How Do Pre-Approvals Work? Documents, Letter, and Denials

Mortgage pre-approval works like this: a lender reviews verified documentation of your income, assets, debts, and credit, then issues a conditional letter stating the maximum loan amount they’re willing to give you, the loan type, and an estimated interest rate. Most letters stay valid for 30 to 90 days.¹ Because the lender has actually checked your paperwork rather than trusting what you told them, a pre-approval letter carries real weight with sellers in a competitive market.

Pre-Approval Is Not the Same as Pre-Qualification

A pre-qualification is an early estimate based mostly on numbers you report yourself. It often skips document verification and sometimes skips the credit check entirely. Pre-approval requires you to hand over the actual documents so the lender can confirm your finances firsthand.²

One catch: lenders don’t use these labels consistently. Some call their verified process a “pre-qualification.” The CFPB’s advice is to ignore the word and ask what the lender actually does. Do they verify your documents? Do they pull your credit? A letter built on verified information carries more weight with sellers regardless of what the lender chose to call it.²

What You Need Before You Apply

Missing paperwork is one of the most common reasons a pre-approval stalls. Gather these before you start.

Income

Expect to provide W-2 forms and federal tax returns from the past two years. You’ll also need recent pay stubs. Fannie Mae’s selling guide requires at least one pay stub dated within 30 days of your application, though many lenders ask for the last two months.³⁴

Self-employed borrowers carry a heavier documentation load: personal tax returns, year-to-date profit and loss statements, business tax returns, and Schedule K-1 forms if you own part of a partnership or S-corporation. The lender may also request tax return transcripts directly from the IRS using Form 4506-C to confirm what you submitted.⁵

Assets and Debts

Plan on two months of recent statements for every checking, savings, and investment account. The lender is checking that you have enough for the down payment, closing costs, and reserves after closing.⁴ Closing costs generally run 2% to 5% of the loan amount, on top of the down payment.⁶

You’ll also disclose every existing debt: car loans, student loans, credit card balances, and any other monthly obligation. The lender uses this alongside your income to compute your debt-to-income ratio. There’s no single federal ceiling, but most conventional lenders look for a DTI below roughly 43% to 50%, depending on the rest of your file.

Credit Score

Minimums depend on the loan program. Conventional loans backed by Fannie Mae require a FICO score of at least 620 for a fixed-rate mortgage and 640 for an adjustable-rate mortgage.⁷ FHA loans allow 580 with a 3.5% down payment, or 500 with 10% down.⁸ VA loans set no minimum at the agency level, though individual lenders usually impose their own.

Pull your own credit reports first through AnnualCreditReport.com, the only site federally authorized to provide free annual reports from all three bureaus. Catching an account that isn’t yours or a wrongly reported late payment before the lender does saves you a scramble later.⁹

What the Lender Does With Your File

You submit the application through the lender’s portal or with a loan officer. The lender pulls your full credit report, which counts as a hard inquiry and can drop your score by up to five points temporarily.¹⁰

Underwriters then match your documentation against the requirements of the specific loan program. Automated underwriting systems produce initial findings quickly for straightforward files. More complicated situations, such as self-employment income, multiple income streams, or a recent job change, often trigger manual review. If the underwriter needs an explanation for a specific bank deposit or a line on your tax return, they’ll ask. Answering fast keeps the file moving.

You Can Shop Around Without Extra Credit Damage

Compare more than one lender. The credit scoring system already anticipates this: all mortgage-related credit inquiries within a 45-day window count as a single inquiry. You can collect several pre-approval letters and only take one hit on your score.¹¹

What the Letter Actually Says

The pre-approval letter states the maximum loan amount, identifies the loan type (say, a 30-year fixed or a 5-year ARM), and shows an estimated interest rate based on your credit profile and current market conditions.

That rate is not locked. Mortgage rates move daily, and a rate lock generally doesn’t happen until you have an accepted offer on a specific property and receive a formal Loan Estimate. The rate on your pre-approval letter can drift up or down until then.¹²

Every letter carries an expiration date. The CFPB notes 30 to 60 days is common, with some lenders going up to 90.¹ After expiration, the lender re-pulls your credit and updates your income documentation before reissuing. Some letters also include conditions on the property, such as restrictions on condos or multi-unit buildings.

