DTI Loan Limit Calculator
Calculate the maximum mortgage you qualify for using your debt-to-income (DTI) ratio. Fannie Mae allows up to 50% DTI via Desktop Underwriter; FHA up to 57% with compensating factors; VA flexible.
Auto, student, credit card minimums, child support — not utilities or groceries.
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How to use
- 1 Enter gross monthly income (pre-tax, all sources averaged).
- 2 Enter total existing monthly debt (auto, student, credit card minimums, alimony, child support — anything on your credit report). Don't include rent/mortgage that will be replaced.
- 3 Choose DTI limit: 36% (conservative), 43% (QM safe harbor), 45% (Fannie manual), 50% (Fannie DU), 56.99% (FHA compensating factors).
- 4 Enter loan APR (mortgage 6.30%, auto 7-10%, personal 13.45%, etc.).
- 5 Enter loan term in months (360 = 30-year, 60 = 5-year auto). Click Calculate to see max loan amount, monthly payment, current DTI, and remaining capacity.
About DTI Loan Limit Calculator
FAQ
Q How is DTI calculated for a mortgage?
Back-End DTI = (total monthly debt) / (gross monthly income) × 100. Includes: housing payment (PITI), auto loan, student loan, credit card minimums, alimony, child support, HOA. Excludes: utilities, insurance not escrow, food, savings.
Q What's the maximum DTI for a mortgage in 2026?
Fannie Mae DU 50% (most common conventional). FHA 56.99% with compensating factors (or 43% standard). VA flexible — uses residual income method. CFPB QM safe harbor: 43%. Lower DTI = better rates.
Q How can I qualify for a bigger mortgage?
Six strategies: (1) Pay off credit card balances 30+ days before applying. (2) Pay off auto loan. (3) Add co-borrower for combined income. (4) Refinance student loans longer term to lower payment. (5) Bigger down payment lowers loan size. (6) Wait for raise/promotion.
Q What is QM safe harbor 43% rule?
CFPB Ability-to-Repay rule: lenders get legal safe harbor from ATR lawsuits if back-end DTI is at or below 43%. Loans above 43% are still QM-compliant under price-based test, but lenders price in extra risk premium (0.125-0.50% rate add-on).
Q Can I get a mortgage with 50% DTI?
YES via Fannie Mae Desktop Underwriter (DU) or Freddie Mac Loan Product Advisor (LPA). Both allow 50% back-end DTI on conventional loans with adequate compensating factors (credit score 680+, reserves, etc.). FHA goes higher (56.99%) with compensating.
Q How is VA loan DTI different?
VA loans don't enforce strict DTI cap. Use residual income method: after deducting all debts + living expenses, monthly residual must exceed VA regional minimums ($1,003 family of 4 in South, etc.). Veterans with 55-60% DTI on paper often qualify.
Q What is front-end vs back-end DTI?
FRONT-END: housing payment (PITI) ÷ income. Conventional cap 28%, FHA up to 46.99%. BACK-END: ALL debts ÷ income. Conventional cap 50% (DU), FHA 56.99%. Lenders use the HIGHER constraint as the binding cap. FHA also has front-end limits.
Q Does paying off credit card help my DTI?
YES — major impact. Each $100/mo minimum payment eliminated frees up roughly $20,000 in mortgage capacity at 6.30% over 30 years. Pay down balances 30+ days before applying so the new lower minimum reports to credit bureaus. Even better: close cards you don't need.
Official resources
Fannie Mae — Selling Guide B3-6-02 (DTI)
Official Fannie Mae underwriting standards confirming 50% maximum back-end DTI for DU conventional loans.
CFPB — DTI and Ability to Repay
Consumer Financial Protection Bureau official explanation of DTI, the 43% ATR rule, and QM safe harbor.
HUD — FHA DTI Standards
HUD/FHA Single Family Handbook covering 31/43 base DTI and 46.99/56.99 expansion with compensating factors.
VA — Lenders Handbook 26-7 Residual Income
US Department of Veterans Affairs Lenders Handbook with residual income tables and DTI methodology.