Can Your Interest Rate Change After Pre-Approval?

Yes, your interest rate can change after pre-approval. The rate printed on a pre-approval letter is a snapshot of what the lender was offering the day it ran your numbers, not a commitment, and it can move up or down before you close based on the market, your finances, and the property you choose. Pre-approval letters are typically valid for only 30 to 60 days, and the rate becomes a firm commitment only when you lock it on a specific property.¹

Why the Pre-Approval Rate Isn’t a Promise

A pre-approval letter tells you how much a lender is tentatively willing to lend based on your income, debts, assets, and credit history.¹ Any rate mentioned in that letter carries no legal commitment. Under federal rules, lenders must provide a formal Loan Estimate within three business days of receiving your application, but a complete application requires a specific property address, an estimate of the property’s value, the loan amount you’re seeking, and your Social Security number.² At the pre-approval stage, those details are missing, so the quoted rate has nothing to hold it in place.

How Market Conditions Shift Your Rate

Mortgage rates move daily, sometimes hourly, in response to economic forces that have nothing to do with your personal finances. Lenders generally price long-term mortgages relative to the yield on the 10-year U.S. Treasury bond. When inflation rises or economic data comes in stronger than expected, investors demand higher returns on Treasury bonds, and mortgage rates climb in response. Weaker data or falling inflation tends to pull rates down. In early 2026, for example, the inflation rate dropped from 2.7% to 2.4%, and 30-year mortgage rates declined modestly in the same period.³

None of these market shifts depend on anything an individual borrower does. They simply reflect changing conditions between the day you were pre-approved and the day you lock or close.

When Your Own Finances Change the Rate

Your pre-approval rate was based on a specific financial snapshot: your credit score, income, debts, and employment. If any of those change before closing, your rate can change too. Lenders typically run your credit a second time just before closing to confirm your financial picture hasn’t deteriorated.

A higher credit score generally qualifies you for a lower rate; a lower score pushes you into more expensive pricing.⁴ Even a modest drop can trigger a Loan-Level Price Adjustment, an additional cost that Fannie Mae and Freddie Mac apply based on factors like credit score, loan-to-value ratio, and property type.⁵ Those adjustments reach the borrower as a higher rate or added fees.

Common moves that can hurt your rate between pre-approval and closing:

Opening new credit accounts. A new credit card or auto loan increases your total debt and can lower your credit score.
Changing jobs, especially from salaried to commission-based or self-employed income, which raises questions about income stability.
Making large purchases on credit, which pushes up your debt-to-income ratio.
Missing payments. Even one late payment on an existing account can drop your score significantly.

The simplest way to protect the rate you were quoted is to keep your financial profile as stable as possible until closing. Avoid new debts, stay in your current job, and hold off on large financial moves until after you have the keys.

How the Property Itself Affects Your Rate

A pre-approval evaluates you as a borrower, but the final rate also depends on the property. Different property types carry different levels of risk for lenders, and that risk gets priced in.

Fannie Mae’s LLPA matrix shows how property type affects pricing. On a purchase loan, a condominium can add up to 0.75% to your cost compared with a single-family detached home, a two-to-four-unit property can add up to 0.625%, and a manufactured home adds 0.50% across most loan-to-value ranges.⁵ Investment properties and second homes also carry higher rates than primary residences because they represent greater default risk.

The appraisal matters too. If the home appraises for less than the purchase price, your loan-to-value ratio rises, which can trigger private mortgage insurance requirements or push you into a higher pricing tier.⁶ None of these property-specific factors are known during pre-approval.

Locking In Your Rate

A rate lock is the only way to turn a quoted rate into a guaranteed one. When you lock, the lender agrees to hold that interest rate for a set period, typically 30, 45, or 60 days, regardless of what happens in the broader market during that window.⁷ You generally need a signed purchase agreement on a specific property before a lender will offer one.

A lock protects you from market increases, but not from every kind of change. Your locked rate can still move if your credit score drops, the appraisal comes in unexpectedly high or low, or your income can’t be verified as originally documented.⁷

Lock Duration and Cost

Longer lock periods generally cost more than shorter ones because the lender takes on more risk that rates will move during the window.⁸ Some lenders absorb the cost of a standard 30-day lock; others charge a fee or offer a slightly higher rate for longer periods. Make sure your lock is long enough to cover a realistic timeline to closing.

