Mortgage underwriting is the stage where a person or an automated system verifies your income, assets, credit, and the property, then decides whether the loan fits the guidelines of the program it was written for. It is a verification exercise, not a negotiation, and most delays come from missing or unexplained paperwork rather than from the underwriter’s judgment. This article walks through each step in order, shows what an underwriter looks for, works through real debt-to-income math, and lays out how to keep the file moving. This is the mortgage underwriting process explained from the broker’s side of the desk.
By Duane Buziak, NMLS #1110647.
Where Underwriting Sits Between Application and Closing
The CFPB’s homebuying guidance describes the sequence: you apply, you receive a Loan Estimate, the file goes to processing, underwriting reviews it, you receive a conditional approval, you satisfy the conditions and get a clear to close, and then you sign at closing. Underwriting sits in the middle, after the paperwork has been gathered and before anyone can schedule a signing.
It helps to be clear about what underwriting is not. It is not a rate shop. By this point your rate and program are chosen, and the underwriter is checking the file against the rulebook of the investor or agency that will buy or insure the loan. It is also not the same as pre-approval. A pre-approval letter is an early read based on information you reported. Underwriting is where documents replace claims.
Timing varies with the complexity of the file, the loan program, and how busy the market is. I will not quote an average, because any single number would mislead you. What I can say is that clean, fully documented files move fastest, and the time you control is the time between a request and your response.
The step that happens before underwriting is worth using. A soft credit pull mortgage pre-approval through NoTouch Credit Pull lets you see where you stand before a hard inquiry is placed. That is a no credit hit mortgage application start: you learn which programs your profile fits and what might trip the file later, without spending a credit inquiry to find out. Once you choose a path and move forward, the formal credit review happens as part of processing.
Automated Underwriting vs. Manual Underwriting
Most conventional files meet an automated underwriting system (AUS) first. Fannie Mae’s Desktop Underwriter and Freddie Mac’s Loan Product Advisor assess credit, income, assets, and the loan structure, then return a finding. Approve/Eligible means the file meets the agency’s risk standards, subject to documentation. Refer means the system could not approve it on its own terms, and a human must look closer.
An AUS finding is not a finished approval. It tells the underwriter which documents to verify, and the underwriter still confirms every item against the actual paperwork.
When a person takes over
Manual underwriting applies when the AUS refers a file or when the program requires it. Expect heavier documentation, tighter ratio limits, and a greater need for compensating factors: strengths that offset a weakness, such as substantial cash reserves, a low payment-to-income change from your current housing cost, or a long, stable job history. Manual review is not a penalty. It simply means judgment is applied where the algorithm declined to decide.
Non-QM files
Non-QM loans sit outside agency AUS findings and are underwritten to the guidelines of the specific program. One example is the Ally No-Ratio program from Champions Funding, a non-QM option aimed mainly at investors, where qualification generally leans on the property, credit, and assets rather than a traditional debt-to-income calculation. Guidelines for any non-QM program change, so confirm current terms before relying on them. That program name is unrelated to Ally Bank, and The Mortgage Ally by Duane Buziak is not affiliated with Ally Bank either.
This is where wide access matters. Duane Buziak shops hundreds of lenders at one time, so a file that struggles in one system can be placed where its profile fits. A self-employed borrower with irregular tax-return income, for instance, may fit a bank-statement program better than an agency AUS.
The Four Things an Underwriter Verifies: Credit, Income, Assets, Collateral
Credit
The underwriter reviews your score tier, payment history, utilization, and any recent derogatory items such as collections, late payments, or a prior foreclosure or bankruptcy, along with the seasoning those events require. Scoring models are also in transition. In July 2025 the FHFA announced that Fannie Mae and Freddie Mac would accept VantageScore 4.0 alongside Classic FICO. Implementation details have been rolling out, so I confirm the current status with each investor before telling a borrower which score a given file will use.
Income
For salaried borrowers, the underwriter wants recent paystubs, W-2s, and a two-year work history, often with a verbal or written verification of employment shortly before closing. Self-employed borrowers typically document with two years of tax returns, or with bank statements under certain non-QM programs. Income that is not documented and likely to continue generally does not count toward qualifying.
Assets
Your down payment, closing funds, and any required reserves must be sourced and seasoned. Underwriters typically review recent bank statements (the Fannie Mae Selling Guide sets the conventional standard) and look for large deposits that do not match your pay pattern. An unexplained deposit prompts a letter of explanation and a paper trail, such as the gift letter and donor’s statement for a family gift or the sale record for a car you sold. The reason is simple: borrowed money that is not disclosed changes your real debt load.
Collateral
The property has to support the loan amount. The appraisal establishes value and condition, title work confirms who owns the home and whether any liens exist, and homeowners insurance proves the asset is protected. A low appraisal does not end a deal, but it changes the loan-to-value math, and the price, down payment, or loan structure may need to change.
Worked Example: Debt-to-Income and LTV on a Virginia Purchase
For context on the Virginia market, the Census Bureau publishes the median value of owner-occupied homes for the state on its Virginia QuickFacts page. The figure moves with each data release, so check it there rather than trusting a number in an article. The scenario below is an illustration, not a quote or a rate commitment.
Suppose you buy a $400,000 home in Virginia with 5% down. Your down payment is $20,000 and your loan is $380,000, so the loan-to-value ratio (LTV) is $380,000 / $400,000 = 95%. Assume an illustrative 6.5% rate on a 30-year fixed loan.
