Debt-to-Income Ratio Calculator

What is a debt-to-income ratio and why it matters

Your debt-to-income ratio (DTI) is the percentage of your gross monthly income that goes toward debt payments. Lenders use it as a quick way to assess whether you can afford to take on more debt. A lower DTI means more of your income is available for new obligations, making you a less risky borrower.

DTI does not appear on your credit report. Lenders calculate it themselves when you apply for a mortgage, auto loan, personal loan, or credit card. It sits alongside your credit score as one of the two primary qualification metrics.

The formula is straightforward: divide your total monthly debt payments by your gross monthly income, then multiply by 100. If you pay $1,500 per month toward debt and earn $5,000 per month before taxes, your DTI is 30%.

How lenders use your DTI

Different loan products have different DTI thresholds:

• Conventional mortgages: The Consumer Financial Protection Bureau's qualified mortgage rule caps DTI at 43% for most conventional loans. Some lenders set their own limit at 36%.
• FHA loans: May allow DTIs up to 50% with compensating factors like a larger down payment or cash reserves.
• Auto loans: Lenders typically prefer DTI below 50%, though approval depends heavily on the loan-to-value ratio of the vehicle.
• Personal loans: Most lenders want to see DTI below 40%, though online lenders may be more flexible with higher interest rates.

A DTI in the "concerning" range does not automatically mean a denial, and a DTI in the "excellent" range does not automatically mean approval. Lenders consider DTI alongside credit score, employment history, down payment size, and other factors.

Front-end vs back-end DTI

Mortgage lenders often use two versions of DTI. Front-end DTI (also called the housing ratio) includes only housing costs: mortgage principal, interest, property taxes, and homeowner's insurance. Most lenders want this below 28%.

Back-end DTI includes all monthly debt obligations: housing costs plus car payments, student loans, credit card minimums, personal loans, child support, and any other recurring debt. The 43% qualified mortgage threshold applies to back-end DTI.

This calculator computes your back-end DTI, which gives the most complete picture of your debt load relative to income.

How to lower your DTI

There are two paths, and combining them is most effective:

• Reduce debt payments: Pay off smaller debts entirely. Refinance high-rate debts to lower monthly payments. Consolidate multiple payments into one.
• Increase income: A raise, side income, or a new job with higher pay reduces your DTI even if your debt stays the same.

Cutting discretionary spending does not affect DTI directly. DTI measures committed debt payments against gross income. However, freeing up cash lets you accelerate debt payoff, which lowers your payments over time.

DTI vs Burden Score

Credit scores measure your repayment history. DTI measures your payment load. The Burden Score measures your financial vulnerability. They answer three different questions:

• Credit score: "Has this person paid on time in the past?"
• DTI ratio: "What share of this person's income is already committed?"
• Burden Score: "How much pressure is this person's debt actually putting on their life?"

The Burden Score factors in interest rates, minimum payment traps, payment-to-balance ratios, and term lengths. Two people with identical DTIs can have very different Burden Scores if one is carrying high-rate revolving debt and the other has a low-rate mortgage.

A 35% DTI with $40,000 in credit card debt at 24% APR is a fundamentally different situation than a 35% DTI with a $250,000 mortgage at 5% APR. DTI cannot tell the difference. The Burden Score can.