What Happens When a Lock Expires

If closing is delayed past the lock expiration date, you have two options: accept the current market rate, which could be higher or lower, or pay a fee to extend the lock. Extension fees vary by lender and loan size but can range from roughly 0.25% to as much as 1% of the loan amount. In many cases the extension fee applies only when the borrower caused the delay; when the lender caused it, most will extend without charge. Ask up front what an extension would cost and who bears responsibility for different types of delays.⁷

Float-Down Options

A standard rate lock protects you if rates go up but doesn’t help if rates fall after you lock. A float-down option addresses that gap. You lock as usual, and if market rates drop before closing, you can request that the lender lower your locked rate to reflect the improvement.⁸ Float-downs aren’t free or automatic. You typically need to request the option when you lock, and lenders charge an additional fee, often structured as a small percentage of the loan amount or a slightly higher initial rate. The float-down also won’t activate unless rates drop by a minimum amount specified by the lender. Not every lender offers this feature, so ask about availability and cost before committing to a standard lock, especially in a period of rate volatility.

Using Discount Points to Lower a Higher Rate

If the rate available at closing is higher than you’d like, you may be able to buy it down by paying discount points. One point equals 1% of your loan amount; one point on a $300,000 loan costs $3,000. You pay points at closing, and in return, the lender reduces your interest rate.⁹

Points make the most sense if you plan to keep the loan for a long time, because the monthly savings need enough time to exceed the upfront cost. You can also buy fractional points, so you’re not locked into a full-point purchase.⁹ If your rate has climbed since pre-approval and you have cash available, points give you a way to offset some or all of the increase.

Federal Protections When the Rate Changes Late

Federal rules under the TILA-RESPA Integrated Disclosure framework provide some safeguards when rates change before closing. If the annual percentage rate on your Closing Disclosure increases enough to become inaccurate under Regulation Z tolerances, the lender must provide a corrected Closing Disclosure and wait at least three business days before closing the loan.¹⁰ The same three-day reset applies if the loan product type changes or if a prepayment penalty is added.

If the rate goes down, the lender can deliver the corrected Closing Disclosure at closing without triggering a new waiting period, because an overstated APR resulting from a rate decrease is not considered inaccurate under the regulation.¹⁰ These rules don’t prevent rate changes; they ensure you get advance notice and time to review before closing on different terms than you expected.

Shop Multiple Lenders

One of the most effective ways to protect yourself from an unfavorable rate is to compare offers from several lenders. Credit scoring models treat all mortgage-related credit checks within a 45-day window as a single inquiry, so shopping around has no additional impact on your score.¹¹

Getting multiple pre-approvals and Loan Estimates lets you compare not just rates but also closing costs, lender fees, and lock terms. If one lender’s rate has moved since your pre-approval, another may offer more competitive pricing on the same day, and a competing offer often gives you leverage to negotiate.

1
Consumer Financial Protection Bureau. Get a Preapproval Letter
2
Consumer Financial Protection Bureau. Regulation Z 1026.19 – Certain Mortgage and Variable-Rate Transactions
3
Freddie Mac. Primary Mortgage Market Survey
4
Consumer Financial Protection Bureau. Does My Credit Score Affect My Ability to Get a Mortgage Loan or the Mortgage Rate I Pay
5
Fannie Mae. LLPA Matrix – Fannie Mae Single Family
6
Consumer Financial Protection Bureau. What Is a Loan-to-Value Ratio and How Does It Relate to My Costs
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Consumer Financial Protection Bureau. What’s a Lock-In or a Rate Lock on a Mortgage
8
My Home by Freddie Mac. Why You Should Consider a Rate Lock-In
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Consumer Financial Protection Bureau. How to Use Lender Credits and Points
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Consumer Financial Protection Bureau. TILA-RESPA Integrated Disclosure FAQs
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Consumer Financial Protection Bureau. What Happens When a Mortgage Lender Checks My Credit