Mortgage underwriting requirements come down to five things a lender checks before approving your loan: your income, your credit, your existing debts, your cash and reserves, and the property itself. Each one has specific thresholds, and those thresholds shift depending on whether you’re applying for a conventional, FHA, or VA loan. Meeting them means approval. Missing one usually means a conditional approval with extra paperwork, or a denial with a written explanation of what went wrong.
Income and Employment You Can Document
Underwriters qualify you on gross monthly income, not take-home pay, so the number that matters is bigger than what lands in your account. Lenders typically ask for the two most recent years of W-2s and federal tax returns, plus pay stubs covering at least the last 30 days.1WeStreet Credit Union. Required Documents for Mortgage Applications Those pay stubs need to line up with your W-2s. Mismatches trigger follow-up questions and delay the file.
Most lenders want a two-year work history. Gaps aren’t automatic disqualifiers if you can document the reason and show stable current employment. Bonus, overtime, and commission income generally needs a two-year track record before it counts toward qualifying, though Fannie Mae allows income received for at least 12 months when other factors are strong.2Fannie Mae. Bonus, Commission, Overtime, and Tip Income That’s the rule that catches borrowers who just moved into a commission-heavy role.
Your lender will also verify your tax data directly with the IRS. You sign Form 4506-C, which authorizes the lender to pull transcripts through the Income Verification Express Service.3Internal Revenue Service. Form 4506-C IVES Request for Transcript of Tax Return It’s a consent form, not something you submit yourself.
Self-Employed Applicants
Self-employment brings more documentation. Fannie Mae generally requires a two-year history of self-employment, verified through both personal and business federal tax returns with all schedules attached.4Fannie Mae. Underwriting Factors and Documentation for a Self-Employed Borrower Underwriters analyze year-over-year trends in revenue, expenses, and taxable income. A business trending down is a warning sign even when the current numbers look fine.
Less than two years self-employed? You may still qualify if your most recent return shows a full 12 months of self-employment income and you have prior experience in the same field. A one-year tax return option also exists for businesses that have been in operation at least five years with 25% or more borrower ownership throughout.4Fannie Mae. Underwriting Factors and Documentation for a Self-Employed Borrower Using business funds for the down payment triggers additional requests, like current business statements or a balance sheet showing the withdrawal won’t hurt the company.
Non-Taxable Income
Income from Social Security disability, certain veterans’ benefits, or child support can be “grossed up” because it isn’t taxed. For FHA loans, the gross-up factor is 25% if you don’t file a federal return; otherwise the lender uses your actual tax rate from the most recent return.5HUD. HUD Handbook 4155.1 – Non-Taxable and Projected Income The adjustment can meaningfully improve your qualifying ratio.
Credit Score Minimums
Your credit report shows payment history, credit utilization, length of history, and any derogatory marks like collections, charge-offs, or bankruptcies. The Fair Credit Reporting Act governs how bureaus collect and share this information with lenders.6Office of the Law Revision Counsel. 15 USC 1681 – Congressional Findings and Statement of Purpose
For years, 620 was the hard floor for conventional loans. As of November 2025, Fannie Mae removed the minimum credit score requirement for loans submitted through its Desktop Underwriter system, replacing it with a broader risk analysis.7Fannie Mae. Selling Guide Announcement SEL-2025-09 A very low score won’t suddenly get approved, but the system now weighs your full profile rather than rejecting the file at the door. Manually underwritten conventional loans still carry minimum score requirements that vary by loan type.
FHA is more forgiving. Scores of 580 or above qualify with 3.5% down; scores between 500 and 579 require 10% down. Whatever the program, keeping credit utilization below 30% of your available revolving credit helps your score and signals to underwriters that you’re not overextended.
Debt-to-Income Limits
Your debt-to-income ratio is your total monthly debt payments, including the proposed housing payment, divided by your gross monthly income. Every recurring obligation counts: car loans, student loans, minimum credit card payments, the new mortgage. This one number carries enormous weight because it measures whether you’ll have room to breathe after paying everyone.
The caps depend on program and underwriting method:
- Conventional through Desktop Underwriter: up to 50%.8Fannie Mae. Debt-to-Income Ratios
- Conventional manual underwriting: 36% baseline, stretching to 45% with stronger credit and reserves.8Fannie Mae. Debt-to-Income Ratios
- FHA: 31% for housing alone, 43% for total debt, with exceptions for compensating factors.
You may have heard that 43% is a hard federal ceiling. It used to be. Before 2021, the qualified mortgage rule at 12 CFR § 1026.43 imposed a 43% DTI cap. The CFPB replaced that with a price-based standard: a loan qualifies as a qualified mortgage if its annual percentage rate doesn’t exceed the average prime offer rate by more than 2.25 percentage points, regardless of DTI.9Consumer Financial Protection Bureau. Factsheet – Prepaid Interest and the General Qualified Mortgage APR Lenders still have to verify your ability to repay, but no single DTI number is written into federal regulation as the pass/fail line.
If your ratio is too high, paying down revolving debt before you apply is the fastest fix. Eliminating a $300 monthly car payment moves your DTI the same amount as earning $300 more each month.
