The real limit is what your lender will approve, not what feels comfortable
Most lenders will approve you for a mortgage payment up to 28% of your gross monthly income — that is your income before taxes. Some will go as high as 43% if you have strong credit and low other debts. But the amount a lender approves you for and the amount you can actually pay every month without strain are two different numbers. A lender looks at your debt-to-income ratio on paper; you have to live with the payment in real life.
Start by knowing your gross monthly income — the number on your pay stub before deductions. Multiply that by 0.28. That is the maximum your lender is likely to approve for your total monthly housing payment, which includes the mortgage principal and interest, property taxes, homeowners insurance, and mortgage insurance if you put down less than 20%. If you have other debts — car loans, student loans, credit cards — lenders will also factor those in and may lower the housing payment they approve.
Key Takeaways
- Lenders typically approve a mortgage payment up to 28% of your gross monthly income, but this is a ceiling, not a recommendation for what you should spend.
- Your actual affordable payment depends on your other debts, your local property taxes and insurance costs, and how much you want left over each month for emergencies and savings.
- A down payment of 20% or more eliminates mortgage insurance and lowers your monthly payment significantly compared to putting down 10% or 5%.
- Property taxes and homeowners insurance vary by location and can add hundreds of dollars per month to your payment, so get a quote for your specific area before deciding what you can afford.
What gets included in your monthly housing payment
Your mortgage payment is not just principal and interest. When you get a loan estimate from a lender, the payment includes four things: principal and interest (the amount you borrowed plus the cost of borrowing), property taxes, homeowners insurance, and mortgage insurance if your down payment was less than 20%. Some lenders call this PITI plus PMI.
Property taxes and homeowners insurance are the wild cards because they vary dramatically by location. A house in one county might have property taxes of $200 a month while an identical house across the state line costs $400 a month. Homeowners insurance ranges from about $80 to $200 a month depending on the house, your location, and your claims history. Before you decide what house price you can afford, get a quote for property taxes and insurance in the specific area where you are looking. Your real estate agent or a local insurance agent can give you these numbers quickly.
Mortgage insurance (PMI) applies only if you put down less than 20%. On a $300,000 loan with 10% down, PMI might run $150 to $200 a month. It disappears once you have paid down the loan to 80% of the original home value, but that can take years. This is why a larger down payment directly lowers your monthly payment.
The difference between what you can afford and what you should spend
A lender approving you for a $400,000 mortgage does not mean you should take it. Lenders are in the business of lending; they have incentive to approve the largest loan possible. Your incentive is different: you need money left over each month for emergencies, retirement savings, and life.
A practical rule is to keep your total housing payment — mortgage, taxes, insurance, and PMI — to no more than 25% of your gross income. This leaves more cushion than the 28% lenders use. If your gross income is $5,000 a month, that means a housing payment of $1,250 or less. This is tighter than what a lender might approve, but it leaves room for a car payment, student loans, groceries, utilities, and unexpected costs.
Also consider your down payment. The more you put down, the lower your monthly payment. Putting down 20% instead of 10% lowers your payment by roughly 10% because you are borrowing less and eliminating PMI. If you have the cash, a larger down payment is usually the fastest way to lower your monthly obligation.
How to calculate your affordable payment step by step
Start with your gross monthly income. If you are self-employed or your income varies, use an average of the last two years or the most conservative recent month.
Multiply your gross income by 0.25 (the practical ceiling). This is the maximum housing payment you should aim for. If your gross income is $6,000 a month, your target housing payment is $1,500.
Now work backward. Subtract your other monthly debts — car loans, student loans, credit card minimums, personal loans — from that number. If you have $300 in car payments and $200 in student loans, your available housing payment is $1,000. This is what you have left for mortgage, taxes, insurance, and PMI combined.
Use a mortgage calculator to see what loan amount that payment supports. You will need to input your down payment amount, your interest rate (ask your lender for a current rate), your loan term (usually 30 years), and estimates for property taxes and insurance in your area. The calculator will show you the maximum home price you can afford.
Why your credit score and debt matter
Lenders use your debt-to-income ratio to decide how much to lend you. This ratio includes all your monthly debts divided by your gross income. If you earn $6,000 a month and have $1,500 in debts (car, student loans, credit cards), your debt-to-income ratio is 25%. Lenders typically want this ratio to stay below 43% when you add a mortgage payment.
This means paying down other debts before you apply for a mortgage can increase the housing payment you are approved for. If you pay off a $300 car loan, your debt-to-income ratio drops, and you may be approved for a larger mortgage payment. Similarly, your credit score affects your interest rate. A score of 740 or higher typically gets you the best rates; a score below 620 may mean higher rates or rejection.
If you are not ready to buy yet, paying down debts and building your credit score will lower your interest rate and increase your approved payment amount when you do apply.
The cost of stretching too far
Buying the maximum house a lender approves you for often leads to financial stress. Your payment is high, property taxes and insurance can increase, and you have little left for maintenance, repairs, or emergencies. A roof replacement, a major plumbing repair, or a job loss becomes a crisis instead of an inconvenience.
Homes also have hidden costs. Homeowners insurance, property taxes, and HOA fees (if applicable) all increase over time. A payment that feels manageable at 28% of your income may feel tight at 30% or 32% after a few years of increases. Buying a house at 25% of your income gives you room to absorb these increases without hardship.
Frequently Asked Questions
What if my income is irregular or I am self-employed?
Lenders typically average your income over the last two years for self-employed borrowers, or they use your most recent tax return. Some lenders require two years of tax returns. If your income has grown significantly, bring documentation of the growth — a business license, recent contracts, or a letter from your accountant — to show the lender your current earning power.
Does my down payment size affect how much I can borrow?
Yes. A larger down payment lowers your monthly payment because you are borrowing less and eliminating mortgage insurance. It also improves your debt-to-income ratio, which may allow you to borrow more overall. Putting down 20% instead of 5% can lower your monthly payment by 15% to 20%.
Should I use an online calculator or talk to a lender first?
Use a calculator to get a rough idea, then talk to a lender. A calculator shows you what different loan amounts cost, but only a lender can tell you what you are actually approved for based on your credit, income, and debts. A pre-approval letter from a lender is also useful when you make an offer on a house.
What if property taxes in my area are very high?
High property taxes directly reduce the house price you can afford because they are part of your monthly payment. If property taxes are $400 a month instead of $150, your available mortgage payment drops by $250, which might mean you can afford a house $40,000 to $50,000 cheaper. Always get local tax and insurance quotes before deciding on a price range.
Can I afford a house if I have student loan debt?
Yes, but your student loan payments reduce the mortgage payment a lender will approve. If you have $300 a month in student loans and earn $6,000 gross, a lender may approve you for a housing payment of around $1,200 instead of $1,680. Paying down student loans before applying for a mortgage increases your approved amount.