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Can you afford a home today? Here’s how to calculate your budget

Calculating your monthly income, debts and down payment is the first step in setting a realistic home-buying budget. (Photo: Unsplash)
If you buy a home in 2026, you’ll be looking in a market with a median sale price of about $439,000 and an average 30-year fixed mortgage rate of around 6.37 percent. That rate translates into a principal and interest payment of roughly $2,185 per month, not including taxes or insurance on a $350,000 loan. Those figures make budgeting critical before you start touring listings.
The good news is that you don’t have to be a finance graduate to work out your home budget. Some good rules, honest math about your income and debts, and an honest look at savings will tell you where you are. Tools that combine income, debts and down payment into a realistic price range can help buyers get a quick start on figuring out “how much can I afford on a house?”
Start with your monthly income
The starting point for any affordability calculation is your gross monthly income. If you are salaried, take your yearly pay and divide it by 12. If your income fluctuates due to freelance work or commissions, average your tax returns from the last two years for a more consistent number. Lenders look at this number to determine how much you can afford to borrow, so it matters.
Apply the 20/30/40 rule
This system regulates the cost of housing compared to the rest of your budget.
- 20 percent down payment: A 20% down payment will save you from private mortgage insurance, which is usually an extra 0.5% to 1% of the loan balance per year. On a $350,000 loan, that could be an additional $1,750 to $3,500 a year.
- 30 percent mortgage payment: Keep your monthly mortgage payment (principal, interest, taxes and insurance) to 30% of your gross monthly income.
- 40 percent total debt: Gross income should cover all monthly debt obligations combined, including car loans, student loans, credit cards and the new mortgage, and should be less than 40 percent of gross income.
For a household earning $8,000 per month, a mortgage payment of about $2,400 and total debt load not exceeding $3,200 is recommended.
Check your debt-to-income ratio
Lenders will look closely at your debt-to-income ratio when deciding how much to approve you for. Most traditional lenders prefer a debt-to-income ratio below 36 percent, though some will go up to 43 percent for very well-qualified borrowers. To find yours, add all your fixed monthly payments and divide by your gross monthly income. If it’s over 40 percent, you may want to pay down existing debt before applying.
Factor in hidden costs
The mortgage payment is not the only part of the monthly picture. Consumers should plan for all closing costs and ongoing expenses before agreeing to a purchase price, the Consumer Financial Protection Bureau says. Some of the more common expenses that tend to catch first-time buyers by surprise are:
- Property taxes: These can vary greatly by state and county, but often add $200 to $600 per month.
- Homeowners insurance: $100 to $300 per month, depending on location and coverage.
- Maintenance: As a rule of thumb, budget 1 percent of the value of the home per year, or about $365 a month on a $439,000 home.
- HOA fees: If the property is part of a homeowners association, monthly dues can range from $50 to $500 or more.
Those costs can add another $700 to $1,500 to the base mortgage payment, which is why a home that seems affordable on paper can feel tight in practice.
Understand how interest rates affect your budget
A little difference in the rate means a lot in 30 years. A $350,000 loan at 6.37 percent will cost about $2,185 a month. If you can get that rate down to 5.75 percent, your payment drops to roughly $2,042 – a savings of $143 per month, or more than $51,000 over the life of the loan.
Your credit score is directly at stake. Borrowers with scores over 750 usually get the best rates, while scores below 680 can lead to rates that are a full percentage point higher.
Conclusion
Calculating your home budget is just about doing the honest math. Understand how much you earn, figure out what you owe, save for a healthy down payment and factor in the costs that are not part of the mortgage itself. The market in 2026 favors those who prepare. Those buyers who start the process with a solid budget spend less time chasing houses they can’t afford and more time closing on houses they can.