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Debt-to-income ratio (DTI) is one of the most important numbers in your mortgage approval, yet most buyers have only a vague sense of how it works. Getting this wrong can lead to frustrating surprises late in the process. Here's the full picture.
Two DTI numbers, not one
Lenders look at two separate DTI figures. The front-end DTI (also called the housing ratio) divides your proposed monthly housing payment by your gross monthly income. The back-end DTI (the number most lenders focus on) divides all of your monthly debt payments — including the new housing payment — by your gross monthly income. When lenders mention your DTI, they almost always mean the back-end figure.
What counts toward your DTI
- Proposed housing payment: principal, interest, property taxes, homeowners insurance, and HOA dues if applicable.
- Minimum credit card payments (not your balance — just the minimum payment).
- Auto loan payments.
- Student loan payments (even if in deferment — lenders often use 0.5–1% of the balance if in forbearance).
- Personal loan and installment loan payments.
- Other mortgage payments if you own other real estate.
What does not count toward your DTI
- Utility bills (electricity, gas, water, internet).
- Cell phone bills.
- Insurance premiums other than homeowners insurance included in escrow.
- Subscription services.
- Groceries, childcare, and day-to-day living expenses.
DTI is calculated on gross income — what you earn before taxes and deductions. If your W2 shows $90,000 per year, your gross monthly income is $7,500. That's the denominator lenders use, not your take-home pay.
What the limits are by loan type
Conventional loans through Fannie Mae and Freddie Mac typically allow back-end DTI up to 45–50% with strong compensating factors (high credit score, significant reserves). FHA loans are more flexible, often allowing DTI up to 57% with strong credit. VA loans have no strict DTI limit but typically want to see the ratio below 41% without additional justification. USDA loans generally cap at 41–44%. These are guidelines, not guarantees — individual lenders can be more conservative.
Five practical ways to improve your DTI
- Pay off a small installment loan entirely before applying — eliminating the monthly obligation can shift your DTI meaningfully.
- Pay down your credit card balances to reduce the minimum payment amount.
- Avoid taking on new debt of any kind in the months before your application.
- Consider a longer loan term to lower the proposed monthly payment.
- Document side income or rental income that qualifies — a second income stream can raise the denominator significantly.