Cash Reserves
Reserves are the savings left after closing, counted in months of your full housing payment: principal, interest, taxes, insurance, and any association dues. Fannie Mae’s minimums vary by property type:10Fannie Mae. Minimum Reserve Requirements
- One-unit primary residence through Desktop Underwriter: no minimum.
- Second home: two months.
- Two- to four-unit primary residence or investment property: six months.
- Cash-out refinance with DTI above 45%: six months.
Reserves have to be liquid or easily converted. Retirement accounts like a 401(k) or IRA usually count at a discounted value, commonly 60% to 70%, to account for taxes and penalties on early withdrawal. Gifts can serve as down payment funds in many programs but don’t generally count as reserves, because the lender wants to see money you accumulated yourself.
Down Payment, Assets, and Loan-to-Value
For a purchase, expect to provide two months of bank statements verifying the source of your down payment and closing costs.11Fannie Mae. Verification of Deposits and Assets Refinances require only the most recent month. Underwriters look closely at large, unexplained deposits, since those can signal undisclosed loans or gifts that change the picture. A deposit that doesn’t match your normal payroll pattern will need a paper trail.
Your loan-to-value ratio is the loan amount divided by the appraised value. A $400,000 loan on a $500,000 home is 80% LTV. On conventional loans, private mortgage insurance is required when LTV exceeds 80%. PMI protects the lender if you default, but you pay for it as a monthly premium. Under the Homeowners Protection Act, your servicer must automatically cancel PMI once the loan balance is scheduled to reach 78% of the home’s original value, if you’re current. You can request cancellation earlier at 80% LTV.12Federal Reserve. Homeowners Protection Act of 1998
FHA is different. Instead of PMI, borrowers pay a mortgage insurance premium, both an upfront charge rolled into the loan and a monthly amount. On most FHA loans with less than 10% down, this insurance stays for the life of the loan, which is why many borrowers refinance into conventional once they’ve built enough equity.
Property Appraisal
The property is the lender’s collateral. If you stop paying, it needs to be worth enough to recover the loan through a sale. A licensed appraiser inspects the home and compares it to recent sales of similar nearby properties, then reports adjusted value, condition, and photos of any defects.
FHA appraisals go further than conventional ones. The appraiser must confirm the property is free of health and safety hazards, including lead paint, methamphetamine contamination, and inadequate sewage systems.13HUD. Rescission of Outdated and Costly FHA Appraisal Protocols Conventional appraisals concentrate on market value; major structural issues will still sink the deal, but the condition standard is less strict.
How FHA and VA Differ
FHA
FHA loans, insured by the Federal Housing Administration, are built for lower credit scores or smaller down payments. Minimum down is 3.5% with a 580 score, or 10% between 500 and 579. Standard DTI limits are 31% for housing and 43% for total debt, with room for higher ratios under automated underwriting when compensating factors exist. The property has to meet HUD’s minimum standards, which are stricter than conventional.
VA
VA loans, available to eligible veterans, active-duty service members, and surviving spouses, require no down payment and no monthly mortgage insurance. VA underwriting also includes a residual income test: how much money you have left each month after your mortgage, taxes, debts, and estimated living expenses based on family size and region.5HUD. HUD Handbook 4155.1 – Non-Taxable and Projected Income Two borrowers with the same DTI can have very different residual income depending on where they live and how many dependents they support. VA loans carry a one-time funding fee that varies by down payment and whether it’s your first VA loan.
Automated vs. Manual Underwriting
Most files run through an automated system before a human sees them. Fannie Mae’s Desktop Underwriter and Freddie Mac’s Loan Product Advisor evaluate credit, income, assets, and property in seconds and return a risk finding plus a list of required documents.14Fannie Mae. Desktop Underwriter and Desktop Originator An “approve/eligible” finding is what every loan officer wants, because it streamlines paperwork.
Manual underwriting happens when the automated system can’t approve the file, or when the program requires it. Standards tighten: Fannie Mae’s maximum DTI drops from 50% to 36–45%, and reserve minimums increase.8Fannie Mae. Debt-to-Income Ratios If your file needs manual review, you aren’t denied. The path is just narrower and the paperwork heavier.
Approval, Conditions, and Denial
Underwriting ends in one of three places. Clear-to-close means the file meets every guideline and final documents can be prepared. Conditional approval means you’re nearly there but need to supply remaining items: an updated pay stub, a letter of explanation for a credit inquiry, proof of homeowner’s insurance. This is the most common initial outcome. Denial means the file didn’t meet requirements.
Timelines vary. A clean file can wrap in a few days; a file needing extra documentation commonly takes a week or more. The full mortgage closing process averages 45 to 60 days from application to funding. You can move things faster by having every document organized before you apply and by responding to conditions within a day.
If you’re denied, the Equal Credit Opportunity Act requires the lender to send a written adverse action notice within 30 days of the decision on your completed application.15Consumer Financial Protection Bureau. Regulation B – 1002.9 Notifications The notice must include either the specific reasons for the denial or a statement of your right to request them within 60 days. Vague answers like “you didn’t meet our internal standards” aren’t legally sufficient; the lender has to identify the principal factors. Common reasons are insufficient income, DTI over program limits, recent late payments or high utilization, thin reserves, or an appraisal below the purchase price. In many cases, paying down debt, correcting a credit report error, or letting a derogatory mark age can move you from denial to approval within a few months.