Underwriting
Definition
Underwriting is the lender’s evaluation of a mortgage application—the review of credit, income, assets, and the property—to decide whether to approve the loan and on what terms.
In plain English
After an application, someone has to decide whether the loan meets the lender’s and investor’s requirements. That review is underwriting. Automated tools and manual reviews are methods. This page is the evaluation process, not a list of cutoffs and not a branded automated system.
Technical definition
Fannie Mae’s consumer glossary describes underwriting as the lender’s evaluation of the application. This page does not state universal approval criteria or treat a specific automated engine as the definition.
Why it matters
Preapproval, conditions, and clear-to-close language all sit inside underwriting. Readers need the process name without a hidden rulebook.
Related terms
Sources reviewed
Glossary of key terms
ObservedSeptember 4, 2026
Important note
Underwriting standards vary by lender, product, and investor. This page does not publish approval thresholds.