Underwriting and appraisal
Mortgage underwriting: what the underwriter checks and how to help
Underwriting is where a lender confirms everything you told it. It can feel like an endless list of requests, but each one maps to a rule. Knowing the rules lets you answer once, completely, and keep your closing date.
Reviewed November 2026 · Written for Buy Home Tips from the sources listed below
Underwriting is the lender's review of your loan file to decide whether it meets the program's rules and the lender's own standards. The CFPB lists submitting documents for underwriting, and answering the lender's requests, among the main tasks after your offer is accepted. Some files go through an automated system first, with a human underwriter reviewing the documents and conditions.
The four areas
1. Credit. The underwriter reviews your credit reports and scores, payment history, and any new accounts or inquiries since you applied.
2. Income and employment. Pay stubs, W-2s, tax returns and verification of employment confirm what you earn and whether it is likely to continue. The result feeds into your debt-to-income ratio, which must fit the program's limits, such as Fannie Mae's 36, 45 or 50 percent maximums depending on how the loan is underwritten.
3. Assets. Bank and investment statements show the money for the down payment, closing costs and any required reserves. Unverified funds cannot be used. Fannie Mae defines a large deposit as a single deposit over 50 percent of total monthly qualifying income, and lenders must evaluate large deposits when bank statements are used.
4. The property. The appraisal confirms value and condition; title work confirms the seller can transfer clear ownership. Condos also need project review.
Conditional approval and the conditions list
Many files receive a conditional approval: the loan is approved if certain items are provided or confirmed. Typical conditions include a missing page of a bank statement, an explanation for a deposit, a final pay stub, proof of homeowners insurance or a gift letter. Each condition must be cleared before the file reaches clear to close.
What slows underwriting down
- Partial documents. Lenders usually need every page of each statement, even blank ones.
- New credit. A financed couch or car can change your ratio and require re-review.
- Job changes. A new job, pay type or hours can require new verification.
- Moving money. Shifting funds between accounts creates new paper trails to document.
- Appraisal surprises. A low value or required repairs can change the loan terms or the deal.
How to make it smooth
Keep a single folder of everything you send, labeled with dates. Respond fast and completely. If a request seems unreasonable, ask your loan officer which rule it relates to; the answer often reveals exactly what the underwriter needs. And keep your financial life boring until you have the keys.
If the answer is no
A lender that denies your application must tell you, and you can ask what would need to change. Sometimes the fix is a different loan program, a larger down payment, paying down a debt or simply waiting for more income history. Ask for specifics before you apply elsewhere, so the next application starts from a stronger file rather than repeating the same problem.
Mini calculator: your debt-to-income ratios
Lenders divide monthly debt payments by gross monthly income. See your housing-only ratio and your total ratio with a proposed payment.
Limits differ by loan type and lender. A ratio a lender accepts can still be uncomfortable for your household.
During underwriting
- Answer every request in full, with all pages of each statement.
- Write a short, signed note for any large or unusual deposit, with proof.
- Do not open new credit, finance purchases or co-sign anything.
- Do not change jobs or pay structure without telling your lender first.
- Keep the down payment money where the lender has already seen it.
- Respond to requests the same day if you can.
Questions buyers ask
What does a mortgage underwriter look at?
Your credit history, income and employment, assets for the down payment, closing costs and reserves, and the property through the appraisal and title work, all measured against the loan program's rules.
How long does mortgage underwriting take?
It varies by lender, loan type and how quickly you respond. Ask your lender for its current timeline and plan your contract deadlines around it.
Why is my lender asking about deposits?
Lenders must verify where your funds come from. Fannie Mae defines a large deposit as a single deposit over 50 percent of your total monthly qualifying income and requires lenders to evaluate large deposits on purchase loans when bank statements are used.
Will my lender check my credit again before closing?
Many lenders do. The CFPB notes that applying for other credit adds inquiries that can lower your scores, so avoid new credit until after closing.
Sources checked for this page
- Fannie Mae Selling Guide B3-4.2-02: depository accounts and large deposits
- Fannie Mae Selling Guide B3-6-02: debt-to-income ratios
- CFPB: what happens when a mortgage lender checks my credit
- CFPB: closing on your new home
Checked November 2026. Programs and limits change; confirm with the source before you rely on a figure.