Buying a home is likely the largest financial commitment you’ll ever make. Understanding your buying power means evaluating income, debts, expenses, down payment, interest rates, and more. Here’s a step-by-step guide to help you make confident decisions.
1. Income & Debt-to-Income (DTI) Ratios
Lenders analyze your ability to repay loans using DTI ratios:
Housing ratio (front-end): Ideally, no more than 28–30% of gross monthly income goes toward mortgage payments
Total debt ratio (back-end): Including all debts (car, credit cards, student loans) should stay within 36–43% of gross monthly income
Example: A $5,000 gross monthly income:
Max housing cost ~ $1,400 (28%)
Max total debt ~ $1,800 (36%), leaving ~$400 for other debts
Save for larger down payment, aiming for 20% to reduce PMI and improve terms
Shop lenders—compare rates/fees with at least three providers
Build emergency savings—aim for 3–6 months of housing and debt costs
Sample Affordability Table
Annual Gross Income
Max House Price (2.5×)
36% Rule Monthly Payment
Est. Affordability*
$60,000
$150,000
$1,800
~$308,000
$80,000
$200,000
$2,400
~$462,000
$120,000
$300,000
$3,600
~$666,000
*Based on SmartAsset using DTI and income assumptions
FAQ
What’s the ideal monthly income ratio for a mortgage?
28–30% for mortgage only; 36–43% including all debts
Can I afford with a 10% down payment?
Yes—but expect PMI. Boost down payment to 20% to avoid extra costs.
What lender mistakes to avoid?
Don’t wait too long to lock in rates, compare only one lender, request pre-qual rather than pre-approval, shuffle money around, or change jobs during processing.
Use monthly gross income + DTI to set a smart housing budget.
Factor in all housing and ownership costs.
Boost affordability via savings, paying down debt, and shopping lenders.
Try our 2025 Affordability Calculator today to plan smarter!
By assessing income, debts, rates, down payment, and extra costs—and using a modern calculator—you can confidently determine how much home you can realistically afford in 2025.
Our advice is based on experience in the mortgage industry and we are dedicated to helping you achieve your goal of owning a home. We may receive compensation from partner banks when you view mortgage rates listed on our website.