How Much House Can You Afford?

Approval is not the same as affordability

A lender will tell you the maximum loan they are willing to give you. That number is useful, but it answers a different question than the one that matters. The lender is asking "what is the most we can let this person borrow?" You should be asking "what payment can I live with comfortably while still doing everything else I care about?"

Those two numbers are rarely the same. Borrowing all the way to the limit is how people end up house-rich and cash-poor, with a home they technically afford and a budget that never breathes. Affordability is about the second number.

How lenders estimate what you can borrow

Most affordability math starts with your debt-to-income ratio, or DTI. The common guideline is that your total monthly debt payments, including the new mortgage, should stay under roughly 36% of your gross monthly income. Some loan programs allow more, but 36% is a reasonable planning baseline.

Work backward from there and you get a usable estimate:

1. Take 36% of your gross monthly income. That is your ceiling for all debt payments combined.
2. Subtract your existing monthly debts, like car loans, student loans, and credit card minimums.
3. What remains is roughly the housing payment you can support.
4. Convert that payment into a loan amount using current rates and your term, then add your down payment to get a home price.

This is why two people with the same salary can afford very different homes. Someone with a car loan and student debt has far less room left over than someone debt-free, even before the down payment enters the picture.

The levers that actually move your number

A few inputs do most of the work:

• Your other debts. Paying down or eliminating a monthly payment frees up room dollar for dollar, and can raise the price you qualify for without earning a cent more.
• Your down payment. A larger down payment lowers the loan you need and the price you can reach. It can also help you avoid mortgage insurance.
• The interest rate. A higher rate raises the cost of every borrowed dollar, shrinking the loan a given payment can support. Small rate changes move affordability more than people expect.
• The loan term. A longer term lowers the monthly payment, which raises the price you qualify for, but at the cost of much more total interest.

Notice that improving your debts or down payment often helps more than chasing a slightly lower rate.

The costs the headline number leaves out

A simple affordability estimate usually focuses on principal and interest. The real monthly cost of owning is higher, and ignoring the extras is how budgets get blindsided:

• property taxes
• homeowners insurance
• HOA dues, if any
• maintenance and repairs, which average a meaningful percentage of the home's value each year
• higher utility bills than a smaller rental

Because of this, treat any affordability result as an upper bound. The price that fits your loan is not the same as the price that fits your life once these ongoing costs are included.

Renting versus buying is part of the same question

Affordability is not only "how much house," it is sometimes "should I buy at all right now." Buying carries large upfront costs and early payments that are mostly interest, so the benefits of ownership take time to show up.

The single biggest factor is how long you plan to stay. The longer your time horizon, the more buying tends to win, because each year builds equity and gives appreciation time to work, while rent payments leave for good. A short expected stay often favors renting, since transaction costs can erase any gains before equity has a chance to build.

If you are unsure whether to buy at all, comparing the long-run net cost of renting against buying for your specific timeline is often more revealing than an affordability number alone.

A healthier way to set your budget

Rather than borrowing to the maximum, work the problem from your life outward:

• Decide what monthly payment leaves room for saving, investing, and normal spending.
• Include taxes, insurance, and a maintenance cushion in that payment, not just principal and interest.
• Let that comfortable payment, plus your down payment, set the price range you shop in.

A home you can afford and still fund the rest of your goals is worth more than the largest one a lender will approve.

Related next steps

Use the Home Affordability Calculator to estimate a realistic price from your income, debts, and down payment, the Rent vs Buy Calculator to compare the two paths over your expected timeline, and the Mortgage Calculator to pressure-test the all-in monthly payment.