The short version
An underwriter's job is to prove, on paper, that you can repay the loan, that you will, and that the house is worth what you're paying. That's it. Capacity, credit, collateral.
Almost every file comes back with a conditional approval, not a clean one. That's normal. Conditions are just the underwriter saying, 'I'm good with this, once I see X, Y and Z.'
The buyers who close on time aren't the ones with perfect files. They're the ones who answer conditions the same day and don't change anything about their finances while the loan is in process.
What does a mortgage underwriter actually look for?
Think of it as three questions. Every document you send answers one of them.
Can you afford it? That's income and debt. The underwriter recalculates your income from pay stubs, W-2s or tax returns, often more conservatively than you'd calculate it yourself, and then compares your monthly debts plus the new house payment against that income. That's your debt-to-income ratio.
Will you pay it? That's credit history. Not just the score. They read the report line by line: late payments, collections, new accounts, and every inquiry from the last few months.
Is the house good collateral? That's the appraisal, the title report and, in parts of Sonoma County, the insurance. If the property can't be insured at a reasonable cost, it can't be financed, and in some fire-exposed areas that's become a real issue.
- Income: stable, likely to continue, and documented. Usually two years of history in the same line of work.
- Assets: enough for down payment, closing costs and sometimes reserves, with a paper trail for where the money came from.
- Credit: score, payment history, and anything that changed since the pre-approval.
- Property: appraised value, condition, title, and insurability.
What is a conditional approval?
It means the underwriter has reviewed the whole file and approved the loan, subject to a list of items. Some are routine, like a final verification of employment a few days before closing. Some are specific to you.
I tell clients not to read a long condition list as bad news. A file with 15 conditions that are all paperwork is in better shape than a file with three conditions where one of them is 'explain the $22,000 deposit.'
Conditions usually come in two buckets. Prior-to-document conditions have to be cleared before the lender will draw closing documents. Prior-to-funding conditions can be handled at or just before signing. Once everything in the first bucket is signed off, you get the words everyone wants to hear: clear to close.
What are the most common underwriting conditions?
These show up on file after file. If you get ahead of them, you'll shave days off the process.
- Large deposits. Anything that isn't your normal payroll, often defined as a deposit over half your monthly income, needs a source. A transfer from your own savings is easy; bring the other statement. Cash deposits are hard. Don't deposit a pile of cash during a loan.
- Letters of explanation. A late payment, a gap in employment, a recent credit inquiry, an address you don't recognize on the credit report. Keep it short, factual, signed and dated. Underwriters don't want your life story.
- Updated statements. If your bank statements go stale before closing, often past 60 days old, you'll be asked for the newest one. Every page, even the blank ones.
- Gift documentation. A signed gift letter, plus proof the money left the giver's account and landed in yours.
- Tax transcripts. Lenders pull IRS transcripts to match your returns. If you just filed or amended, this can lag.
- Proof of insurance. A binder showing coverage that meets the lender's minimums. In the North Bay this is the one I now start on first, because it can take the longest.
What causes a loan to get denied in underwriting?
Honestly, it's rare when the file was built right upfront. When it happens, it's usually one of a few things.
New debt. I've seen this go sideways more than once: buyer gets approved, then finances a car, or a couch, or opens a store card for 15% off a washer. The new payment pushes the debt ratio over the line and suddenly the approval is gone. Wait until after you have keys.
A job change. Moving from salary to commission, or to self-employment, in the middle of a loan can reset the clock on how income gets counted. Tell your loan officer before you accept the offer, not after.
Income that doesn't hold up. Overtime or bonus income that dropped this year, a business that showed less profit on the most recent return, or a 1099 contract that isn't clearly continuing.
The appraisal or the property. A low value changes your loan-to-value. A property with unpermitted additions, an unfinished kitchen or a failing roof can trigger repairs before a lender will close.
How long does underwriting take?
Initial review is often a few business days from submission, but it depends heavily on the lender's pipeline, and that moves with the market. When rates drop and refinances flood in, turn times stretch. Treat any number you hear as approximate and ask for the lender's current turn time for your scenario.
The part you control is resubmission. Every time conditions go back to underwriting, the file goes back into a queue. Sending conditions piecemeal, one document on Monday and two more on Thursday, is how a 30-day close becomes a 40-day close. Send everything in one clean package.
This is a big reason I like working as a broker. If one lender's underwriting is backed up two weeks, I can often place the file with one that isn't, before we're up against a contract deadline.
How do I get through underwriting without surprises?
Most of this is common sense, but it's the stuff people skip when they're busy packing boxes.
- Give your loan officer everything upfront, including the stuff you're worried about. A 2019 collection is a two-minute conversation early and a two-day scramble late.
- Don't move money between accounts without a reason, and keep records when you do.
- Don't open or close credit accounts. Don't co-sign for anyone.
- Keep paying everything on time, including the rent and the credit card you forgot you had.
- Answer conditions the same day if you can. Read the exact wording, and send exactly what's asked.
- Start the homeowners insurance quote the week you go into contract, not the week before closing.