Down Payment Requirements Shape the Approved Amount

How much you need down depends on the loan program, and it directly influences how big a loan you can qualify for.

Conventional loans usually require at least 3% down for first-time buyers through programs like Fannie Mae’s HomeReady or the 97% loan-to-value option. Repeat buyers generally need at least 5%.¹³
FHA loans require 3.5% down at a 580 credit score, or 10% between 500 and 579.⁸
VA-backed purchase loans for eligible veterans and active-duty service members require no down payment, as long as the sale price does not exceed the appraised value.¹⁴

What You Can and Cannot Be Charged

Federal rules limit what a lender can charge before you receive a Loan Estimate and tell them you want to proceed. Before that point, the only allowed fee is a reasonable charge for pulling your credit report.¹⁵ A lender cannot charge application, appraisal, or underwriting fees just to issue a pre-approval letter. Ask upfront whether the credit report fee is passed on to you or absorbed by the lender.

Keeping Your Pre-Approval From Falling Apart

The letter reflects a snapshot of your finances on a specific day. Change the snapshot significantly, and the lender can revoke the pre-approval or shrink the number.

Don’t Take On New Debt

A new credit card, a financed car, or a big purchase on existing credit pushes up your debt-to-income ratio and adds inquiries. The CFPB specifically warns against applying for new credit right before or during the mortgage process, since inquiries outside the mortgage-shopping window can lower your score.¹¹ Drain your cash reserves on a major purchase, and the lender may decide you no longer meet liquidity requirements.

Don’t Change Jobs If You Can Help It

Lenders want stable, verifiable income. Switching from a salaried role to commission or self-employment is especially disruptive, because those income types generally need a two-year track record before they fully count. A job change mid-process can force a re-evaluation or push closing back.

Expect a Second Credit Check Before Closing

Most lenders run a soft credit pull shortly before closing to see whether you’ve taken on new debt since applying. If undisclosed debts push your DTI up by three or more percentage points, the lender may re-underwrite the whole loan. That can change your terms, cut your approved amount, or lead to a denial.¹⁶

If You Are Denied

Federal law requires the lender to tell you why. Under the Equal Credit Opportunity Act, they must send a written adverse action notice within 30 days that spells out the specific reasons. Vague explanations like “you didn’t meet our internal standards” don’t satisfy the rule.¹⁷

Common causes include a DTI ratio that’s too high, thin cash reserves, a credit score below the program floor, or an incomplete application. Self-employed borrowers sometimes get denied because aggressive tax deductions leave their reported income too low for the loan they asked for.

A denial isn’t permanent. Treat the reasons in the adverse action notice as a task list. Pay down debt to bring the DTI down, dispute errors on your credit report, build savings, or lengthen your income history. When the underlying issue is fixed, you can reapply with the same lender or a different one.

1
Consumer Financial Protection Bureau. Get a Preapproval Letter
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Consumer Financial Protection Bureau. Prequalification Letter vs Preapproval Letter
3
Fannie Mae Selling Guide. Standards for Employment Documentation
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Fannie Mae. Documents You Need to Apply for a Mortgage
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Fannie Mae Selling Guide. Requirements and Uses of IRS IVES Request for Transcript of Tax Return Form 4506-C
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Fannie Mae. Closing Costs Calculator
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Fannie Mae Selling Guide. General Requirements for Credit Scores
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HUD.gov. FHA Single Family Origination Trends
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Annual Credit Report.com. Home Page
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U.S. Small Business Administration. Credit Inquiries: What You Should Know About Hard and Soft Pulls
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Consumer Financial Protection Bureau. What Happens When a Mortgage Lender Checks My Credit
12
Consumer Financial Protection Bureau. What Is a Lock-In or a Rate Lock on a Mortgage
13
Fannie Mae. What You Need to Know About Down Payments
14
U.S. Department of Veterans Affairs. Purchase Loan
15
Consumer Financial Protection Bureau. 1026.19 Certain Mortgage and Variable-Rate Transactions
16
Fannie Mae Selling Guide. B1-1-01 Contents of the Application Package
17
Consumer Financial Protection Bureau. Regulation B – 1002.9 Notifications