Affordability
Debt-to-income ratio: how to calculate it and what lenders accept
Quick answer
Debt-to-income ratio (DTI) is your total monthly debt payments, including the new mortgage, divided by your gross monthly income. Most lenders prefer 36% or less. Conventional loans allow up to 50% with automated approval, FHA can go to about 57%, and VA and USDA use 41% as a guideline.
Your debt-to-income ratio is one of the main numbers a lender uses to decide how much you can borrow. It matters as much as your credit score, and it's often the reason buyers get approved for less than they expected.
How to calculate DTI
DTI = total monthly debt payments ÷ gross monthly income × 100
Gross income is before taxes and deductions. Lenders look at two versions:
- Front-end (housing) ratio: just the new housing payment — principal, interest, taxes, insurance, mortgage insurance and HOA
- Back-end (total) ratio: the housing payment plus all other monthly debts. This is the one that usually decides approval.
A real example
Your gross income is $7,000 a month. You have a $400 car payment, a $250 student loan payment and $100 in credit card minimums. The home you want has a total housing payment of $2,100.
- Front-end: $2,100 ÷ $7,000 = 30%
- Back-end: ($2,100 + $750) ÷ $7,000 = 40.7%
That fits conventional, FHA and VA guidelines. Paying off the $400 car loan would drop the back-end ratio to 35%.
What counts as debt
Included: the new mortgage payment, car loans and leases, student loans (even if deferred, lenders use a calculated payment), credit card minimum payments, personal loans, child support and alimony, and payments on other properties.
Not included: utilities, phone and internet, insurance not tied to the home, groceries, subscriptions and your current rent (which goes away when you buy).
Maximum DTI by loan type
| Loan type | Typical guideline | Maximum with strong file |
|---|---|---|
| Conventional | 36% to 45% | Up to 50% with automated approval |
| FHA | 31% housing / 43% total | About 57% with automated approval |
| VA | 41% total | Higher with strong residual income |
| USDA | 29% housing / 41% total | Higher with compensating factors |
Higher ratios usually need compensating factors: strong credit, cash reserves after closing, a larger down payment, or a long, stable job history.
Approved vs comfortable
A lender approving you at 50% DTI doesn't mean that payment is comfortable. Half your gross income going to debt leaves little room for taxes, savings, childcare and repairs. Many buyers aim for a back-end DTI of 36% or less. See how much home you can afford for the 28/36 rule.
How to lower your DTI
- Pay off small balances — an installment loan with 10 or fewer payments left can often be excluded
- Pay down credit cards to cut minimum payments
- Don't take on new debt before or during the loan process
- Add a co-borrower whose income you can count
- Choose a lower price or a bigger down payment to shrink the housing payment
- Document all income — overtime, bonuses and side income with a two-year history can count
Frequently asked questions
Does DTI affect my credit score?
No. Credit scores don't use income, so DTI isn't part of your score. Credit utilization, the share of your card limits you're using, is a different measure that does affect your score.
Do lenders use gross or net income?
Gross income, before taxes. For self-employed borrowers, lenders use net business income from tax returns, averaged over two years, which can make DTI higher than expected.
Can I get a mortgage with 50% DTI?
Often yes, through conventional or FHA loans with automated approval and a strong overall file. Expect to need good credit and cash reserves, and make sure the payment fits your actual budget.
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