Debt-to-Income Ratio Calculator

There is no single pass/fail number, but the practical answer is 43% or lower for most loans, and under 36% for the best approval odds and pricing. Those two figures come from how mortgage underwriting actually works.

• 36% is the comfort target. Conventional underwriters treat a back-end DTI under 36% — paired with a front-end (housing-only) ratio of 28% or less — as a clean approval. You qualify on rate, not on borderline judgment calls.
• 43% is the practical ceiling.It is a lender convention rather than a hard legal cap. Until 2021 the Consumer Financial Protection Bureau's General Qualified Mortgage definition capped DTI at 43%; that limit was replaced with a price-based test comparing the loan's APR to the average prime offer rate. Underwriting guidelines kept the 43% habit, so it is still the line most borrowers feel.
• Above 43%, you need an automated approval. Fannie Mae will go to 50% through its automated system, and FHA and VA stretch further still — but you are relying on compensating factors like reserves or a high credit score, not on the ratio itself.

Underwriters read bothratios, and the calculator above reports both. The front-end ratio counts only the roof; the back-end ratio counts the roof plus every other required payment. When you're testing a mortgage scenario, enter the proposed house payment — principal, interest, taxes, and insurance — in the housing field rather than your current rent.

DTI is a ratio, so you can only move it two ways: shrink the debt payments on top or grow the income underneath. Before a loan application, these are the fastest levers, roughly in order of impact:

• Pay off a credit card to zero. A card minimum is about interest plus 1% of the balance, so clearing a card removes its entire payment from the numerator — a much bigger swing than the same dollars on an installment loan. Time it with the credit card payoff calculator, and target small balances first, the debt snowball way, to knock out whole payments fastest.
• Ask about excluding a near-finished loan.Many lenders let you leave out an installment loan with 10 or fewer payments remaining. If you're close, that payment can drop off your DTI entirely.
• Consolidate to a lower combined payment. Rolling several debts into one loan can cut your monthly outflow if the new payment beats the sum it replaces — run it through the debt consolidation calculator first, because stretching the term to get there usually costs more total interest.
• Don't open new credit before you apply. A financed car or a new card adds a payment to the numerator and can move you from approvable to declined overnight.
• Document more income. A 10% raise drops DTI by about 10%. Lenders count W-2 base pay immediately; bonus, commission, and side income usually need a two-year history.

For a full step-by-step on shrinking the debt side, see how to pay off debt fast.

The same ratio gets judged against different ceilings depending on which program you apply to. These are the published guidelines — individual lenders layer stricter "overlays" on top, so treat them as the outer edge, not a promise.

Conventionalloans anchor on 28/36, but Fannie Mae's automated underwriting will approve a back-end ratio up to 50%. Manually underwritten files start at 36% and only reach 45% with a qualifying credit score and cash reserves.

FHA publishes 31/43 as the baseline. Each compensating factor buys room: one factor moves the limits to 37/47, and two or more move them to 40/50. Compensating factors are things like verified cash reserves, a minimal increase in housing payment, or residual income.

VA loans have no hard DTI cap at all. The VA uses 41% as a screening threshold and leans on a residual income test — how many dollars are left each month after the mortgage, debts, and taxes. Push past 41% and the file must show residual income exceeding the regional guideline by at least 20%. A veteran with a 48% DTI and strong residual income can be a cleaner file than one at 40% without it.

Note which ratio each program constrains. FHA and conventional cap housing separately from total debt, so a modest house payment paired with a large car loan can clear the front-end test and still fail the back-end one. The calculator above reports both so you can see which is binding.

They measure two different things, and a lender checks both because neither one answers the whole question. Your credit score is a track record — have you repaid borrowed money reliably in the past? Your DTI is a capacity test — can you afford the payment on what you want to borrow now?

Neither rescues the other. A 780 credit score won't save a 50% DTI application, because the income to cover the new payment simply isn't there. And a pristine 20% DTI won't save a score in the 500s, because the lender doubts you'll pay at all. Both have to clear the bar.

Which one is your binding constraint depends on your profile. Higher earners with thin or short credit files usually clear the score test easily and bump into DTI as the ceiling. Borrowers recovering from past delinquencies usually have manageable DTI but find their score is what holds approval back. Run your number in the calculator above, check your score separately, and fix whichever is closer to the line first — the good news is that paying down revolving balances improves both at once, since it lowers your DTI and your credit utilization in the same move.