Mortgage Basics
How Does Mortgage Underwriting Work?
Mortgage underwriting is the process lenders use to evaluate whether a borrower qualifies for a loan and what risk they present. Underwriters analyze the borrower's financial profile and the property to make approve, deny, or conditional-approval decisions. Understanding underwriting helps agents set realistic expectations for clients.
The Four Cs of Underwriting
Capacity
Can the borrower repay? Evaluated through income, employment stability, and debt-to-income ratio. The most critical C — lenders want consistent, documented income with manageable debt obligations.
Capital
Does the borrower have assets and reserves? Down payment funds, savings, investments, and other assets demonstrate financial stability and reduce default risk. Most lenders require 2–12 months of reserves after closing.
Credit
Will the borrower repay based on past behavior? Credit score, payment history, length of credit history, and public records (bankruptcies, foreclosures) all factor in. Higher scores = lower risk = better rates.
Collateral
Is the property worth the loan amount? The appraisal establishes the property's value as collateral. If the appraisal comes in below the purchase price, the lender may not approve the full loan amount.
Real Estate Exam Key Points
The Four Cs: Capacity, Capital, Credit, and Collateral
Conditional approval: loan is approved subject to satisfying specific conditions
Conditions must be 'cleared' before the loan can close
Automated underwriting systems (AUS): Fannie Mae's DU, Freddie Mac's LP
Pre-qualification = unverified estimate; Pre-approval = verified, documented review
A loan commitment letter comes after full underwriting and appraisal are complete