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# Locking in a Mortgage Rate: The Best Day to Do It

May 29, 2026  

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You are at the final stage of getting a mortgage. You have chosen a lender that offers the lowest interest rate, submitted the loan application, and are in the middle of the [pre-approval stage](<https://lbcmortgage.com/blog/mortgage-pre-approval/>). But how can you be sure that the rate value that seems so attractive to you now won’t change overnight and turn into an appalling figure when the contract is lying on the table before you, ready for signing? The only way to do it is to lock in the mortgage rate.

From this article, you will learn why mortgage rates change, what locking in the rate means, and when the right moment to do it comes.

## The Mortgage Rate: Reasons for Volatility Made Plain

A mortgage rate isn't a one-size-fits-all number a lender offers to all and sundry; it is calculated for each customer individually. Moreover, the figure the lender gives you at the outset of the red tape is just an estimate that can eventually go up or down. What causes mortgage rate fluctuations?

- [Economic](<https://lbcmortgage.com/blog/rising-energy-prices-mortgage/>), climatic, and [political factors](<https://lbcmortgage.com/blog/iran-conflict-mortgage-rates/>). Lenders respond to events, natural disasters, and crises worldwide and within the nation, adjusting their mortgage rates accordingly.

- Inflation. High inflation figures drive mortgage rates in their wake.

- [Federal institutions’ policy](<https://lbcmortgage.com/blog/getting-a-better-rate-while-the-fed-waits-and-watches/>). The US Federal Reserve and Federal Funds can’t order mortgage organizations what rate to set, but their policies and decisions have a strong impact on the latter.

- 10-year US Treasury bonds. As a rule, the yields of these securities serve as benchmarks not only for the bond market but also for the mortgage industry.

- Loan type. With a fixed-rate mortgage, the borrower always pays the same amount every month, whereas adjustable mortgage rates are subject to change.

Naturally, as someone about to take out a loan, you would like to [avoid any anxieties and frustrations](<https://lbcmortgage.com/blog/psychology-mortgage-approval-anxiety/>) related to potential mortgage rate fluctuations and safeguard the exact amount by locking it in.

## What a Mortgage Rate Lock Is and How It Is Done

A mortgage rate lock is an official, binding agreement between the borrower and the mortgagee in which the lender promises to keep the rate at a specific level for a certain period (typically, from 30 to 60 days). How do you lock in the rate?

First, you submit a mortgage application and get pre-approved. Then, you choose the right moment to lock in the rate, determine the lock-in period, and sign the contract, where all the details and numbers are stated.

Sounds easy and clear, doesn’t it? Well, it does, until you get down to “the right moment” part. When is the right moment?

## Determining Day D for a Mortgage Rate Lock-in

Now, what is really strange for a novice in the field: mortgage rates are subject not only to fluctuations caused by major events or financial factors. In fact, the day of the week matters also.

So let’s start with the days NOT to be chosen for locking in your mortgage rate. They are Wednesday and Friday. Why? It is on these days that important news usually arrives. Every sixth Wednesday, the Federal Reserve officials meet to discuss their policies. On the first Friday of each month, the Bureau of Labor Statistics publishes its non-farm payroll report. Both events have a huge impact on mortgage rates, which may soar or plummet abruptly.

Of course, the Wednesday or Friday you choose for locking in the rate may not coincide with these vital occasions. But are you ready to track Fridays and Wednesdays to make sure they aren't the momentous ones? To be on the safe side, schedule your locking-in routine for a Monday. No matter whether the Feds make vital decisions on Wednesdays or Fridays, the beginning of a working week is usually a shoulder season for the mortgage market, when nothing special happens.

These are just the assumptions, you may say, what about the statistics? Here is what MBSQuoteLine, the recognized authority in the mortgage realm, says about the indices during the week.

| Day of the Week | Average Basis Point Change |
| --- | --- |
| Monday | 17.3 |
| Tuesday | 20.3 |
| Wednesday | 23.8 |
| Thursday | 20.1 |
| Friday | 23.6 |

[Source](<https://themortgagereports.com/18161/best-day-to-lock-mortgage-rate-data>)

What does it have to do with mortgage rates? 25 basis-point volatility equals a 0.125% change in mortgage rates. These hard numbers are the best proof that timing your mortgage rate lock for the start of the business week is the wisest decision at the end of the day (and that day is Monday!).

If you still have any doubts regarding this – or any other – procedure as part of the loan application and approval, ask [vetted professionals in the industry](<https://lbcmortgage.com/>).

## How LBC Mortgage Can Help You

The most qualified advice and recommendations come from people who know the mortgage domain inside out. LBC Mortgage is where you can find such experts. Our agents and realtors work coast-to-coast – both nationwide and across 10 jurisdictions. Our 18-year presence in the US mortgage market has enabled us to provide homes for thousands of Americans and has given us rich experience, which we are ready to share with you.