- Principal and interest: about $2,402 per month.
- Property taxes (assumed $4,000 per year): about $333.
- Homeowners insurance (assumed $1,800 per year): $150.
- Mortgage insurance (assumed 0.5% annually on the loan): about $158.
- Total housing payment: about $3,043.
Your gross monthly income is $9,000, and you carry $600 in monthly debts, which includes a $350 car payment.
Front-end DTI is housing divided by income: $3,043 / $9,000 = 33.8%. Back-end DTI adds all monthly debts: ($3,043 + $600) / $9,000 = $3,643 / $9,000 = 40.5%.
Now suppose you pay off the car loan before applying. Monthly debts fall to $250, and back-end DTI becomes ($3,043 + $250) / $9,000 = $3,293 / $9,000 = 36.6%. That is almost four points of breathing room from a single payoff.
What that does to the AUS result depends on the rest of the file. As of this writing, the Selling Guide’s manual underwriting limit is generally 36%, rising to 45% with compensating factors, and Desktop Underwriter can approve files up to 50% depending on the overall risk picture. Confirm the current ceilings in the Selling Guide before planning around them. A payoff rarely turns a denial into an approval by itself, but it widens your margin if rates, taxes, or insurance quotes come in higher than expected.
Conditions, Suspense Items, and What Triggers Delays
Conditional approval means the underwriter will approve the loan if certain items are delivered. Conditions arrive in stages:
- Prior to approval: items needed before the underwriter can finish the decision, such as missing statements or an employment gap explanation. A file stuck here is sometimes called suspended.
- Prior to docs: items required before closing documents are drawn, such as final insurance or a corrected appraisal detail.
- Prior to funding: items verified close to or at closing, such as a final employment check or proof that funds have moved.
The common causes of delay are predictable: an undisclosed debt that appears on a refreshed credit report, a job change, new credit inquiries, a large deposit with no explanation, or an appraisal that comes in under the contract price.
What to avoid while the file is in underwriting
- Do not open new credit, finance furniture or a car, or co-sign for anyone.
- Do not change jobs or change how you are paid without telling your broker first.
- Do not move money between accounts without a paper trail, and do not make large cash deposits.
- Do not close accounts or pay off collections on your own without checking how it affects the file.
Responding to conditions within 24 hours
- Ask your broker to explain each condition in plain terms, including which document satisfies it.
- Pull complete documents: every page of a statement, not only the pages you consider relevant.
- Write letters of explanation in short, factual sentences, and sign and date them.
- Send everything in one organized package rather than piecemeal.
- Confirm receipt, then ask whether the submission clears the condition or raises a follow-up.
Broker vs. Retail Lender vs. Ally Bank: Who Handles Your Underwriting File
To be direct: The Mortgage Ally by Duane Buziak is not affiliated with Ally Bank. The similar name is a coincidence.
The structural difference is where the file goes. A broker submits your file to a wholesale investor’s underwriters, and which investor receives it can be chosen to match your profile. A retail lender typically underwrites in-house, so your file is judged against that company’s own overlays and program menu. Brokered files get the same scrutiny as any other, because the investor’s underwriter still verifies everything and the same agency rules apply.
The comparison below is factual and general. Programs, availability, and credit practices change, so verify each company’s current details directly before you decide.
- Duane Buziak (mortgage broker): Broker working with many investors. Wide program range, including conventional, government, and non-QM options. Underwriting is handled by the wholesale investor chosen for the file. Credit flexibility comes from the ability to place a file with the investor whose guidelines fit. Soft-pull pre-approval is available through NoTouch Credit Pull.
- Rocket: Large online retail lender. Broad consumer program menu. Underwriting is handled in-house. Credit flexibility follows its own guidelines. Confirm its current pre-approval credit practices directly.
- Movement: Retail lender. Conventional and government programs. Underwriting is handled in-house. Credit flexibility follows its own guidelines. Confirm its pre-approval credit practices directly.
- Veterans United: Retail lender with a strong focus on VA loans for military borrowers, plus other programs. Underwriting is handled in-house. Its VA specialty is a real strength for eligible borrowers. Confirm its pre-approval credit practices directly.
- NFM Lending: Retail lender with a branch network. Conventional and government programs. Underwriting is handled in-house. Confirm its pre-approval credit practices directly.
- Ally Bank: A bank, unrelated to The Mortgage Ally. It underwrites in-house under its own guidelines, and its mortgage offerings and availability have changed over time, so confirm what it currently offers.
None of these is wrong for everyone. A borrower with a straightforward W-2 file and a strong score may be well served by any of them, while a self-employed borrower, an investor, or someone with a credit blemish often benefits from having more than one set of guidelines to choose from. The right fit depends on your file.
Start the Process Knowing What the Underwriter Will Ask For
Underwriting is predictable when the file is documented before anyone asks. Gather two years of tax returns or W-2s, recent paystubs, two months of statements for every account holding your funds, and explanations for anything unusual, and most conditions never appear. If you are unsure which program fits your income or credit, the better move is to find out before a hard inquiry is placed, not after.
Your dream home is within reach. Discover what hundreds of lenders can offer you in one simple search with zero impact to your credit score. Get your free mortgage rate quote today and let us shop the market to secure you the best possible terms with our client-first approach. The Mortgage Ally by Duane Buziak offers a no credit hit mortgage application, so you can see where you stand first.
