Debt-to-Income Ratio for Investment Property: How Lenders Qualify You

What Is Debt-to-Income Ratio (DTI)?

Debt-to-income ratio (DTI) is the percentage of your gross monthly income that goes toward monthly debt payments. Lenders use it on conventional loans to judge whether a borrower can afford a new mortgage on top of existing obligations.

A lower DTI signals more room in the budget and lower risk. A higher DTI means more of your income is already committed, which can limit how much you can borrow or disqualify a loan entirely.

How to Calculate DTI

Add up recurring monthly debt payments, including the proposed mortgage, other property loans, car loans, student loans, and minimum credit card payments. Divide by gross monthly income before taxes, then multiply by 100.

Utilities, insurance, and normal living expenses are not counted as debts. Many conventional lenders look for a total DTI at or below roughly 43% to 45%, though limits vary by loan program and borrower profile.

How Rental Income Counts in DTI

• Lenders often count only about 75% of gross rent to allow for vacancy and expenses.
• For an existing rental, tax returns and a lease usually document the qualifying income.
• For a new purchase, an appraiser market-rent schedule can support projected rent.
• Net positive rental income can be added to income; net negative rental income is added to your debts.
• Seasoning and documentation rules vary, so the same rent can be treated differently by different lenders.

DTI vs DSCR

DTI is a borrower-level test used on conventional loans; it looks at your personal income against all your debts. DSCR is a property-level test used on many investment loans; it looks at whether the property own income covers its own loan payment, ignoring your personal income.

This distinction matters for investors who hit conventional DTI limits. A DSCR loan can qualify based on the rental cash flow instead, which is why DSCR products are popular once a portfolio grows.

Worked Example

A borrower earns $9,000 gross per month. Existing debts are a $1,800 primary mortgage, a $500 car payment, and $200 in minimum credit card payments, totaling $2,500. That is a 28% DTI before any new loan.

Adding a new $1,600 rental mortgage offset by $1,200 in qualifying rent (75% of $1,600 gross) adds a net $400 to debts. Total debt becomes $2,900, and DTI rises to about 32%, still within common conventional limits.

Frequently Asked Questions