What Underwriters Actually Look At When They Open Your File

A borrower called me last spring, genuinely annoyed. His score was in the 780s, he'd been at the same employer nine years, and his file had been sitting in underwriting for eleven days with nothing back. He wanted to know what on earth was taking so long.

I asked him one question. Had he moved any money around in the last two months? Long pause. He'd sold a motorcycle, taken cash for it, and walked it into the bank. That was the whole delay. One line on a checking statement that nobody had explained yet.

I've been in real estate since 1988 and closing loans since 1994, and this surprises people every single time. Underwriting isn't a scoreboard. Nobody back there is checking whether you cleared some number and then stamping the file. They're assembling a story out of paper, and the story has to hold together from one document to the next.

Here's what they're actually reading.

Key takeaways

• Federal law names eight things a lender has to consider before making most mortgage loans, and your credit score is only part of one of them.
• Fannie Mae tells lenders to weigh the layering of risk factors rather than grade each item separately, so three small weak spots can matter more than one obvious one.
• Where your money came from matters as much as whether it's sitting there. Fannie Mae defines a large deposit as a single deposit exceeding 50% of total monthly qualifying income, and on a purchase it has to be documented.
• Reserves are what's left after closing, counted in months of the loan's qualifying payment, and not every account you own will count.
• Most files stall on paperwork, not on credit. The underwriter's conditions are a list, and the file moves when the list is empty.

The eight things the law makes a lender consider

Start with the floor, because it's written down. Under the ability-to-repay rule at 12 CFR 1026.43(c)(2), a creditor making most closed-end mortgages has to consider the borrower's current or reasonably expected income or assets, employment status if the lender is relying on employment income, the monthly payment on this loan, the monthly payment on any simultaneous loan, mortgage-related obligations, current debt obligations along with alimony and child support, the debt-to-income ratio or residual income, and credit history.

Read that list again and notice the shape of it. Seven of the eight are about money moving in and out every month. One is about credit history. That proportion is roughly how an underwriter's attention gets divided too, which is close to the opposite of how most borrowers picture it.

Income: reliable beats large

The underwriter isn't really asking whether you earn enough. They're asking whether what you earned last year, and the year before, is likely to keep arriving.

That distinction is why a salaried employee with a modest, boring W-2 often sails through while a business owner earning considerably more spends three weeks in documentation. It's also why a raise two weeks before closing can create work rather than relief, and why a job change mid-process, even a good one, resets part of the analysis.

Employment gets re-checked near the end, not just at application. Fannie Mae's Selling Guide calls for a verbal verification of employment completed no more than 10 business days on or before the note date for employment income, and no more than 120 calendar days on or before the note date where self-employment income is involved. People quit jobs between application and closing more often than you'd think. That verification exists because of them.

On ratios: as Fannie Mae's Selling Guide read in October 2026, the maximum total debt-to-income ratio for a manually underwritten loan was 36% of stable monthly income, extendable to 45% for borrowers who meet the credit score and reserve requirements in Fannie Mae's Eligibility Matrix, while casefiles run through Desktop Underwriter allowed up to 50%. Those are Fannie Mae's parameters, not a statement about any particular file, and the other agencies set their own.

Assets: the question is where it came from

This is where the motorcycle money lives, and it's the single most common reason a clean-looking file goes quiet.

Fannie Mae defines a large deposit as a single deposit that exceeds 50% of the total monthly qualifying income for the loan. On a purchase, if those funds are going toward what you bring to closing or toward reserves, the lender has to document that the deposit came from an acceptable source. If it can't be documented, the unsourced amount gets backed out of the verified funds and only what's left can be used.

So the paper trail is the asset. A cashier's check with no origin behind it is a number on a page. The same money with a bill of sale attached is an asset.

A few things reliably create conditions: cash deposits of any kind, transfers between accounts without both sides shown, money that arrives from a relative without a gift letter, and deposits into an account that was opened recently. None of those are problems. They're all just questions — and questions take days to answer when they get asked in week three instead of week one.

Reserves are the quiet variable

Reserves get almost no attention from borrowers and a great deal from underwriters.

Fannie Mae describes them as liquid or near-liquid assets available to a borrower after the mortgage closes, measured in months of the qualifying payment on the subject loan, counting principal, interest, taxes, insurance and assessments. Funds needed to close come out first. What's left over is the reserve.

What counts is narrower than people assume. Checking and savings, stocks, bonds, mutual funds, certificates of deposit, money market funds and trust accounts all count. The vested portion of a retirement account counts, as does the cash value of a vested life insurance policy. What doesn't: unvested funds, money you can only get at on retirement or termination or death, stock in an unlisted corporation, unvested stock options or restricted stock, personal unsecured loans, lender contributions and interested party contributions.

That last cluster matters because people count assets they can't actually reach. An employer match that vests in two years is real money, and it isn't a reserve.

Credit history is read as a pattern, not a number

The score opens the door to certain programs. What the underwriter reads is the history underneath it.

Recent behavior carries more weight than old behavior. A collection from 2014 sitting next to six years of clean payments tells a different story than one late payment from last quarter on a card you still carry. Balances that climbed steadily over the last several months tell their own story, and so do several new accounts opened during the shopping period.

It doesn't get graded in isolation either. Fannie Mae's comprehensive risk assessment tells lenders to evaluate the overall level of serious delinquency risk, taking into account the layering of risk factors, the significance of each one, and the cumulative effect of the whole picture. That's the sentence that explains why two borrowers with the same score get different outcomes. One of them had the score, the income and the reserves. The other had the score and not much holding it up.

The property gets underwritten too

Borrowers forget that the collateral has its own file. The appraisal has to support the value, the property has to be an eligible type in acceptable condition, and on a condominium the project itself gets reviewed separately from the borrower.

I've watched clean borrower files sit for a week because a project questionnaire hadn't come back. Nothing about the borrower changed. The property side just wasn't finished.

Why files actually stall

Here's the honest ranking, after three decades of watching it happen.

First, a document that was requested and never sent. Second, a deposit or transfer nobody explained. Third, something that changed mid-process — usually employment, a new car, or a credit card opened for furniture. Fourth, an appraisal that came back with a condition or a repair requirement. Fifth, and well behind the rest, something in the borrower's credit that was genuinely disqualifying.

A conditional approval, by the way, is just the underwriter's written list of what still has to be documented. Working that list the same week it lands is the single biggest thing a borrower controls.

Common questions

Does a higher credit score mean less documentation?

No. The documentation comes from the program and from the file itself, not from the score. A borrower with excellent credit and a complicated income picture will produce more paper than a borrower with average credit and a straightforward W-2.

Why does the lender want every page of a statement, including the blank ones?

Because a statement is only evidence when it's complete. A missing page is an unanswered question, and underwriters treat unanswered questions as risk. Send all of them, even the one that says this page intentionally left blank.

Can I pay off a credit card to improve my ratios during the process?

Sometimes it helps, and sometimes it creates a new condition, because the money that paid it off now has to be sourced. Ask your loan officer before you move anything. That one phone call has saved more closings than any other habit I can name.

Will changing jobs stop my loan?

Not necessarily, but it does change the analysis, and the verification near the note date will find it either way. Tell your loan officer the day you know. A planned change discussed early is a manageable item; the same change discovered in the final week is a scramble.

Where to go from here

If you'd like to see how the documentation differs by program before you start gathering anything, the loan program pages lay out what each one asks for.

And if you'd rather talk through your own situation with someone who'll tell you straight what the file is likely to need, get in touch. A fifteen-minute conversation at the start is worth a week in the middle.