Debt-to-Income Ratio Calculator
↻ Updated 2026Lenders judge you on your debt-to-income ratio. Calculate your front-end and back-end DTI and see how it stacks up against the 28% / 36% guideline.
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How to read your front-end and back-end DTI
Back-end DTI is the number lenders actually underwrite to — 33.6% here, against $7,000 of gross income. Front-end is the housing-only slice at 22.9%. Both are calculated on gross pay, which is why your DTI can look comfortable while your bank balance doesn't: the ratio is measured before the tax that never reaches you.
How lenders build the 28/36 rule out of your payslip
Both ratios are one division. Front-end is your housing payment over gross monthly income; back-end adds every other required monthly debt payment to the numerator. The 28/36 guideline says the first should stay at or below 28% and the second at or below 36% — two thresholds that originated as conventional underwriting convention rather than as law.
The subtlety is entirely in what counts. The numerator is debt payments, not spending: a mortgage or rent, car loans, credit card minimums, student loans, personal loans, and court-ordered obligations like child support or alimony. Groceries, utilities, insurance premiums, phone bills and childcare are excluded — not because they're optional, but because DTI is built to measure your capacity to service borrowing, not your cost of living. Two households with identical DTI can have wildly different amounts of money left over, and the ratio cannot see the difference.
front-end DTI = housing payment ÷ gross monthly income back-end DTI = all monthly debt payments ÷ gross monthly income where all monthly debt payments = housing + car + card minimums + other debt guideline: front-end ≤ 28%, back-end ≤ 36% room before 36% = (36% − back-end DTI) × gross income
- gross monthly income
- Your pay before tax and every deduction — gross, not take-home — this is the lender's convention and the CFPB's definition, and it flatters every ratio on this page
- housing payment
- Rent, or mortgage principal and interest plus taxes, insurance and HOA — for a mortgage this is PITI, not just the loan payment — leaving out taxes and insurance understates your front-end materially
- card minimums
- The minimum due on your cards, not what you actually pay — lenders use the minimum shown on the statement, so paying your cards in full doesn't lower your DTI
- other debt
- Student loans, personal loans, child support, alimony — required monthly obligations; living expenses like utilities and groceries are excluded by design
- back-end DTI
- Total debt payments over gross income — the ratio that decides most lending decisions — front-end is secondary almost everywhere
Deferred and unusual debts are where real underwriting diverges from any calculator. A student loan in deferment still counts — Fannie Mae's guidelines require a payment to be imputed from the balance if none is currently reported, so a loan you're not paying can still cost you the approval. Meanwhile a car loan with four payments left may be excluded entirely by some programs.
The two thresholds are also not equally binding. Back-end is what nearly every lender underwrites to; front-end is a secondary check many programs don't enforce separately at all. If you track one number, the hero card is the one.
Worked examples
Example: $7,000 a month with $2,350 of debt payments
The calculator's defaults. Gross income of $7,000 a month, a $1,600 housing payment, a $400 car loan, $200 of card minimums and $150 of other debt.
| Total monthly debt$1,600 + $400 + $200 + $150 | $2,350 |
| Front-end DTI$1,600 ÷ $7,000 — under the 28% guideline | 22.9% |
| Back-end DTI$2,350 ÷ $7,000 — under the 36% guideline | 33.6% |
| Ratingwithin the 36% manual-underwriting benchmark | Strong |
| Room before 36%of additional debt payments | $170/mo |
| Income left after debtbefore tax, and before living costs | $4,650 |
Both ratios pass, and the profile reads Strong. But look at the headroom: $170 a month before the back-end hits 36%. That's the real constraint the ratio expresses — this household would clear a mortgage underwriter comfortably today and could not add an average car payment without breaching the guideline. And the $4,650 "left" is gross. Tax comes out of it before a single grocery does, which is the thing DTI structurally cannot show you.
Example: raising housing to $1,950 — where 28 and 36 disagree
Move the housing slider to $1,950 and change nothing else. Front-end climbs toward its limit; watch what happens to the other number.
| Front-end DTI$1,950 ÷ $7,000 — still under 28% | 27.9% |
| Back-end DTI$2,700 ÷ $7,000 — now over 36% | 38.6% |
| Ratingno longer Strong | Acceptable |
| Room before 36%the headroom is gone | Over the limit |
| Total monthly debtup $350 | $2,700 |
The front-end guideline still passes at 27.9% while the back-end has broken through 36%. The two halves of the 28/36 rule disagree, and this is the normal case rather than an edge case: front-end only binds for people with almost no other debt. With $750 a month of car and card payments, this household hits the total-debt ceiling before it hits the housing one — which means the constraint on how much house it can afford is the car loan, not the mortgage.
Frequently asked questions
What is a good debt-to-income ratio?
The conventional guideline is 28% front-end and 36% back-end, and 36% or below is what lenders describe as strong. The defaults here — 22.9% and 33.6% — sit inside both.
Treat these as convention, not law. They're underwriting rules of thumb that predate most of the programs now using them, and actual limits are considerably more generous. What 36% really represents is the point beyond which lenders start wanting compensating factors — a higher credit score, cash reserves — rather than a cliff you fall off.
Does debt-to-income ratio use gross or net income?
