Debt-to-Income Ratio: What Lenders Look For
Your debt-to-income ratio, or DTI, is one of the first numbers a mortgage or loan underwriter looks at. It answers a simple question: how much of your income is already committed to debt payments before you take on a new one?
Key takeaways
- DTI = total monthly debt payments ÷ gross monthly income × 100.
- Front-end DTI counts only housing costs; back-end DTI counts all debt payments.
- With $6,500 gross income, a $1,900 housing payment and $800 of other debts, back-end DTI is 41.5%.
- Many conventional mortgages look for 36% or less, with exceptions up to about 45–50% for strong applications.
How to calculate it
DTI = total monthly debt payments ÷ gross monthly income × 100
Gross monthly income is your income before tax: your annual salary divided by 12, plus other regular, documented income. Monthly debt payments are the minimum required payments on your obligations, not what you choose to pay.
Typically included:
- Housing: the new mortgage payment including property tax, insurance and HOA dues (or rent for some loan types)
- Car loans and leases
- Student loans
- Minimum payments on credit cards
- Personal loans, and court-ordered payments such as child support
Not included: groceries, utilities, phone bills, subscriptions, insurance unrelated to the home, and income taxes.
Front-end vs back-end DTI
Front-end DTI (the housing ratio) counts only housing costs. Back-end DTI counts housing plus every other debt payment. When lenders say “DTI” without qualification, they usually mean back-end.
A worked example
| Item | Monthly amount |
|---|---|
| Gross income ($78,000 a year) | $6,500 |
| New mortgage payment incl. tax and insurance | $1,900 |
| Car loan | $450 |
| Student loan | $250 |
| Credit card minimum payments | $100 |
- Front-end DTI: $1,900 ÷ $6,500 = 29.2%
- Back-end DTI: ($1,900 + $450 + $250 + $100) ÷ $6,500 = $2,700 ÷ $6,500 = 41.5%
A ratio of 41.5% may still be approved for some loans, especially with good credit and savings, but it leaves little room for error. Paying off the $450 car loan before applying would bring it down to 34.6%.
Add your own income and payments to see your front-end and back-end ratios, then test which debt to clear first.
What ratios do lenders look for?
Limits depend on the loan program, your credit score, your down payment and your cash reserves, so treat these as general ranges rather than rules:
- Conventional mortgages (Fannie Mae and Freddie Mac): a common benchmark is 36% back-end, with approval possible up to about 45%, and up to 50% through automated underwriting for strong applications.
- FHA loans: often around 43%, sometimes higher with compensating factors.
- Personal loans and credit cards: each lender sets its own threshold; lower ratios get better offers.
A frequently quoted planning guideline is the 28/36 rule: keep housing under 28% of gross income and all debt under 36%. It is not a lending requirement, but it is a sensible personal ceiling.
Lender-approved is not the same as affordable
DTI is based on gross income, yet you pay your bills from take-home pay after tax, retirement contributions and insurance. At a 43% back-end DTI, debt payments could take well over half of your net pay. Before borrowing up to a lender’s limit, check the payment against your real monthly budget. Our guide to gross vs net pay shows how big that gap can be.
How to lower your DTI
Reduce the monthly debt side
- Pay off loans with the largest monthly payments first if you are close to applying, even if their balances are small.
- Avoid new debt such as a car loan or store card in the months before a mortgage application.
- Refinance or consolidate to lower required payments, if it does not simply stretch the debt out.
- For a longer-term plan, use the avalanche or snowball method.
Raise the income side
- Include all regular, documented income: overtime, bonuses or side income with a two-year history often count.
- A co-borrower’s income can be added, together with their debts.
Change the new loan
- A larger down payment or a cheaper home lowers the housing payment directly.
- Rate shopping matters: a lower rate reduces the payment that goes into the ratio.
Frequently asked questions
Is DTI calculated on gross or net income?
Lenders use gross monthly income, before tax and other deductions. That is why a DTI that looks acceptable to a lender can still feel tight in your actual budget.
Do utilities and groceries count in DTI?
No. DTI counts recurring debt obligations that appear on a credit report or loan application, such as mortgage or rent in some cases, car loans, student loans, minimum card payments and child support. Everyday living costs are not included.
Does paying off a credit card lower my DTI?
It lowers it by that card’s minimum payment. Paying off a debt with a large monthly payment, such as a car loan near its end, often has a bigger effect than paying down a big card balance with a small minimum.
Does DTI affect my credit score?
Not directly. Credit scores do not include income. But the debts behind your DTI, and how much of your credit limits you use, do affect your score.
Sources
- Consumer Financial Protection Bureau: What is a debt-to-income ratio?
- Fannie Mae Selling Guide: Debt-to-Income Ratios (B3-6-02)
This guide is general information to help you understand the numbers. It is not financial, tax or legal advice. Rates, limits and rules change, so check official sources or a qualified adviser before making a decision. Read our full disclaimer.