Mortgage Pre-Approval: What Lenders Check and What the Letter Means

What a mortgage pre-approval actually is

A mortgage pre-approval is a lender’s conditional indication of how much it may lend you, based on a review of your finances. The depth of that review varies by lender. The output is a pre-approval letter you can hand to a listing agent with an offer. It is not final loan approval. Ask which information the lender has verified before you rely on it.

For a buyer about to start touring, the letter does three things: it helps you estimate a price range, it signals to sellers that a lender has already looked at your file, and it surfaces problems (self-employment income math, an old collection, a large undocumented deposit) while you still have time to fix them.

Pre-qualification, pre-approval, and underwritten pre-approval

These three terms are not interchangeable, and lenders use them inconsistently. Ask what you are actually getting.

Pre-qualification. Often a quick estimate based on information you state over the phone or online. Credit checks and verification vary by lender. It can help with an early affordability check.

Pre-approval. The lender typically checks credit and may review pay stubs, W-2s, bank statements, and other documentation. Some lenders also run an automated underwriting system (AUS). Ask whether the letter reflects verified documents or information you supplied, and confirm the loan amount and program it covers.

Underwritten pre-approval (also called credit-approved or TBD-underwrite). A human underwriter reviews the file before you have a property under contract. Conditions can include appraisal, title, homeowners insurance, updated financial documents, and confirmation that your financial situation has not materially changed. Ask for the outstanding conditions in writing. Availability and timing vary by lender.

What lenders check for mortgage pre-approval

For mortgage pre-approval, the lender checks your credit, income, and assets against the rules of a specific loan program. Five pieces drive the decision.

Credit score and credit report

For a Fannie Mae loan, the lender generally obtains a merged report from Equifax, Experian, and TransUnion. With three scores, Fannie Mae uses each borrower’s middle score and then the lowest applicable borrower score as the representative score for pricing. Eligibility rules can differ, particularly for manual underwriting. The lender also reviews your payment history, debts, and recent inquiries.

Minimum scores depend on the program and lender. Fannie Mae does not set a minimum score for Desktop Underwriter (DU) loan casefiles, but that does not eliminate credit review or lender requirements. FHA permits maximum purchase financing with a score of at least 580, generally allowing 3.5% down on the property’s adjusted value. Scores from 500 through 579 limit financing to 90% of the property’s adjusted value, generally requiring at least 10% down. Other eligibility rules still apply, and lenders can set stricter requirements.

Credit score models. Fannie Mae and Freddie Mac now accept VantageScore 4.0 alongside Classic FICO. The limited rollout began April 22, 2026, and expanded to all approved lenders using automated underwriting on September 9, 2026. Fannie’s manual underwriting still requires Classic FICO. FHA will accept VantageScore 4.0 and FICO 10T on case numbers assigned on or after January 1, 2027 (Mortgagee Letter 2026-11). Ask your lender which model it uses. A score you see in a consumer app may differ from the score used for your mortgage.

Debt-to-income ratio

DTI is your total qualifying monthly obligations divided by qualifying gross monthly income. The housing payment includes principal, interest, property taxes, homeowners insurance, and applicable mortgage insurance and association dues. Other obligations can include credit cards, student loans, auto loans, and support payments.

Limits vary by program and underwriting method. For example, Fannie Mae generally allows up to 36% total DTI with manual underwriting, or up to 45% when specified credit and reserve requirements are met. DU permits up to 50%, subject to its overall assessment and applicable loan requirements. These ceilings do not guarantee approval.

If your car loan has 10 or fewer payments left, ask whether it can be excluded. Fannie Mae still requires the payment to count if it significantly affects your ability to meet credit obligations. Car lease payments count regardless of how soon the lease ends.

Income and employment

For mortgage pre-approval, expect requests for recent pay stubs showing year-to-date earnings and W-2s. Fannie Mae requires one or two years of W-2s depending on the income type; verification services can sometimes replace paper documents. Employment is checked again near closing.

For bonus, overtime, or commission income, Fannie Mae recommends a two-year history but can accept at least 12 months with supporting factors. The lender compares current earnings with prior years. Declining income must have stabilized to be eligible, and the calculation uses the stabilized income level.

Self-employed borrowers should prepare two years of personal tax returns and, when applicable, business returns. Some files qualify with one year of returns. The lender may request a year-to-date profit and loss statement. Qualifying income comes from a cash-flow analysis of the business and tax returns, with permitted adjustments.

For a hypothetical sole proprietor with $150,000 in annual gross receipts and $60,000 in deductible business expenses, net profit is $90,000. That is a starting figure, not an approved qualifying income amount. The lender still evaluates adjustments, income history, and stability. See calculating self-employed income for a mortgage for the method lenders use.

Assets and large deposits

The lender needs to see the funds for your down payment, closing costs, and required reserves. For a Fannie Mae purchase loan documented with bank statements, expect the most recent two months, or the most recent quarter for quarterly statements. Other verification methods may be available. A single deposit exceeding 50% of total monthly qualifying income is a large deposit under Fannie Mae rules. If those funds are needed for the purchase, their source must be acceptable and documented; an unsourced amount may have to be excluded. Clearly identified payroll or transfers between verified accounts generally need no further explanation. See large deposits on a mortgage application.

