What DTI ratio do lenders consider acceptable for a mortgage?

Most conventional lenders prefer a back-end DTI below 43%. FHA loans allow up to 50% in some cases. A front-end DTI below 28% is generally considered healthy.

Does my DTI include student loans in deferment?

Yes, for mortgage underwriting most lenders count a percentage of the outstanding student loan balance (often 1%) or the fully amortizing payment even if the loan is in deferment.

How can I lower my DTI quickly?

Pay down revolving debt balances to reduce minimum payments, or increase gross income. Avoid taking on new loans before applying for credit.

Debt-to-Income Ratio (DTI) Calculator

Calculate your debt-to-income ratio (DTI) to see how lenders evaluate your borrowing capacity. Enter your monthly debt payments and gross monthly income to find your front-end and back-end DTI ratios.

By AbraCalc Editorial Team · Reviewed by AbraCalc Methodology Review · Last reviewed: 2026-06-25

Embed this tool on your site

<iframe src="https://abracalc.com/calculator/dti/embed.html" width="340" height="320" style="border:1px solid #e4e7ec;border-radius:12px" loading="lazy"></iframe>

How to use this tool

Enter monthly housing payment (piti), monthly car loan / lease, monthly student loan payment, monthly credit card minimums, other monthly debt payments and gross monthly income in the fields above.
Results update instantly as you type — or click Calculate.
Read your back-end dti (all debts) and the full breakdown beneath it.

⚠ This tool provides general estimates for education only and is not financial, tax or legal advice. Figures may not reflect your situation — verify with a qualified professional.

Formula

Back-End DTI (all debts):

DTI = (Total Monthly Debt Payments / Gross Monthly Income) × 100

Front-End DTI (housing only):

Front-End DTI = (Monthly Housing Payment / Gross Monthly Income) × 100

How it works

The debt-to-income ratio compares your total recurring monthly debt obligations to your gross (pre-tax) monthly income. Lenders use the back-end DTI, which includes all debt payments, as the primary qualification metric. Most conventional lenders prefer a back-end DTI at or below 43%, and a front-end (housing-only) DTI at or below 28%.

Worked example

Homebuyer with $6,000 Monthly Income

Monthly obligations: housing $1,200 + car $300 + student loan $200 + credit card $100 = $1,800 total.
Back-end DTI = ($1,800 / $6,000) × 100 = 30%.
Front-end DTI = ($1,200 / $6,000) × 100 = 20%.
Maximum debt at 43% DTI = $6,000 × 0.43 = $2,580.

Back-end DTI is 30.00%, well within the conventional lending guideline of 43%.

Common mistakes to avoid

Using net (after-tax) income instead of gross monthly income in the denominator — lenders always use pre-tax income, so net income produces a misleadingly high DTI.
Omitting minimum payments on debts not listed on a credit report (e.g., informal personal loans, alimony) when calculating back-end DTI, which can cause loan approval surprises.
Confusing front-end and back-end DTI: including all debts in the front-end ratio or housing costs only in the back-end ratio leads to incorrect thresholds.

Key terms

What is the DTI ratio?: Debt-to-income ratio measures the percentage of your gross monthly income that goes toward recurring debt payments. Lenders use it to assess repayment risk.
What is a good DTI ratio?: Most lenders prefer a back-end DTI below 43%. A DTI under 36% is considered strong, and under 20% is excellent.
What is the difference between front-end and back-end DTI?: Front-end DTI includes only housing costs (principal, interest, taxes, insurance). Back-end DTI includes all monthly debt obligations.
Does DTI use gross or net income?: DTI calculations use gross (pre-tax) monthly income, not take-home pay.

Frequently asked questions

What DTI ratio do lenders consider acceptable for a mortgage?: Most conventional lenders prefer a back-end DTI below 43%. FHA loans allow up to 50% in some cases. A front-end DTI below 28% is generally considered healthy.
Does my DTI include student loans in deferment?: Yes, for mortgage underwriting most lenders count a percentage of the outstanding student loan balance (often 1%) or the fully amortizing payment even if the loan is in deferment.
How can I lower my DTI quickly?: Pay down revolving debt balances to reduce minimum payments, or increase gross income. Avoid taking on new loans before applying for credit.