Gross — your income before taxes and deductions, as the CFPB defines it and as every mainstream lender computes it. This calculator's income field says so, and it matters more than it sounds.
The consequence is that DTI systematically understates the pressure you're under. A 36% back-end on gross income can be well over half your take-home once federal and state tax, FICA, health premiums and retirement contributions come out — none of which appear anywhere in the ratio. A borrower at 36% in a high-tax state with a full 401(k) deferral is in a materially tighter spot than one at 36% in a no-income-tax state, and DTI scores them identically.
Does rent count in your debt-to-income ratio?
It depends on what you're applying for, which is why the answer people find online contradicts itself. For a personal loan, a card, or an auto loan, your rent counts as a housing payment and belongs in the numerator — that's the calculation on this page.
For a mortgage on your primary residence, your current rent is excluded, because the new mortgage payment replaces it. The lender computes your DTI with the proposed PITI in the housing slot, not your current rent. So if you're modelling a home purchase here, put the expected mortgage payment — principal, interest, taxes, insurance and HOA — in the housing field rather than what you pay your landlord today.
What is the maximum debt-to-income ratio for a mortgage?
Higher than 43%, and the 43% figure is more out of date than most sources admit. It was the hard ceiling for a General Qualified Mortgage until the CFPB's General QM Final Rule removed the DTI limit outright, replacing it with a price-based test — the loan's APR against the average prime offer rate, with a conclusive presumption of compliance below APOR + 1.5 percentage points and a rebuttable one below APOR + 2.25. Mandatory compliance was 1 October 2022. Lenders must still consider your DTI, and it still decides plenty of applications; they are simply no longer bound to 43% by that rule.
The limits that actually bind are program-specific and considerably looser. Fannie Mae's Selling Guide B3-6-02 caps manually underwritten conventional loans at 36%, rising to 45% with qualifying credit scores and reserves, and allows up to 50% through Desktop Underwriter. FHA's benchmark ratios are 31/43, rising to about 40/57 with automated underwriting and compensating factors. VA has no fixed ceiling and turns on residual income instead.
The guideline rows on this page show those program limits rather than a single number, because there is no longer a single number to show.
How can I lower my debt-to-income ratio?
Only two levers exist, since it's one division: reduce the monthly payments in the numerator, or raise the gross income in the denominator. What's worth knowing is which debts are efficient to attack, and it isn't the ones that cost the most.
DTI counts payments, not balances or rates — so clearing the $400 car loan drops the back-end from 33.6% to 27.9%, while clearing $200 of card minimums moves it to 30.7% despite the cards charging far more interest. The debt that's cheapest to carry can be the most expensive to your ratio. That's a direct conflict with paying off debt by cost, which the debt payoff calculator orders properly — if you're optimising for an approval, the two goals genuinely pull apart.
What your DTI ratio can't see
DTI is a blunt instrument by design — it's cheap to compute from documents a lender already has. That economy costs it most of what matters about your finances.
- It's blind to tax, and to everything you actually spend — Gross income in the denominator, debt payments only in the numerator. Utilities, groceries, childcare, insurance premiums, retirement contributions and the tax itself are all invisible. Two borrowers at 33.6% with the same gross pay can have hundreds of dollars a month between them in what's genuinely left.
- It counts payments, not what the debt costs — A 22.9% card at a $200 minimum and a 4% student loan at a $200 payment are identical to this ratio. One is ruinous and one is nearly free. DTI measures cash-flow obligation, not the price of the money.
- Deferred and imputed payments aren't modelled — A student loan in deferment shows a $0 payment but underwriters will impute one from the balance under Fannie Mae's guidelines. Conversely, some programs exclude debts with fewer than ten payments left. Both cases would change your real ratio and neither can be entered here.
- 28/36 is a convention, and the old 43% rule is gone — 28/36 is underwriting convention, not law. The 43% figure many sources still quote as a hard ceiling was the General Qualified Mortgage DTI limit until the CFPB replaced it with a price-based APR test in October 2022. The limits this page shows instead — 45% and 50% on conventional loans, 57% on FHA with AUS — are program guidelines that lenders apply with discretion and compensating factors, so your own ceiling depends on who is underwriting and how.
- No credit score, assets or employment history — DTI is one input among several and rarely decisive alone. Reserves, score, down payment and income stability all move a decision this ratio only partly describes — which is why borrowers above 36% are approved every day.
- ·Fannie Mae Selling Guide B3-6-02 — Debt-to-Income Ratios — 36% manual, 45% with qualifying credit and reserves, up to 50% via Desktop Underwriter
- ·HUD Handbook 4000.1 — FHA qualifying ratios — 31% / 43% benchmark, up to 40% / 57% with automated underwriting
- ·CFPB General QM Final Rule (12 CFR § 1026.43(e)(2)) — replaced the 43% DTI limit with a price-based APR test (APOR + 1.5pp conclusive / + 2.25pp rebuttable); mandatory compliance 1 Oct 2022
Rates, brackets and limits here are checked against primary sources. If a number still looks off, email support@realmoneyiq.com and we'll review and fix it.
RealMoneyIQ provides free educational calculators, not financial, tax, investment or legal advice. Results are estimates based on the assumptions you enter and publicly published rates; your actual outcome will differ. Always confirm decisions with a licensed professional who knows your full situation.