Your debt-to-income ratio (DTI) is the percentage of your gross monthly income that goes toward debt payments. Lenders use it as one of the primary measures of whether you can handle additional debt. Understanding what counts, how it is calculated, and what thresholds matter helps you prepare for a mortgage or loan application.
How DTI is calculated
DTI = total monthly debt payments / gross monthly income x 100. Gross income is before taxes and deductions. Monthly debt payments include: minimum credit card payments, auto loans, student loans, personal loans, child support, alimony, and the proposed new mortgage payment. It does not include utilities, phone bills, subscriptions, or groceries — only formal debt obligations with a required minimum payment. Example: $3,200 in monthly debt payments on a $9,500 gross monthly income = 33.7% DTI.
Front-end vs. back-end DTI
Mortgage lenders look at two versions. Front-end DTI includes only housing costs — principal, interest, taxes, insurance, and HOA dues — as a percentage of gross income. Back-end DTI includes all monthly debt payments. Most lenders focus on back-end DTI. Common thresholds: conventional lenders typically want back-end DTI under 43%, with 36% preferred. FHA loans allow up to 43% with some flexibility above that. Front-end DTI preferences run around 28% for conventional loans.
What a good DTI looks like
Under 36%: strong. Most lenders are comfortable here and you will have more options and better rates. 36-43%: acceptable for most loan types, but lenders scrutinize other factors more carefully. 43-50%: difficult to qualify for conventional loans; FHA or specialized products may still be available. Above 50%: most lenders will not approve additional debt. You are spending more than half of gross income on debt payments, which leaves limited margin for savings and unexpected expenses.
How to improve your DTI
Two levers: increase income or reduce debt payments. Increasing income is the more powerful lever. On the debt side, paying off installment loans and credit card balances reduces required monthly payments. Before applying for a mortgage, avoid taking on new debt — new loans raise your DTI and trigger credit inquiries, both of which can affect your application.
Frequently asked questions
Does DTI include my rent payment?
Current rent is not included in your DTI calculation — it is not a formal debt obligation. When you apply for a mortgage, the proposed mortgage payment replaces rent in the DTI calculation. This is why people who pay high rent but have low formal debt often have a better DTI than their monthly obligations suggest.
Can I get a mortgage with a 50% DTI?
Some loan programs allow higher DTIs with compensating factors — a large down payment, significant cash reserves, or a very high credit score. FHA loans have accommodated DTIs up to 57% in limited cases. Conventional loans typically cap at 45-50% for well-qualified borrowers. At 50%+, your options narrow considerably.
Good places to double-check
Use your gross monthly income and recurring debt payments. If you are applying for a mortgage or loan, ask the lender which debts they include.