Mortgage glossary

Debt-to-Income Ratio

A ratio comparing monthly debt obligations to gross monthly income.

Last updated 2026-05-04. Educational planning only.

Quick answer: A ratio comparing monthly debt obligations to gross monthly income.

Definition

A ratio comparing monthly debt obligations to gross monthly income.

Why it matters

Debt-to-Income Ratio matters because buyers need to understand the full cash-flow impact of a mortgage before committing to a home.

Related formula

True monthly cost = loan payment + ownership costs + utilities + maintenance reserve

FAQ

What does Debt-to-Income Ratio mean?

A ratio comparing monthly debt obligations to gross monthly income.

Why does it matter for affordability?

Debt-to-Income Ratio can change the true monthly cost or cash required to buy a home.

Where can I test it?

Use the TrueCost calculator to see how the term affects payment, DTI, or leftover cash.