A mortgage rate lock is a promise from your lender to hold a specific interest rate for a set number of days while your loan is processed. It sounds simple, but the questions that cost buyers money are not “should I lock?” They are “for how long, at what cost, and what happens if my closing slips?” This guide explains how a rate lock works, what can still change after you lock, and what to ask before you commit.
What a rate lock does (and does not) do
According to the Consumer Financial Protection Bureau (CFPB), mortgage rates can change daily, sometimes hourly. If your rate is locked, it will not change between the day you lock and closing, as long as you close within the lock period and nothing in your application changes. If your rate is not locked, it can move at any time. Locks are typically offered for 30, 45 or 60 days, and sometimes longer.
The CFPB also notes two downsides: a lock can be expensive to extend if your transaction needs more time, and it can keep you from a lower rate if the market falls after you lock. Neither is a reason to avoid locking, but both are reasons to choose the length and terms on purpose.
Is your rate already locked? Check the Loan Estimate
Some lenders lock your rate when they issue your Loan Estimate and some do not. The CFPB says to look at the top of page 1 of the Loan Estimate: it states whether the rate is locked and for how long. It will not tell you what the lock costs, what an extension would cost, or whether a different lock length would be cheaper or more expensive. Those answers have to come from your loan officer, in writing.
What can change your rate even after you lock
A locked rate is tied to the application you submitted. The CFPB lists common reasons the rate can still change:
- You change the loan type, loan amount or down payment.
- The appraisal comes in higher or lower than expected.
- Your credit score changes, for example because you opened a new account or missed a payment.
- Your lender cannot document income such as overtime or bonuses.
The practical lesson: after you lock, avoid new credit, keep paying every account on time, and do not change jobs or move money around without talking to your loan officer first. Our guides on how debt-to-income ratio is calculated and pre-approval versus pre-qualification explain why these details matter.
Choosing a lock length for a Florida purchase
The right length depends on how long your file realistically needs, not on the lowest advertised rate. Longer locks can cost more, and shorter locks risk expiring. For a Florida purchase, think through the steps that most often run long:
- Appraisal and any repair requests. If the value comes in low or the appraiser requires repairs, the timeline can stretch.
- Homeowners insurance. Your lender needs proof of coverage before closing, and older roofs and older systems can make coverage harder to place. Starting early with an insurance quote for a Florida home keeps this off your critical path.
- Inspection items. Some Florida loans or insurers want a 4-point or wind mitigation report. Scheduling that with a licensed inspector, such as the team at Quality Real Estate Inspections, early in the option period prevents last-minute delays.
- Title, HOA and condo documents. Condo questionnaires and association paperwork often arrive late.
If your contract has a closing date 30 days out but your file has several of these moving parts, ask whether a 45-day lock is available and what it costs compared with a 30-day lock plus a possible extension.
Lock now, float, or ask about a float-down?
“Floating” means leaving the rate unlocked and accepting the risk it can rise or fall. Nobody can reliably predict rate movements, so this is a risk decision, not a strategy to chase. If a payment increase would put your approval or budget at risk, locking removes that risk. If you have room in your budget, some borrowers float for a short time, but the CFPB is clear that an unlocked rate can change at any time.
Some lenders offer a “float-down” option that lets you take a lower rate if the market improves. Policies and fees vary by lender, so treat it as a question to ask rather than something to assume.
Rate lock and the rest of your costs
A lower rate is only part of the picture. Points, lender credits and fees change the real cost of a loan; see discount points versus lender credits and our breakdown of Florida closing costs, doc stamps and intangible tax. If you pay points to get a particular rate, make sure the Loan Estimate reflects that rate and that the lock covers the full period. Your monthly payment also includes taxes and insurance through escrow, covered in how mortgage escrow works in Florida.
Questions to ask your loan officer before you lock
These come straight from the CFPB’s suggested questions:
- What does it mean if I lock my rate today?
- What lock time frame does this Loan Estimate provide?
- Is a shorter or longer lock available, and at what cost?
- What if my closing is delayed and the lock expires?
- Are there any conditions under which my rate could still change?
- If I lock and rates go down, what happens?
Get the lock confirmation, including the lock date, expiration date and rate, in writing. If you are still deciding who to borrow from, compare Loan Estimates from more than one lender; the buyer-side process is described by Quality Real Estate Services.
Frequently asked questions
How long is a typical rate lock?
The CFPB says locks are typically available for 30, 45 or 60 days, and sometimes longer. Availability and cost vary by lender.
Can my locked rate still change?
Yes, if your application changes: loan type, loan amount, down payment, credit score, verified income, or an appraisal result that differs from what was expected.
What happens if my lock expires before closing?
That depends on your lender’s policy. Extensions can be expensive, so ask about the cost and conditions before you lock.
Does a lock appear on my Loan Estimate?
The Loan Estimate shows whether your rate is locked and for how long, but not what the lock or an extension costs.
Is a longer lock always better?
No. It can cost more. Match the lock to a realistic closing timeline for your specific file.
This article is educational and is not a rate quote or a commitment to lend. Rates and terms vary by borrower and lender. Sources: Consumer Financial Protection Bureau, “What’s a lock-in or a rate lock on a mortgage?”
By Tariq AbouAdma, NMLS #2724176 | Loan Factory NMLS #320841. Questions about timing your lock? Call 407-476-6667, or visit our contact page. Quality Real Estate Finance LLC, 336 Wilshire Blvd, Suite 274-229, Casselberry, FL 32707. Equal Housing Opportunity.