The difference between a loan commitment and a loan approval comes down to how far the lender has gone. A loan approval, usually delivered as a pre-approval letter, means the lender has looked at your credit and income and thinks you qualify for a mortgage of a certain size. A loan commitment is the lender’s written promise to actually fund a specific loan, issued after underwriting has reviewed both you and the property. Sellers, agents, and closing attorneys treat the two documents very differently, and the gap between them is where most financing timelines succeed or fail.
What Loan Approval Actually Covers
Approval is a spectrum, not a single event. It starts with pre-qualification, where you share basic financial details and get a rough borrowing estimate with no credit pull and no verification. Pre-approval goes further. The lender runs a hard credit inquiry, pulls reports from Equifax, Experian, and TransUnion, and reviews pay stubs, W-2s, and bank statements. The tri-merge report produces a median credit score, which becomes the benchmark for your interest rate and eligibility.
At this stage the lender also looks at your debt-to-income ratio. Under current federal Qualified Mortgage rules there is no hard DTI cap; the CFPB replaced the former 43% ceiling with a pricing-based test that measures how much a loan’s annual percentage rate exceeds the average prime offer rate for a comparable transaction.1Consumer Financial Protection Bureau. Consumer Financial Protection Bureau Issues Two Final Rules to Promote Access to Responsible, Affordable Mortgage Credit Most lenders still apply internal DTI guidelines in the neighborhood of 43% to 50%. Federal rules also require lenders to make a good-faith determination that you can repay, which includes verifying income and assets through third-party records.2eCFR. 12 CFR 1026.43
A pre-approval letter tells a seller you’ve been vetted on paper. It is not a guarantee. The lender has not examined the property, has not completed full underwriting, and has not committed to specific loan terms. The message is closer to “we’re probably in” than “we’re definitely in.”
What a Loan Commitment Means
A loan commitment letter is the lender’s written promise to fund your mortgage under specific terms. By the time you receive one, the lender has completed full underwriting on both you and the property. Your income has been verified, the appraisal has been reviewed, the title search has come back clean, and the underwriter has signed off. The letter states the loan amount, the interest rate, the loan-to-value ratio, and an expiration date, typically 30 to 60 days out.
Most commitment letters are conditional. A handful of items still need to be completed before closing: final verification of employment, confirmation that no new debt has appeared, proof of homeowners insurance, and so on. A final or “clear” commitment means every condition has been satisfied and the file is ready for closing. The distinction matters because a conditional commitment can still fall apart if you miss a listed condition or your financial situation shifts before the closing date.
Even in its conditional form, a commitment letter carries real legal weight. It is a binding contract. If the lender walks away without a valid reason after issuing the commitment, you may have grounds for a breach-of-contract claim. The conditions written into the letter, however, give the lender legitimate exit ramps, so it is not a blank-check guarantee: material changes to your creditworthiness or the property’s value can justify withdrawal.
Why the Difference Matters When You’re Buying
When you submit an offer, the seller wants to know your financing is real. A pre-approval shows you have been vetted on paper, but experienced sellers and listing agents know it does not guarantee closing. A commitment letter tells them a lender has already done the deep work and is prepared to fund. In a multiple-offer situation, the buyer with a commitment in hand has a meaningful edge.
Timing matters too. Purchase agreements typically include a financing contingency with a deadline. If you cannot secure a commitment by that date, the seller can walk away and keep the property on the market. Confusing pre-approval with commitment, and assuming you’re further along than you are, is one of the most common ways deals collapse.
What It Takes to Move From Approval to Commitment
Getting from approval to commitment means clearing every item the underwriter needs to close the file. The requirements fall into two buckets: documents about you and documents about the property.
On the borrower side, expect to provide pay stubs covering the most recent 30 days, recent tax returns or W-2s, and bank statements showing the funds for your down payment and closing costs. Many lenders also request IRS tax transcripts through the Income Verification Express Service to cross-check what you reported on your application against what you actually filed.3Internal Revenue Service. Income Verification Express Service for Taxpayers
On the property side, the lender orders a professional appraisal to confirm the home’s market value supports the loan amount.4Fannie Mae. Appraisers and Property Underwriting A title search checks for liens, unpaid taxes, or other claims that could cloud ownership. You’ll also need a homeowners insurance binder showing coverage for at least the replacement cost of the structure. The lender will not issue a commitment until all of these pieces are in the file and reviewed.
If the appraisal comes in below the purchase price, the lender will only lend based on the appraised value. That gap becomes yours to close, whether by renegotiating with the seller, bringing extra cash to the table, disputing the appraisal, or exercising an appraisal contingency to walk away.
Protecting the Commitment Between Issuance and Closing
More loans die between commitment and closing than most buyers realize. Lenders typically run a final credit pull and verify employment right before funding, so anything that changes your financial profile can sink the deal at the last minute.
The mistakes that most often cause problems in this window:
- Opening new credit. A new card or car loan triggers a hard inquiry and adds debt, and either can shift your DTI enough to disqualify you.
- Making large purchases. Furniture, appliances, or a car can drain cash reserves or add a monthly payment.
- Changing jobs. New employment disrupts income verification. If a change is unavoidable, tell your lender before it happens.
- Large unexplained deposits. A lump sum in your account has to be traced, and if you can’t document the source clearly, it delays or kills closing.
- Closing existing accounts. Shutting a credit card can lower your available credit and drop your score, even when you’re trying to simplify things.
The safest posture is to change nothing between commitment and closing. Keep your accounts, your employment, and your spending exactly where they were when the underwriter said yes.
The interest rate in your commitment is usually locked for 30 to 60 days. If closing slips past the lock expiration, you’ll either pay to extend, accept the current market rate, or float. Extensions commonly run 0.125% to 0.375% of the loan amount per 15 days, which works out to roughly $500 to $1,500 on a $400,000 mortgage. If the delay is the lender’s fault they should waive the fee, though you’ll likely need to ask. Delays caused by the seller or a slow title company are harder to get waived.
If the Lender Denies You After Approval
A pre-approval or even a conditional commitment can still end in denial. When it does, federal law requires the lender to tell you why. Under the Equal Credit Opportunity Act, the lender must send an adverse action notice within 30 days of its decision on a completed application, and the notice must state the specific reasons for the denial or inform you of your right to request them.5Consumer Financial Protection Bureau. 12 CFR 1002.9 – Notifications
Common denial reasons at the commitment stage include a failed appraisal, unresolved title issues, a material change in employment or credit, or commitment conditions that were never satisfied before the letter expired. If you believe the denial was based on a protected characteristic rather than a financial factor, you can file a complaint with the Consumer Financial Protection Bureau.