What DTI do I need to buy a house?

Most approvals land with back-end DTI under 45%. Under 36% gets the easiest approvals and best pricing; FHA and VA files sometimes approve into the 50s with compensating factors like reserves and residual income.

Do lenders use gross or net income for DTI?

Gross (pre-tax) monthly income, verified through pay stubs, W-2s and tax returns. Self-employed borrowers are averaged over two years of returns, with declining income scrutinized.

Does my rent count in DTI?

Rent is not a debt in the back-end ratio, but lenders do verify rental history, and for VA loans your total obligations feed the residual-income test. A history of on-time housing payments strengthens any file.

Will paying off a credit card help my DTI quickly?

Yes — once the lower minimum payment reports (usually within a billing cycle or two), your back-end ratio drops. Your lender can often order a rapid rescore to reflect paydowns during an application.

Debt-to-Income Ratio: The Number That Decides Your Mortgage

Two borrowers with identical incomes get approved for wildly different homes — the difference is usually DTI. Here is exactly how lenders compute it and how to move yours before you apply.

Front-end vs back-end DTI

Front-end (housing) ratio = total monthly housing cost (PITI + PMI + HOA) ÷ gross monthly income. Guideline: ≤28%. Back-end (total) ratio = housing cost + all recurring debts on your credit report (car loans, student loans, card minimums, child support) ÷ gross monthly income. Guideline: ≤36% conservative, with program ceilings higher.

A worked example

Income $95,000/yr ($7,917/mo). Target home's PITI+PMI: $2,400. Car loan $420, student loan $260, card minimums $90 → total debts $3,170. Front-end: 2,400 ÷ 7,917 = 30.3% (slightly hot). Back-end: 3,170 ÷ 7,917 = 40.0% — approvable at many lenders, but it caps the price. Paying off the car frees $420 and drops back-end DTI to ~34.7%, unlocking roughly $60,000 more home. Test your own split in the affordability calculator.

Program ceilings (guidelines, not guarantees)

Conventional: up to ~45–50% back-end with strong credit/reserves via automated underwriting.
FHA: commonly up to ~50%, higher with compensating factors.
VA: 41% is a guideline benchmark, but residual income matters more; approvals above 41% are routine with strong residual income.
USDA: typically 29% front / 41% back, with waivers possible.

What counts — and what does not

Counts: minimum payments on cards (not the balance), installment loans with 10+ months remaining, student loans (using actual or calculated payments), support obligations, and other property taxes/insurance on homes you own. Does not count: utilities, groceries, health insurance, income taxes, subscriptions, or rent (except as housing ratio context for some programs).

Five ways to lower DTI before applying

Pay off small installment debts entirely (a $90/month loan with 8 payments left still counts in full).
Pay cards down — minimums fall with balances.
Increase documented income (a co-borrower, or document part-time/bonus income with a 2-year history).
Lower the target payment — more down payment or a lower-tax area (see the state calculators).
Choose a program with a higher ceiling if your file is otherwise strong.

Once DTI is in range, follow the pre-approval process and verify payments with the payment calculator.