lender what an extension would cost, just in case.

Frequently Asked Questions

How I Can Help

As a broker and loan officer, I help buyers understand lock options, match lock periods to their escrow timelines and compare lock terms, extension costs and float-down options. I don't predict rates, but I help you make a decision that fits your plan. Loan approval always depends on lender review and approval.

The Bottom Line

A rate lock gives you certainty, as long as you close on time and your application stays the same. Confirm your lock in writing, match it to your closing date with a cushion, know the extension and float-down terms and tell your lender about any changes.

Wondering about rate lock options? Let's talk through them before you lock.

Sources

• Consumer Financial Protection Bureau, "What's a lock-in or a rate lock on a mortgage?": https://www.consumerfinance.gov/ask-cfpb/whats-a-lock-in-or-a-rate-lock-en-143/
• Consumer Financial Protection Bureau, Loan Estimate explainer: https://www.consumerfinance.gov/owning-a-home/loan-estimate/
• Consumer Financial Protection Bureau, "How should I use lender credits and points?": https://www.consumerfinance.gov/ask-cfpb/what-are-discount-points-and-lender-credits-and-how-do-they-work-en-136/
• Consumer Financial Protection Bureau, Closing on your new home: https://www.consumerfinance.gov/owning-a-home/close/

Ask me about rate lock options. Call or text me at 408-780-1188, or email onrealtygroup@gmail.com.

Oanh Nguyen · Broker & Loan Officer · On Realty Group, brokered by LPT Realty · BRE #02133991 · NMLS 2020335

Equal Housing Opportunity.

Loan disclosure: Oanh Nguyen, Broker | Loan Officer, On Realty Group, brokered by LPT Realty, BRE #02133991, NMLS #2020335. This post is general education, not a loan offer, rate quote or commitment to lend. Loan programs, guidelines and eligibility change and are subject to lender review and approval.

Disclaimer: This post is general information only, not an appraisal or legal, tax or financial advice; data comes from the public sources linked above, is believed reliable but not guaranteed, and can change at any time.