The Number That Actually Determines What You Can Afford
Your debt-to-income ratio (DTI) might be more important than your credit score when it comes to how much you can borrow. Here is what it is, why it matters, and how to improve it.
What Is DTI and Why Does It Matter?
Your debt-to-income ratio is your total monthly debt payments divided by your gross monthly income (before taxes). It tells lenders whether you have enough income left over to handle a mortgage payment.
A borrower earning $6,000/month with $2,400 in total monthly debts (including the proposed mortgage) has a DTI of 40%. That same borrower with $3,000 in debts has a 50% DTI — and suddenly faces program restrictions.
The Formula
DTI = (Total Monthly Debt Payments ÷ Gross Monthly Income) × 100
Lenders calculate two versions of DTI: front-end (housing expenses only) and back-end (all debts combined). The back-end number is what matters most for qualification.
Calculate Your DTI
DTI Calculator
Enter your monthly amounts to see your front-end and back-end DTI ratios. This is for educational purposes only — a loan officer can provide a precise calculation.
Front-End DTI
0.0%
Housing only
Back-End DTI
0.0%
All debts
What Counts as Debt (and What Does Not)
Counts Toward DTI
- •Proposed mortgage payment (PITI)
- •Car loan/lease payments
- •Student loan payments
- •Credit card minimum payments
- •Personal loan payments
- •Child support / alimony
- •Other installment debts
Does NOT Count
- •Utilities (electric, gas, water)
- •Cell phone bill
- •Groceries and food
- •Subscriptions (Netflix, etc.)
- •Health/auto insurance premiums
- •Current rent (replaced by mortgage)
- •Income taxes
DTI Limits by Loan Program
| Program | Front-End Max | Back-End Max |
|---|---|---|
| Conventional | 28% | 45-50% |
| FHA | 31% | 43-50% |
| VA | N/A | 41%+ (flexible) |
| USDA | 29% | 41% |
These are general guidelines. Actual limits vary by lender, compensating factors, and automated underwriting findings.
How to Lower Your DTI Before Applying
Pay off small debts entirely
Eliminating a $200/month car payment drops your DTI more than paying down a credit card by $200. Target debts with the highest monthly payments relative to their balance.
Increase your income
A raise, overtime, or a documented side job all increase the denominator in your DTI calculation. Lenders typically need two years of history for self-employment income.
Choose a less expensive home
A lower purchase price means a lower mortgage payment, which directly reduces your front-end and back-end DTI.
Avoid taking on new debt
That new car or furniture financing increases your DTI. Wait until after closing.
Consider a co-borrower
Adding a spouse or partner with income can lower the combined DTI. Both credit profiles will be evaluated.
Frequently Asked Questions
What is a good DTI ratio for a mortgage?
Most lenders prefer a total DTI (back-end) of 43% or below. FHA allows up to 50% with compensating factors. VA loans can be more flexible. A front-end DTI (housing costs only) below 28% is generally considered comfortable.
What debts count toward DTI?
Monthly minimums on credit cards, auto loans, student loans, personal loans, child support, alimony, and your proposed housing payment (PITI). Utilities, groceries, subscriptions, and insurance premiums typically do not count.
Can I lower my DTI quickly?
Yes. The fastest approaches are paying off or paying down debts with monthly payments, increasing your income (overtime, a raise, a side job with documented history), or choosing a less expensive home to lower your proposed housing payment.
Does rent count toward DTI?
Your current rent does not count toward DTI because it will be replaced by your new housing payment. Only the proposed mortgage payment (PITI) is included in the housing expense calculation.
Know Your Numbers
Take the free readiness assessment to see how your DTI, credit, and savings stack up against program requirements.
AMLO is an educational platform and does not originate, fund, or service mortgage loans. AMLO is not a lender, broker, or bank. The DTI calculator above is for educational purposes only and may not reflect your actual qualification. A licensed loan officer can provide an accurate DTI calculation based on your complete financial picture. Equal Housing Opportunity.