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Guide

What Is a Mortgage Rate Lock and How It Works

How a CFPB rate lock holds a quoted interest rate to closing if the file and timeline stay the same. Education, not a lock offer.

Published: 2026-09-14

Key takeaways

  • The CFPB says a lock-in means the interest rate will not change between the offer and closing if you close in the stated window and the application does not change.
  • Rate locks are typically available for 30, 45, or 60 days, and sometimes longer. An unlocked rate can change at any time, including the same day.
  • A locked rate can still change if the loan amount, credit score, income documentation, down payment, or product changes, or if the appraisal comes in higher or lower than expected.
  • The Loan Estimate shows whether the rate is locked and for how long. It does not show the cost to extend, or what a shorter or longer lock would have cost.

Published: 2026-09-14

A rate lock is a time-limited agreement about the interest rate on one application. It is not a promise that market averages will sit still, and it is not a closing guarantee.

The CFPB defines it this way: "A lock-in or rate lock on a mortgage loan means that 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." HomeMortgageOnline does not lock rates.

What does a lock actually hold?

The CFPB notes that mortgage interest rates can change daily, sometimes hourly. If the rate is locked, it stays put through closing only if you finish on time and the file stays the same. If the rate is not locked, it can change at any time.

Typical lock windows the bureau lists are 30, 45, or 60 days, and sometimes longer. A longer window can cost more. A short window can expire if the appraisal, title, or underwriting runs long.

Check the top of page 1 of the Loan Estimate. The CFPB says that box states whether the rate is locked and for how long. Some lenders lock when they issue the estimate. Some do not.

When can a locked rate still change?

The CFPB lists common file changes that can reopen pricing even after a lock:

  • You change the loan type or the down payment.
  • The appraisal comes in higher or lower than expected.
  • Your credit score changes because you opened new credit or missed a payment.
  • The lender cannot document overtime, bonus, or other income.

A lock is a snapshot of one application. Change the snapshot and the lender can reprice. That is not the same as the market moving. Both can happen in the same week.

What questions does the CFPB tell you to ask?

Rate-lock policies vary by lender. The bureau's list includes: what a lock today means, what time frame the Loan Estimate uses, whether a shorter or longer lock is available and at what cost, what happens if closing is delayed, which file changes can still move the rate, and what happens if market rates later sit lower.

The CFPB also states a downside in plain language: extending a lock can be expensive, and a lock "may lock you out of a lower interest rate if rates fall after you get your loan offer." That is a description of the contract, not a market forecast.

The Loan Estimate will not show the price of an extension or the price of a different window. Ask those numbers in writing. Then compare APR and cash to close using the points and APR guide.

How does a lock fit the rest of the file?

A lock is not an approval. Underwriting can still decline the loan. A lock is also not a float-down unless the lender's written policy says so. Ask whether a float-down exists, what it costs, and what triggers it.

If the closing date is uncertain, the CFPB says to consider a longer lock now rather than hoping a short one can be extended later. If you are still shopping lenders, lock terms belong on the same worksheet as points and fees. See how mortgage rates are determined for why unlocked quotes move during the day.

Rate note: nothing on this page is a lock offer, a guaranteed APR, or advice to lock or float. Written lock agreements from licensed lenders are the documents that control.

Disclaimer: this guide is for general education. HomeMortgageOnline is not a lender, broker, or loan originator. It does not take applications, lock rates, or give financial advice. Real offers vary by credit, down payment, loan type, points, fees, and market conditions.

Sources

  1. Consumer Financial Protection Bureau, What's a lock-in or a rate lock on a mortgage? (last reviewed May 2, 2023) - https://www.consumerfinance.gov/ask-cfpb/whats-a-lock-in-or-a-rate-lock-en-143/
  2. Consumer Financial Protection Bureau, What is a Loan Estimate? - https://www.consumerfinance.gov/ask-cfpb/what-is-a-loan-estimate-en-1995/
  3. Consumer Financial Protection Bureau, What is the difference between a mortgage interest rate and an APR? - https://www.consumerfinance.gov/ask-cfpb/what-is-the-difference-between-a-mortgage-interest-rate-and-an-apr-en-135/

Frequently asked questions

What is a mortgage rate lock?

The CFPB says a lock means the interest rate will not change between the offer and closing if you close in the stated period and the application does not change. Typical windows are 30, 45, or 60 days. An unlocked rate can change at any time. A lock is not an approval.

Can a locked mortgage rate still change?

Yes. The CFPB says a locked rate can still change if you alter the loan type or down payment, if the appraisal differs from expectations, if your credit score changes, or if income cannot be documented. A lock holds one application, not every possible file change.

Where do I see if my rate is locked?

The CFPB says to check the top of page 1 of the Loan Estimate. That box states whether the rate is locked and for how long. The form does not show extension cost or the price of a different lock window. Ask the lender for those figures in writing.

What happens if my rate lock expires?

If you miss the window, the CFPB notes that an extension can be expensive. Some lenders reprice at current terms. Ask before you lock what a delay costs and whether a longer initial window is available. This site does not extend or sell locks.

Should I lock or wait because rates might move?

This site does not advise lock or float. The CFPB describes lock-versus-float as a trade: a lock can reduce uncertainty and can also keep you from a later lower offer if the market moves. Compare written lock terms. Nothing here predicts the next move in rates.