[Book a consultation](<https://lbcmortgage.com/contact-us/>) to learn about the mortgage-obtaining pipeline and discover available loan types.

## To Sum It Up

The mortgage rate announced by your lender is a ballpark figure that can fluctuate due to political and economic events, the central government's policies and decisions, Treasury bond yields, and loan type. To make sure you get the most profitable rate, you should lock it in by signing a dedicated agreement with the mortgagee that specifies its value until the loan contract is finalized. The best day to do it is Monday, since the volatility of the financial and mortgage markets is lowest at the start of the business week.

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**Author:** [Alex Shekhtman CEO & Founder, LBC Mortgage](<https://lbcmortgage.com/team/alex-shekhtman/>)

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## Frequently Asked Questions

- ### 1. What are the pros and cons of locking in a mortgage rate?
**

Like many other finance-related operations, mortgage rate lock has both upsides and downsides to it.

The pluses of locking in a mortgage rate include:

- Protection against sudden spikes. The lock acts like insurance. If mortgage rates surge after you submit the loan application but before you close the deal, the rate you agreed upon won’t change.
- Budget predictability. Since you know the exact sum you will have to pay every month, you can plan your other expenses confidently.
- Peace of mind. Owing someone a huge sum is stressful enough without having to monitor financial markets and news constantly for rate dynamics. After locking in the mortgage rate, you will have one less source of stress.

The most significant mortgage rate lock minuses are:

- Missing out on drops. Mortgage rates may not only suddenly rise, but also fall. After the lock, you can’t capitalize on lower rates.
- Time limit. A mortgage lock never lasts longer than two months. If you fail to close the deal during this time, the lock is void, or you will have to pay to extend it.
- Fees. Being officially free, the mortgage rate lock fee is usually added to the rate itself and spread over the payment period, or baked into upfront loan costs.
- Leverage loss. With the rate locked, you can’t negotiate loan conditions or opt for other products if they become available during the lock period.
- ### 2. Can I lose my locked mortgage rate?
**

When you read the mortgage rate lock agreement, you will see a series of conditions in it. If you don’t stick to them, the deal is off. Such conditions include:

- The lock period expiration. The maximum lock-in duration lasts for 60 days (but it may also be 45 or even 30 days). If the deal isn’t closed before the deadline for any reason (title issues, underwriter backups, unverified income documents, appraisal problems), the lock expires. Of course, you may extend it, but it comes at a price (typically, a 7-15 day extension will cost you between 0.125% and 0.375% of the total loan amount).
- Change in your financial metrics. If there is a shift in any of them, the lender can legally declare your lock void and recalibrate your initial mortgage rate. The examples of such changes are: altering your employment or income type, taking a new loan of any kind, accumulating debt on your credit card balance, switching to another loan type (e.g., from [fixed to adjustable](<https://lbcmortgage.com/fixed-adjustable-mortgages/>)), home appraisal discrepancies (when the property’s assessed price is lower than the sum you purchase it for), negative dynamics of your credit score, etc.
- ### 3. When should I lock in a mortgage rate and when should I wait (aka float)?
**

There is no universal recipe that will tell you what to do. Each case should be viewed individually, as it involves several factors.

It is better to lock in your mortgage rate if

- The closing day is approaching. Within 30 days of closing, you should ensure the rate remains unchanged.
- Markets are volatile. If the global or local political and economic situation is precarious, or a tornado season is approaching in your state, locking in your mortgage rate is a safe option.
- Your budget is tight. You have calculated your monthly expenditures and see that you can’t afford to pay more than the current rate. To save your budget from nasty surprises, lock in the rate and have done with it.

Floating is a wiser option if

- There is an obvious downward trend in rates. When all related indicators (government bond markets, Federal Reserve policies, housing forecasts from leading financial institutions and platforms, etc.) are on a steady decline, waiting makes sense.
- There is a long closing window. If your home is under construction and far from being finished, locking in the mortgage rate spells a higher lock-in fee. There is no need to rush to lock in when you still have months before closing the deal.
- The lender offers a float-down option. You can sign an additional agreement that maintains the upward ceiling on the mortgage rate and gives you a one-time opportunity to lower it if the rate drops before closing. While very attractive, this option isn’t free (typically, an upfront fee of $350-500 is required).

On balance, you should consider all these factors before making a decision to lock or not to lock. Anyway, if the rate doesn’t satisfy you after the deal is closed, you can [refinance the mortgage](<https://lbcmortgage.com/how-to-refinance-a-mortgage-a-roadmap-to-follow/>) later.

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