DTI Calculator

Quick summary

The Debt-to-Income (DTI) ratio is the second-most-important number lenders use after credit score to decide if you qualify for a mortgage. It measures how much of your gross monthly income already goes to debt — and how much capacity you have left for a new house payment.

This calculator returns your front-end DTI (housing only) and back-end DTI (housing + all other monthly debts), then maps your numbers against the actual 2026 underwriting rules: Fannie Mae DU 50%, FHA up to 56.99% with compensating factors, VA residual-income method, CFPB QM safe harbor at 43%.

Use it before you talk to any lender. Borrowers who tighten DTI by 5 points before applying typically save 0.125-0.5% on the mortgage rate, plus they have a meaningful cushion to handle property tax / insurance increases without redlining.

Gross monthly income (pre-tax)

W-2 wages + self-employment + other regular income, BEFORE tax

Proposed PITI (housing)

P&I + property tax + insurance + HOA

Auto loan monthly

Student loan monthly

Credit card minimums

Other monthly debt (alimony, child support, personal loans)

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How to use

1 Enter your gross monthly income (before taxes — use base + bonus + commission averaged over the past 24 months for self-employed).
2 Enter the proposed monthly housing payment (PITI: principal + interest + property tax + homeowner's insurance + HOA + PMI/MIP).
3 Add monthly minimum payments for car loans, student loans, credit cards, alimony, child support — anything that shows on your credit report.
4 Click Calculate to get front-end DTI, back-end DTI, qualification flags for conventional/FHA/VA, and your maximum housing payment under each program.
5 If your back-end DTI exceeds 50%, pay down credit cards or refinance high-rate debt before applying — every dollar of debt removed lifts your buying power by ~$200.

2026 Mortgage DTI Limits — Verified by Program

Underwriting standards differ sharply by loan program. Always model both front-end (housing only) and back-end (all debt) — lenders use the higher of the two as the binding constraint.

Program	Front-End (Housing)	Back-End (Total Debt)	Notes
Fannie Mae DU (Conventional)	No hard cap	50% maximum	Most common — uses Desktop Underwriter automated decision
Fannie Mae Manual	28-36%	36-45% (50% with compensating factors)	Reserves + 720+ score required for >45%
Freddie Mac LP	No hard cap	50% maximum	Loan Product Advisor automated
FHA	46.99%	56.99% (with comp factors)	Strict 31/43 unless reserves, credit 580+, residual income
VA	Flexible	41% benchmark / up to 60% if residual passes	Residual income test — net income after debts must exceed regional minimums
USDA Rural	29%	41%	Income limits also apply (115% area median)
Jumbo	28%	43%	Most jumbo lenders enforce QM safe harbor

Compensating Factors That Let You Exceed Standard DTI

If your DTI exceeds the standard threshold, lenders may still approve you if you bring strong compensating factors. The more you stack, the higher DTI you can carry.

Compensating Factor	How It Helps
Credit score 720+	Lower default risk → permits higher DTI
Cash reserves (3-12 months PITI)	Demonstrates ability to weather income disruption
Minimal payment shock	New PITI close to current rent → behavior already proven
Stable employment (24+ months same field)	Reduces income volatility risk
Significant non-taxable income	Gross-up by 25% under most agency rules
Energy-efficient home	FHA EEM allows ~2% DTI stretch

QM Safe Harbor — Why 43% Still Matters

Although the GSE Patch expired and Fannie/Freddie now allow 50% DTI, the CFPB Qualified Mortgage (QM) Rule still grants lenders safe harbor from the Ability-to-Repay lawsuit risk only when back-end DTI is at or below 43%. Loans above 43% are generally still QM-compliant under the price-based test, but lenders price in extra risk premium — typically 0.125-0.50% rate add-on above 43%.

VA Residual Income — A Different Game

The VA does not enforce a strict DTI cap. Instead, after subtracting all monthly debts and living costs (utilities, food, taxes, child care), the residual income remaining must exceed VA regional minimums (e.g., $1,003 for a family of 4 in the South for loans over $80,000). This is why veterans with 55-60% DTI on paper still qualify when their take-home leaves enough cushion.

FAQ

Q What is a good debt-to-income ratio for a mortgage?

A back-end DTI of 36% or less is excellent and qualifies you for the best rates across all programs. Up to 43% keeps you in the QM safe harbor. Most conventional lenders accept up to 50% via Fannie DU, and FHA goes to 56.99% with strong compensating factors.

Q How do I calculate my debt-to-income ratio?

Add up all your monthly debt payments (mortgage/rent + car + student loan + credit card minimums + child support), divide by your gross monthly income (pre-tax), then multiply by 100. Example: $2,400 debts ÷ $6,000 income = 40% DTI.

Q What is the difference between front-end and back-end DTI?

Front-end DTI uses ONLY your housing payment (PITI) divided by income. Back-end DTI includes ALL monthly debts. Lenders generally focus on back-end DTI but FHA also enforces a front-end cap of around 31-46.99%.

Q Can I get a mortgage with 50% DTI?

Yes. Fannie Mae Desktop Underwriter and Freddie Mac Loan Product Advisor both allow up to 50% back-end DTI on conventional loans, provided your credit score and other factors compensate. FHA goes higher (56.99%) with comp factors.

Q Do utilities count in DTI ratio?

No. DTI only counts debts that appear on your credit report — mortgage, auto loan, student loan, credit card minimums, personal loans, alimony, child support. Utilities, insurance, food, gas, and phone bills are excluded from DTI calculation.

Q What income counts for DTI calculation?

Lenders use stable, documented gross income: W-2 wages, 1099 self-employment averaged over 24 months, base + bonus, commission, rental income (75% credit), Social Security, pension, disability, alimony if 3+ years left. Tip income and overtime require 24-month history.

Q Does paying off a credit card improve my DTI?

Massively. Paying off a $200/month minimum frees up roughly $40,000 in mortgage capacity at 6.5% over 30 years. Pay down revolving balances 30+ days before applying so the lower minimum reports to credit bureaus.

Q What DTI do I need for a VA loan?

VA loans don't enforce a hard DTI cap. They use a residual income test — after subtracting all debts and living expenses, you must have enough cash left over per VA regional tables (e.g., $1,003/month for a family of 4 in the South). Many veterans qualify with 55-60% DTI.