Buying a home is one of the biggest financial decisions most people make. A common question is:
How much mortgage can you actually afford?
The answer depends on several factors including your income, debt, interest rates, and down payment. Understanding these factors can help you avoid buying a home that stretches your budget too far.
In this guide, we’ll explain the main rules lenders use, show real examples, and help you estimate a realistic mortgage budget.
Mortgage affordability depends on several financial factors. Lenders evaluate these to determine whether a loan is safe to approve.
The most important factors are:
Even small differences in these numbers can significantly change how much house you can afford.
One of the most common guidelines lenders use is called the 28/36 rule.
This rule suggests that:
This rule helps lenders reduce the risk that borrowers will struggle to make their payments.
Another important number lenders use is the debt-to-income ratio (DTI).
This measures how much of your monthly income goes toward debt payments.
DTI formula:
Most lenders prefer a DTI below 36%–43%.
Interest rates have a huge impact on the monthly payment for a mortgage. Even a small change can significantly change how much home you can afford.
Higher interest rates reduce how much home you can comfortably afford.
Learn more about how rates affect borrowing in What Is a Good Interest Rate in 2025?.
Your down payment also affects your mortgage affordability.
A larger down payment reduces:
Many lenders also require private mortgage insurance (PMI) if the down payment is below 20%.
Let’s look at a realistic affordability example.
Actual results vary depending on taxes, insurance, and loan terms.
Use the Mortgage Calculator to test different price scenarios.
Many first-time homebuyers focus only on the mortgage payment. However, the true monthly housing cost usually includes several additional expenses.
These costs can add several hundred dollars to the monthly budget.
That’s why it’s important to look at the full housing cost, not just the loan payment.
Many buyers overestimate what they can safely afford.
Common mistakes include:
A mortgage that looks affordable on paper may still feel stressful if it leaves no room in your monthly budget.
Mortgage payments include several components:
You can learn more in the guide:
How Mortgage Payments Are Calculated
Many financial planners recommend staying below the maximum allowed by lenders.
Consider these guidelines:
Buying slightly below your maximum affordability can provide valuable financial flexibility.
Determining how much mortgage you can afford is about more than just the home price. Your income, debts, interest rates, and down payment all affect the final monthly cost.
Using rules like the 28/36 guideline and running different scenarios with calculators can help you choose a home that fits comfortably within your budget.