Gift funds may be allowed, depending on the loan, property, and donor. Fannie Mae requires a donor-signed gift letter stating that repayment is not expected, plus evidence that sufficient funds are in the donor’s account or have been transferred. Gifts can also go directly to the closing agent. See the dos and don’ts of getting your down payment as a gift.

AUS findings

A lender may use Fannie Mae’s DU or Freddie Mac’s Loan Product Advisor (LPA) for conventional loans. Automated findings can call for approval, additional review, or a different underwriting path. They do not replace the lender’s obligation to verify the file. Ask which system was used, what recommendation it returned, and which conditions remain.

Documents to gather for mortgage pre-approval

Use this as a preparation list, then ask your lender which items your file needs. Requirements and turnaround times vary.

• Government-issued photo ID.
• Social Security number (for the credit pull).
• Recent pay stubs showing year-to-date earnings.
• W-2s for the last two years to prepare for a possible request. If self-employed, personal and applicable business tax returns, plus a year-to-date profit and loss statement if requested.
• Recent complete statements for accounts you will use for the down payment or reserves. Ask how many months are required and whether quarterly statements are acceptable.
• Documentation for any large or unusual deposit.
• Signed gift letter and the lender’s requested evidence of gift funds and transfer.
• Divorce decree, child support order, or bankruptcy discharge if applicable.
• For a VA loan, a Certificate of Eligibility and any service records the lender requests.
• A written letter of explanation if the lender requests one for a credit event, employment gap, or unusual deposit.

Credit pulls and the rate-shopping window

Ask whether the lender uses a soft or hard credit inquiry for pre-approval and when a hard inquiry will be needed. A hard inquiry can affect your score. Rate-shopping treatment depends on the scoring model.

The CFPB says inquiries for the same type of loan within 14 to 45 days generally receive single-inquiry treatment for scoring. FICO specifies 14 days for older versions and 45 days for newer versions. The inquiries can still appear separately on your credit report. Concentrating mortgage applications within 14 days helps accommodate the shorter FICO window; it does not guarantee that your score will stay unchanged.

For most purchase mortgages, the lender must provide a Loan Estimate within three business days after receiving your name, income, Social Security number, property address, estimated property value, and requested loan amount. Supporting documents are not required to trigger that deadline. Compare Loan Estimates using the same loan type, amount, and rate-lock assumptions to assess rates, lender charges, and estimated cash to close. A pre-approval letter alone does not show you the rate, fees, and cash to close in a form you can compare.

How long a mortgage pre-approval letter lasts

The lender sets the letter’s expiration date. The CFPB describes 30 to 60 days as typical, but terms vary. Check the letter and ask what is required to renew it. Document-age requirements are a separate issue.

Fannie Mae’s Selling Guide (section B1-1-03) requires credit documents, including the credit report, pay stubs, bank statements, and verifications of employment, to be no more than four months old on the note date. For consecutive statements, Fannie Mae measures age using the most recent one. Separate employment-verification timing rules also apply. If you are still shopping when documents age out, the lender must obtain updates. A later hard credit inquiry may be outside your scoring model’s shopping window and can affect your score.

While touring homes, follow the letter’s stated expiration date, keep new pay stubs and bank statements available, and tell your loan officer when you go under contract.

What can cancel a pre-approval between the letter and closing

Mortgage pre-approval is not a guarantee. These are the common reasons a file falls apart before closing.

• Opening new credit. A new car loan, a furniture financing plan, or a new credit card can push DTI over the limit or drop the score below the program minimum. Do not finance anything until after closing.
• Missing a payment on any existing account.
• Changing jobs, especially from salaried to commissioned or self-employed. Ask the loan officer how a job change would affect your file before you make it.
• Large undocumented deposits. Keep documentation for deposits into accounts you will use for the purchase.
• Co-signing a loan. The obligation may count in your DTI, even if someone else plans to pay it.
• A rate increase that changes the payment enough to push DTI over the ceiling.
• Appraisal or title problems on the specific property. These are property issues, not borrower issues, but they can kill the loan.

How to use the letter when you make an offer

Work with your real estate agent to include the mortgage pre-approval letter with an offer. Confirm that its loan amount, down payment, and any stated purchase price match the financing in your offer. The loan amount can be below the offer price because your down payment covers part of the price. Ask whether the lender can tailor the letter to that offer without showing your full borrowing limit.

A letter can show that you are a serious buyer, but it does not guarantee that a seller will accept your offer. Ask your agent how to present your financing and discuss any financing contingency before submitting the offer.

You are not committed to the lender that issued the letter. Once you are under contract, request Loan Estimates from two or three lenders and compare them. Compare the proposed terms and costs before choosing a lender. Ask separately whether the lender offers a rate lock while you shop.

Next step

If you are ready to tour homes, start by estimating a price range with a lender, then collect the document list above before you call a lender. If you are not sure what payment you can carry, work through can I afford to buy a home first. Then request mortgage pre-approvals from two or three lenders inside a 14-day window to fit the shorter FICO shopping window, and compare the Loan Estimates when you are under contract.