Mortgage Underwriting Process: 7 Things Lenders Review Before Final Approval

Preapproval feels like the finish line. It isn’t. Once your full file lands with an underwriter, a much more detailed review starts. The process goes beyond the credit score and income numbers your loan officer already checked. This stage is called mortgage underwriting, where lenders take a closer look at your entire loan file to confirm that your financial information meets their requirements.

What do mortgage underwriters look at during mortgage underwriting? Mortgage underwriters review your credit history, income, debts, assets, property details, and documents to determine whether your loan meets lender guidelines. This detailed review helps lenders confirm your financial information before final approval.

Here are seven things underwriters review and why each one can affect your final loan decision, even after your preapproval looks solid.

The score is a summary. Underwriters read the details behind it: how recent any late payments are, whether they were isolated or a pattern, and whether anything serious like a bankruptcy or foreclosure shows up.

Major derogatory events may involve waiting periods before a borrower may qualify again, depending on the loan program:

Event	Common Conventional Guideline	Common FHA Guideline
Chapter 7 bankruptcy	4 years	2 years
Chapter 13 bankruptcy	2 years from discharge	1 year of on-time payments, with court approval
Foreclosure	7 years	3 years
Short sale	4 years	3 years

These are general guideline waiting periods and may vary by lender, loan program, borrower circumstances, and other factors. They do not constitute an offer of credit.

Many lenders review your two-year employment history, including job stability, income consistency, and employment gaps. Employment details are typically verified through documentation and, when applicable, employer verification rather than only the information provided on your application.

Self-employed and 1099 borrowers may need additional documentation because lenders verify income differently than traditional employees. Depending on the loan program, lenders may review tax returns, business records, or other income documentation instead of relying only on pay stubs.

You may have already estimated your own DTI. Underwriters recalculate it using their own rules, and it doesn’t always match what you expected. Every debt on your credit report gets counted, sometimes including obligations you’d mentally written off as settled or minor.

For illustration, if a borrower qualifies using a 45% DTI threshold, earns $7,000 monthly, and has $380 in other monthly debt, approximately $2,770 would remain for housing expenses. That number only holds if nothing new shows up on your credit report between preapproval and closing, which is exactly why Thing 7 below matters.

Actual DTI limits vary by loan type, lender requirements, and borrower qualifications.

Having enough money in the bank isn’t enough. Underwriters want to know where it came from, and any large, unexplained deposit gets flagged. Large deposits that appear unusual compared with your normal account activity may need to be sourced and documented.

FHA borrowers may have additional documentation requirements depending on their loan situation. You can review FHA loan requirements and borrower resources from HUD for more information.

For example, a lender may request documentation for a deposit that appears unusual compared with your normal account activity. Even legitimate funds, such as a bonus, gift, or asset sale proceeds, may require documentation showing where the money came from.

This is a general guideline threshold and may vary by lender and loan program. It does not constitute an offer of credit.

Underwriters review the appraisal report to confirm the property’s value and ensure it meets applicable loan requirements. They also review whether the property satisfies basic safety and habitability standards.

A home with deferred maintenance, safety issues, or a value that doesn’t line up with similar recent sales nearby can hold up approval even when your personal financial file is spotless.

Before your loan closes, a title search confirms the seller can legally transfer the property and identifies potential issues such as liens, unresolved judgments, or ownership claims. This happens in the background, but a title problem can delay or derail a closing just as easily as a credit issue can.

This is the step that catches people off guard the most. Underwriters commonly re-verify your employment and re-check your credit before closing, depending on lender procedures. If you’ve opened a new credit card, financed a car, or taken on other debt since your initial approval, those changes may affect your debt-to-income ratio and loan qualification.

A common recommendation is to avoid major financial changes, such as opening new credit accounts, financing large purchases, or changing jobs, until after closing.

Does a large deposit always cause a problem?

No, most large deposits clear review just fine once documented. The issue isn’t the deposit itself, it’s the lack of a paper trail. A clear bank statement, gift letter, or sale record usually resolves it quickly.

Can I buy furniture or a car before closing if I’m paying cash, not financing?

Paying cash usually does not change your credit report or DTI, but it may reduce the assets or reserves documented in your loan file. When in doubt, ask your loan officer before making any large purchase until after closing.

How much does one new purchase affect DTI during mortgage underwriting?

It depends on the size of the new payment and your existing ceiling. On the $7,000 income example above, the $2,770 housing capacity assumed no new debt. A new $300 monthly car payment would increase your monthly debt obligations and could affect your qualifying ratio, potentially enough to affect approval on a loan that was already close to the ceiling.

This is an illustrative estimate only and does not constitute an offer of credit.

None of these seven things are designed to trip you up. They’re designed to confirm the file matches reality, which is exactly why staying financially steady between preapproval and closing matters as much as your original application.

Contact Duc Pham or the Wonder Rates team to review what underwriters typically look for before closing and help you prepare your loan file.

All information is for educational purposes only and does not constitute an offer of credit or a commitment to lend. Guidelines, waiting periods, and documentation requirements vary by lender, loan program, and borrower circumstances and are subject to change. Consult your loan officer for guidance specific to your situation.

Duc Pham, Mortgage Broker | NMLS# 844897 | Wonder Rates, Inc. | NMLS# 1518655 | DRE# 02047445 | DFPI# 60DBO-59134 | Equal Housing Opportunity. Equal Housing Lender. | Licensed in: AL, AZ, CA, CO, FL, GA, LA, MI, NC, OH, OK, OR, PA, SC, TX, VA, WA.