Your debt-to-income ratio (DTI) measures how much of your gross monthly income goes toward debt payments. It’s one of the primary numbers lenders examine when deciding whether to approve a loan and at what rate. A low DTI signals manageable debt; a high DTI signals financial strain and higher default risk.
How to calculate your DTI
DTI = Total monthly debt payments ÷ Gross monthly income × 100
What counts as “debt payments”: mortgage or rent, car loans, student loans, minimum credit card payments, personal loans, child support, alimony, and any other recurring debt obligations.
What does not count: utilities, groceries, insurance premiums, gym memberships, and other living expenses.
Gross income is your income before taxes and deductions. For salaried employees, this is straightforward. For self-employed borrowers, lenders typically use a 2-year average of net income from tax returns.
Worked example
A household with the following monthly obligations:
- Rent or mortgage: $1,500
- Car loan: $350
- Student loan: $300
- Credit card minimum payments: $150
Total monthly debt payments: $2,300
With a gross monthly income of $7,000:
DTI = $2,300 ÷ $7,000 = 32.9%
This borrower is in solid shape by most lending standards.
Two types of DTI: front-end and back-end
For mortgage underwriting specifically, lenders calculate two distinct ratios:
Front-end DTI (also called the “housing ratio”) measures only your proposed housing costs — mortgage principal, interest, property taxes, homeowner’s insurance, and HOA dues — divided by gross income. Most conventional lenders prefer front-end DTI below 28%.
Back-end DTI measures all monthly debt obligations (including housing) divided by gross income. This is the number most commonly referenced as “your DTI.” The qualifying thresholds discussed below all refer to back-end DTI.
| DTI type | What it includes | Preferred threshold |
|---|---|---|
| Front-end | Housing costs only | Under 28% |
| Back-end | All monthly debt | Under 36–43% depending on loan type |
What lenders look for by loan type
Different loan programs use different DTI limits. These are the current standards as of 2026:
| Loan type | Maximum DTI | Notes |
|---|---|---|
| Conventional (Fannie Mae/Freddie Mac) | 45% manual underwriting; up to 50% via automated underwriting (DU) | 36% preferred; strong reserves or high credit score can support up to 45% |
| FHA | 43% standard; up to 56.9% with automated approval | 31% front-end / 43% back-end standard; higher ratios require AUS “Approve/Eligible” |
| VA | No hard cap (AUS); 41% for manually underwritten | Lenders apply additional scrutiny above 41%; no front-end ratio requirement |
| USDA | 29% front-end / 41% back-end | Stricter than other government programs |
| Personal loans | 35–50% | Varies widely by lender and credit profile |
The 43% threshold matters specifically because it defines the outer boundary of a “qualified mortgage” (QM) — the class of home loan with the strongest consumer legal protections under the Dodd-Frank Act, as tracked by the CFPB. Staying under 43% ensures more loan products remain available to you.
How DTI affects your loan terms — not just approval
DTI doesn’t just determine whether you get approved. It also influences the rate you’re offered. Borrowers with identical credit scores but different DTIs can receive meaningfully different rate quotes:
- A borrower at 28% DTI applying for a conventional mortgage typically receives offers close to the best available rate for their credit tier
- A borrower at 42% DTI may still be approved but receives a higher rate — compensating the lender for elevated risk — and has fewer lender options
- A borrower above 43% DTI for a conventional mortgage may be declined outright or forced into a non-QM product, which carries higher rates and fewer consumer protections
This compounds over time. On a 30-year $350,000 mortgage, a 0.5 percentage point rate difference costs approximately $33,000 in additional interest over the life of the loan.
Why DTI matters beyond loan approval
A high DTI doesn’t just affect borrowing — it describes how much room your budget has to absorb shocks. If 45% of your gross income goes to debt payments, a 10% income drop or unexpected medical expense creates immediate payment stress.
Financial planners frequently cite 36% as the point where debt begins crowding out other financial goals. Above 36%, money flowing to debt repayment is money not going to emergency funds, retirement contributions, or savings. Below 36%, most households have enough slack to build financial cushion while servicing debt.
Detailed comparison: DTI scenarios at the same income
The table below illustrates how debt composition affects DTI for a household earning $6,500/month gross:
| Debt | Monthly payment | Running DTI |
|---|---|---|
| Mortgage ($280K, 30yr, 7%) | $1,863 | 28.7% |
| + Car loan | $400 | 34.8% |
| + Student loan | $300 | 39.4% |
| + Credit card minimums ($8K balance) | $200 | 42.5% |
| + Personal loan | $150 | 44.8% |
Adding the personal loan pushes this borrower above the 43% QM threshold, eliminating conventional mortgage eligibility — even though the monthly amounts seem incremental.
How to lower your DTI
Two levers exist — reduce debt or increase income:
Reduce debt:
- Pay down credit card balances; card minimums are included in DTI even if you pay more
- Pay off installment loans that are near their end — eliminating a car payment with 3 months remaining removes it from the DTI calculation immediately
- Avoid taking on new debt before applying for a major loan
Increase income:
- A documented raise, promotion, or second income source all raise your denominator
- Self-employed borrowers can improve DTI by reducing business deductions in the 1–2 years before applying (higher net income on returns = lower DTI)
- Rental income from a property you own can count if documented for 2+ years on tax returns
Note: lenders use the minimum required payment on revolving debt (credit cards), not what you actually pay. If your minimum is $200/month and you always pay $500, the DTI calculation uses $200. Paying the balance down to zero removes it entirely.
Common mistakes
- Closing paid-off credit cards: Closing a card doesn’t help DTI (the minimum payment was already $0) but reduces available credit and hurts your credit utilization ratio.
- Opening new accounts before applying: Each new installment loan or credit card with a balance adds to your monthly obligations and raises DTI.
- Underestimating self-employment income: Lenders use net income from tax returns, not gross revenue. High deductions for business expenses reduce the income that counts for DTI purposes.
- Forgetting co-signed loans: If you co-signed a loan for someone else, that obligation counts in your DTI — even if the primary borrower makes every payment.
- Ignoring student loan deferment: Some lenders count deferred student loans at 0.5–1% of the outstanding balance as a monthly payment even during deferment periods.
Your next step
Calculate your DTI before applying for any major loan. If it’s above 43%, identify which debt can be paid down fastest to move the number, or wait until income increases. If you’re planning to apply for a mortgage in the next 6–12 months, avoid taking on any new debt — car loans, furniture financing, new credit cards — during that period. Each new obligation raises your DTI and can shift you out of qualification range at the moment it matters most.