Underwriting is the part of the loan process that confuses people most — and the part where files most often stall. Here’s what’s actually happening in the black box.
What an underwriter does:
- Verifies every income, asset, and debt claim on your application against documentation
- Confirms the property meets program guidelines (appraisal, title, insurance)
- Calculates DTI, LTV, and runs your file against the program’s rules
- Decides: approve, approve with conditions, suspend, or deny
The four things that slow underwriting down:
- Large unsourced deposits in your bank statements. Anything over $1,000 that isn’t from payroll needs documentation.
- Income changes between application and close. Bonus structure changes, a job switch, becoming a contractor — all require a fresh look.
- Credit inquiries or new debt during the process. Don’t open a new credit card or finance a couch until you close.
- Conditions that need re-clearing. Underwriter asks for a document, you provide it, they ask for a clarification. Each round adds 1–3 days.
What you can do:
- Document large deposits proactively
- Don’t open new credit
- Respond to condition requests within 24 hours
- Keep your job and income consistent until close
The realistic timeline
Initial underwriting: 24–72 hours after a complete file is submitted. Conditional approval: 5–10 days. Final clear-to-close: 2–4 weeks total for a standard purchase.
If you want to talk through your specific timeline, that’s free. I’d rather you understand what’s happening than be in the dark for three weeks.