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Mortgage interest rates play a major role in determining how affordable your home loan will be, not just monthly, but over the long term. Even a small shift in rates can change your monthly payment and significantly impact the total interest you pay over 15 or 30 years. Because rates move based on economic conditions, inflation, and market activity, they can fluctuate daily.
For buyers and homeowners in the middle of the loan process, this creates uncertainty. You might receive a favorable rate when you apply, only to see market rates rise before your closing date. Since most mortgages take several weeks to finalize, there’s a window of time where changes in the market can affect your loan terms. That’s why understanding how rate protection works is an important part of navigating the mortgage process confidently.
Let’s break down what a mortgage rate lock is, how it works, and whether it’s the right move for you.
What Is a Mortgage Rate Lock?
A mortgage rate lock is an agreement between you and your lender that secures a specific interest rate for a set period of time while your loan is being processed. Once your rate is locked, it will not increase during the agreed lock period, even if market rates rise.
The lock lasts between 15 and 60 days, depending on your lender and how long your loan is expected to take to close. As long as your loan closes before the lock expires and there are no major changes to your application, the locked rate remains in place.
Check out: 5 Factors That Affect Mortgage Rates
How Does a Mortgage Rate Lock Work?
After you submit your mortgage application and supporting documents, the lender reviews your financial details and offers a rate based on your credit score, loan type, loan amount, and current market conditions.
At that stage, you can choose to lock the rate. Your lender will confirm the locked rate and the expiration date of the lock period. From there, your loan moves through underwriting, appraisal, and final approval while your interest rate remains protected from market increases.
If your closing is delayed beyond the lock expiration date, you may need to extend the lock, which could involve additional cost. If you choose not to extend it, your rate may adjust to current market levels when higher, but do not adjust down. At altgage, we do not charge for lock extensions up to 15 days to provide our clients with additional peace of mind.
Must Remember
- Your loan must close before the lock period ends to keep the secured rate.
- Longer lock periods come with higher discount points because your lender is locking up capital at a fixed rate for a longer amount of time.
Example: When Rates Go Up
Imagine you’re purchasing a home with a $400,000 loan and you’re offered a 6.25% interest rate. You decide to lock that rate for 30 days.
Two weeks later, market rates increase to 6.75%. Because you locked your rate, you’re protected from that increase. Without the lock, your monthly payment could have risen significantly, potentially costing you thousands more over the life of the loan.
In this case, the rate lock acts like financial insurance against rising rates.
Example: When Rates Go Down
Now consider a different scenario. You lock your rate at 6.25%, but a week later, rates drop to 6.00%. In most cases, your locked rate remains 6.25%.
Some lenders offer a “float-down” option that may allow you to adjust to a lower rate, but this depends on lender policies. Without that option, you keep the original locked rate. Adding the optionality of a float-down requires an in-built option price that makes lenders less competitive.
Note: Planning to get a mortgage but don’t know where to start? Here is a complete Mortgage Checklist
Mortgage Rate Lock – Pros and Cons
When should you lock your Rate a Good Idea?
Locking your mortgage rate provides stability and protects you from sudden rate increases. However, it also means you’re committed to that rate for the agreed period. The real decision is when to lock based on market conditions, your timeline, and your comfort level with risk.
15-45 days before - 30 is ideal
Once you're under contract, and ideally after condition approval by an underwriter
Process steps
At altgage, we typically recommend locking at least two weeks before your expected closing date, but no more than 45 days before the close of escrow, with 30 days being ideal. A 30-day lock gives you some flexibility while allowing for delays in a 2-3 week close. If closing is 30 days, you still have the altgage protecting of a 15-day no-cost extension. Rates should ideally be locked in before any expected market turbulence, such as an upcoming Fed meeting. Markets tend to bake in mortgage price movements before the announcement and react overtly to even the slightest negative news.
Why should you lock your rate
A locked rate gives you peace of mind, and locking a good rate when rates move slightly lower is 3 times less painful psychologically than when rates move higher. We like to think, “If you like it, lock it,” and don’t hold out for better rates. Buying a home is a stressful endeavor. A rate lock offers a guarantee.
