About Mortgage Affordability Calculator (DTI Underwriting)
Professional home affordability underwriting calculator based on Fannie Mae, Freddie Mac, and FHA debt-to-income (DTI) qualification standards. Evaluates Front-End (28% housing ratio) and Back-End (36% to 43% total debt ratio) to determine your maximum home purchase price.
Key Capabilities & Features
- Dual underwriting models: Conservative (28/36 rule) and Aggressive/FHA (31/43 rule) affordability limits
- Back-end DTI debt deduction incorporating student loans, auto financing, and revolving credit cards
- Maximum loan principal and maximum affordable purchase price derivation factoring in cash down payment
- Detailed monthly budget allocation comparing gross income against qualifying housing payment thresholds
- Instant qualification verdict indicating compliance with conventional mortgage lending guidelines
How to Use Mortgage Affordability Calculator (DTI Underwriting)
Enter Gross Income
Input your total annual pre-tax household income.
Add Existing Monthly Debts
Enter recurring monthly obligations like car loans, student debt, and credit card minimums.
Specify Down Payment Cash
Enter your total liquid cash reserves allocated for the property down payment.
Review Maximum Price
Inspect conservative versus aggressive home purchase price boundaries and max monthly PITI.
Privacy & In-Browser Execution Guarantee
100% Client-Side. Income and debt entries are processed locally in your browser memory.
Frequently Asked Questions
What is the 28/36 rule in mortgage underwriting?
The 28/36 rule states that your monthly housing costs (PITI) should not exceed 28% of your gross monthly income (front-end DTI), and your total debt payments combined should not exceed 36% (back-end DTI).
Can I get approved with a debt-to-income ratio above 36%?
Yes, FHA and VA loans routinely approve back-end DTIs up to 43%, and conventional loans with automated underwriting may approve up to 45% or 50% with strong compensating factors.