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What is a debt-to-income ratio?
Your debt-to-income (DTI) ratio is your total monthly debt payments divided by your gross monthly income, as a percentage. Lenders use it to gauge how much of your income is already committed — it counts debt payments, not living costs like groceries or utilities.
The full answer
The definition
Debt-to-income ratio (DTI) is the share of your gross (pre-tax) monthly income that goes to required monthly debt payments. The formula is simple division: total monthly debt payments ÷ gross monthly income × 100. A person paying $2,300 of debt out of $6,000 gross income has a DTI of about 38%.
What counts as "debt" in the numerator
- Rent or mortgage payment (including property tax + insurance escrow on a mortgage)
- Auto loan payments
- Student loan payments
- Credit-card *minimum* payments (not your balance, not what you actually pay)
- Personal loans and other installment payments with a required monthly amount
What does not count: utilities, groceries, fuel, phone plans, streaming, insurance premiums outside escrow — those are living costs, not debt service. That is why DTI understates how committed a budget really is; it is a lending metric, not a budget.
Front-end vs back-end
| Version | Numerator | Common convention |
|---|---|---|
| Front-end | Housing costs only | ≈28% |
| Back-end | ALL monthly debt payments | ≈36%; 43% in mortgage rules |
The back-end number is what "DTI" means by default. The 43% figure became a reference point because the CFPB's ability-to-repay mortgage rules historically anchored qualified mortgages to a 43% back-end DTI; conventions vary by loan program and have evolved since.
A worked example ($6,000 gross/month)
| Payment | Amount |
|---|---|
| Mortgage (incl. escrow) | $1,500 |
| Car loan | $400 |
| Student loan | $250 |
| Card minimums | $150 |
| Total debt service | $2,300 |
Back-end DTI = 2,300 ÷ 6,000 ≈ 38%. Front-end = 1,500 ÷ 6,000 = 25%.
The two ways the number moves
Because DTI is a fraction, it falls when the numerator shrinks (a debt is paid off, a balance refinanced to a lower payment) or the denominator grows (gross income rises). Paying *extra* on a loan does not lower DTI until the payment itself disappears or is recalculated — the ratio tracks required payments, not balances.
This explains how the lending math works, not personal financial advice. It describes the formula and the conventions — it does not say what ratio is right for you or whether to borrow. For your own situation, a fee-only fiduciary advisor (e.g. via NAPFA) or a nonprofit credit counselor (e.g. via the NFCC) can help.
Cross-reference: see /pages/what-is/zero-based-budget for the budget view that includes the living costs DTI ignores + /pages/what-is/net-worth for the balance-sheet counterpart to this cash-flow metric.
Time ranges by condition
| Condition | Duration | Note |
|---|---|---|
| Formula | Monthly debt payments ÷ gross monthly income × 100 | — |
| Front-end | Housing costs only (≈28% convention) | — |
| Back-end | All debt payments (≈36%; 43% in mortgage rules) | — |
| Counts | Required payments — card minimums, not balances | — |
| Doesn't count | Utilities, groceries, insurance outside escrow | — |
What changes the time
- Gross income. The denominator; a raise lowers DTI with no debt change
- Required payments. The numerator; a paid-off loan removes its full payment
- Card minimums. Only the minimum counts, so card DTI impact is smaller than the balance suggests
- Loan program. Each program sets its own DTI conventions and exceptions
Common questions
Do utilities and groceries count toward my debt-to-income ratio?
No. DTI only counts required monthly debt payments — mortgage or rent, auto loans, student loans, card minimums, and other installment payments. Utilities, groceries, fuel, phone plans, and most insurance are living expenses, not debt service. That makes DTI a lending metric rather than a complete picture of how stretched a budget is — two households with identical DTIs can have very different real margins.
Does paying extra on a loan lower my DTI?
Not immediately. DTI tracks required monthly payments, not balances, so extra principal payments leave the ratio unchanged until the loan is fully paid off (removing its payment), the loan is refinanced or recast to a lower payment, or a card's minimum drops because the balance fell. The two direct levers are eliminating a payment entirely or increasing gross income.
Is DTI calculated on gross or net income?
Gross — pre-tax income is the standard denominator lenders use. That means the published conventions (28% front-end, 36-43% back-end) are all percentages of money you never fully see in your bank account. A DTI that looks moderate against gross income can claim a much larger share of actual take-home pay, which is one reason the lending threshold and a comfortable budget are not the same thing.
Sources
We cite primary research, expert practice, and authoritative reference. Higher-tier sources weighted heavier. See methodology.
- T1Consumer Financial Protection Bureau (CFPB) — "What is a debt-to-income ratio?" — U.S. government definition, what counts, and how lenders use DTI
- T1CFPB — Ability-to-Repay / Qualified Mortgage rule (Regulation Z) — The mortgage rule that made the 43% back-end figure a reference point
- T1National Foundation for Credit Counseling (NFCC) — Nonprofit credit-counseling reference
Cite this page
de Vries, P. (2026). What is a debt-to-income ratio?. AskedWell. Retrieved 2026-06-11, from https://askedwell.com/pages/what-is/debt-to-income-ratio
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