See the two ratios lenders look at: the front-end ratio (housing costs ÷ gross income) and the back-end ratio (housing plus every other monthly debt payment ÷ gross income) — with the band each ratio falls in, and how much housing and total debt your income supports at the common 28% and 36% guide limits. Everything updates live in your browser; the defaults are the worked example.
Bands are general guidance, not a lending decision: many lenders treat a back-end ratio at or under 36% as healthy, 37–43% as workable, 44–49% as tight and 50%+ as high — but cut-offs vary by lender, loan type and the rest of your application. Housing alone is commonly compared with a 28% guide.
The same bands lenders commonly quote for the back-end ratio. Your row is highlighted.
| Back-end DTI | Band | What it usually means |
|---|---|---|
| 36% or under | Generally healthy | Debt payments sit comfortably inside income for most lenders. |
| 37% – 43% | Workable | Often still approvable, especially with a strong credit profile or savings. |
| 44% – 49% | Tight | Many lenders push back here; paying a debt down can move you a band. |
| 50% or over | High | Half or more of gross income is committed before living costs — most lenders decline. |
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Front-end and back-end debt-to-income ratios from your housing costs, other monthly debts and gross income — with lender band labels and the 28% / 36% guide limits for your income.
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Work out the two debt-to-income ratios lenders use: the front-end ratio (monthly housing costs ÷ gross monthly income) and the back-end ratio (housing plus every other monthly debt payment ÷ gross monthly income), each with its band, plus the maximum housing payment at 28% of income and the maximum total debts at 36% of income.
On a gross monthly income of $7,500 with housing costs of $1,850 (mortgage $1,450 + taxes $200 + insurance $125 + HOA $75) and $620 of other monthly debts (car $320 + card minimums $150 + student loan $150), the front-end ratio is $1,850 ÷ $7,500 = 24.67% and the back-end ratio is ($1,850 + $620) ÷ $7,500 = $2,470 ÷ $7,500 = 32.93% — inside the “generally healthy” band. The guide limits on this income are housing of 28% × $7,500 = $2,100 and total debts of 36% × $7,500 = $2,700, leaving $2,700 − $2,470 = $230 a month of room under 36%.
Front-end ratio = monthly housing costs ÷ gross monthly income × 100, where housing is rent, or mortgage payment + property taxes + home insurance + HOA dues (count escrowed taxes and insurance once). Back-end ratio = (housing + all other required monthly debt payments) ÷ gross monthly income × 100. Credit cards count at their minimum payment, not the balance. The guide limits are simple percentages of the same income: 28% for housing, 36% for total debts. The bands shown (36% or under generally healthy, 37–43% workable, 44–49% tight, 50% or over high) are the ranges lenders commonly quote for the back-end ratio.
As general guidance, a back-end DTI of 36% or under is the range most lenders call healthy, 37–43% is workable, 44–49% is tight and 50% or over is high. Housing alone (the front-end ratio) is commonly compared with a 28% guide. These are conventions, not rules — individual lenders set their own cut-offs.
Any required monthly payment on money you owe: mortgage or rent (with taxes, insurance and HOA for housing), car loans, student loans, credit-card minimum payments, personal loans, child support and similar obligations. Everyday bills — utilities, groceries, phone, subscriptions — do not count, even though they matter for your budget.
Gross — income before tax and deductions — because that is what lenders use. If you only know your annual salary, use the per-year toggle and the calculator divides by 12. Using take-home pay instead would make your ratios look worse than a lender would calculate them.
The front-end ratio isolates housing: can this income carry this home? The back-end ratio is the fuller picture: housing plus every other debt payment. A borrower can pass the front-end test and still fail the back-end one because of a car loan or card minimums — which is why lenders quote both.
The fastest levers are paying off a small debt completely (its whole monthly payment leaves the ratio, not just part of the balance), avoiding new finance before applying, and — for credit cards — paying the balance down, since the minimum payment usually falls with it. A higher income helps too, but lenders generally need it documented.
No — it is a long-standing underwriting guideline, not a regulation. Many modern loan programmes approve back-end ratios above 36%, sometimes above 45%, when other factors are strong. The calculator shows the 28% and 36% figures as reference limits so you can see where you stand against the classic benchmark.
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