What a $300,000 house actually costs you each month

A $300,000 house does not cost $300,000 a year to own. But the monthly payment is only part of what you pay. On a 30-year mortgage at current interest rates (which vary by lender and your credit score), a $300,000 loan costs roughly $1,400 to $1,600 per month in principal and interest alone. Add property taxes, homeowners insurance, and mortgage insurance if you put down less than 20 percent, and your total housing payment climbs to $2,000 to $2,500 or more, depending on where you live.

The standard rule is that your housing payment should not exceed 28 percent of your gross monthly income. That means to comfortably carry a $300,000 house, you need a gross monthly income of around $7,100 to $9,000—or roughly $85,000 to $108,000 per year. This is a starting point, not a may provide. Your actual affordability depends on your down payment, your interest rate, your local property taxes, and what other debts you already carry.

Key Takeaways

  • A $300,000 house typically costs $2,000 to $2,500 per month in housing payments when you factor in taxes, insurance, and mortgage insurance.
  • Lenders use the 28 percent rule: your housing payment should not exceed 28 percent of your gross monthly income, which means you need roughly $85,000 to $108,000 annual income.
  • Your down payment size directly affects your monthly cost—putting down 20 percent saves you mortgage insurance, while 10 percent or less adds $200 to $400 monthly.
  • Your debt-to-income ratio matters as much as your housing payment alone; lenders look at all your debts together, not just the mortgage.
  • Interest rates change daily and vary by credit score, so getting pre-approved by an actual lender tells you far more than any calculator.

How your down payment changes what you can afford

The amount you put down upfront directly shrinks or grows your monthly payment. If you put down 20 percent ($60,000), you borrow $240,000 and avoid private mortgage insurance (PMI). If you put down 10 percent ($30,000), you borrow $270,000 and pay PMI—typically $200 to $400 per month depending on your credit score and the loan amount. That PMI stays on your loan until you reach 20 percent equity, which takes years.

The difference between a 10 percent and 20 percent down payment on a $300,000 house is roughly $200 to $400 monthly, plus the cost of borrowing an extra $30,000. Over five years, that adds up to $12,000 to $24,000 in extra payments. If you have $30,000 saved but not $60,000, you can still buy—but you need to know that cost is real and will stay on your loan until you refinance or reach that equity threshold.

What your credit score and debt do to your interest rate

Interest rates are not the same for everyone. A borrower with a 750 credit score might get a rate of 6.5 percent, while a borrower with a 650 score might pay 7.5 percent on the same loan. That one percentage point difference costs roughly $100 more per month on a $240,000 loan. Over 30 years, it adds up to $36,000.

Lenders also look at your debt-to-income ratio (DTI), which is all your monthly debt payments divided by your gross monthly income. Most lenders want your DTI below 43 percent. If you earn $7,000 per month and already pay $1,500 in car loans, student loans, and credit cards, you have $1,500 in existing debt. A $2,000 mortgage payment would push your DTI to 50 percent, and most lenders will deny you. You would need to pay down other debts first or earn more income.

The real costs beyond the mortgage payment

Property taxes vary wildly by location. In some states, property tax on a $300,000 house runs $200 to $300 per month. In others, it runs $500 to $700. Homeowners insurance typically costs $100 to $200 per month, though it varies by the age of the house, your location, and the insurer. If you put down less than 20 percent, add PMI. If you live in a flood zone or high-risk area, add flood insurance.

Many buyers forget about maintenance and repairs. A general rule is to budget 1 percent of the home's purchase price annually for upkeep—that is $3,000 per year, or $250 per month, for a $300,000 house. A new roof, a failed water heater, or foundation work can cost $5,000 to $15,000 in a single year. If you do not have an emergency fund separate from your down payment savings, a major repair can force you into high-interest debt.

How to calculate your actual affordability

Start with your gross monthly income. Multiply it by 0.28 to find the maximum housing payment lenders typically allow. That number includes principal, interest, taxes, insurance, and PMI if applicable. Subtract your property tax estimate and insurance estimate to see how much is left for the actual mortgage payment.

Next, list all your other monthly debts: car payments, student loans, credit cards, personal loans. Add your target housing payment to that total, then divide by your gross monthly income. If the result is 43 percent or less, you are in the range most lenders will consider. If it is higher, you either need to pay down other debts, increase your income, or look at a lower-priced house.

The most accurate step is to contact a mortgage lender directly and ask for a pre-approval. They will pull your credit, verify your income, and tell you the exact loan amount, interest rate, and monthly payment you may have access to for. Online calculators are useful for rough estimates, but a pre-approval from a real lender is the only number that matters when you start house hunting.

When a $300,000 house is out of reach—and what to do

If the math does not work, you have three levers to pull. First, increase your down payment if you can save more—even an extra $10,000 lowers your monthly payment and removes PMI sooner. Second, pay down other debts before you apply for a mortgage. Paying off a car loan or credit card balance can lower your DTI enough to may have access to for a larger loan. Third, look at a lower-priced house. A $250,000 house costs roughly $300 to $400 less per month than a $300,000 house, and that difference compounds over 30 years.

You can also wait. If you are six months or a year away from a raise, a bonus, or an inheritance, waiting lets you save more for a down payment or pay down debt. Homeownership is not a race. Buying a house you cannot comfortably afford leads to stress, missed payments, and sometimes foreclosure. It is better to wait and buy with confidence than to stretch and regret it.

Frequently Asked Questions

What income do I need to buy a $300,000 house?

Most lenders use the 28 percent rule: your housing payment should not exceed 28 percent of your gross monthly income. On a $300,000 house with taxes and insurance, that typically means you need a gross annual income of $85,000 to $108,000. Your exact number depends on your down payment, interest rate, local property taxes, and existing debts.

Can I buy a $300,000 house with a lower credit score?

Yes, but it costs more. A credit score below 700 usually means a higher interest rate, which raises your monthly payment by $100 to $300 or more. Some lenders require a credit score of at least 620 for a conventional loan. If your score is lower, you may need to wait and build credit, or look at a lower-priced house to stay within your budget.

What if I have student loans or other debts?

Lenders count all your debts when they calculate your debt-to-income ratio. If you already pay $1,500 per month in student loans and car payments, a $2,000 mortgage payment might push you over the 43 percent limit. You can either pay down those debts first, earn more income, or look at a lower-priced house.

Do I really need 20 percent down?

No. You can put down as little as 3 to 5 percent on some loans. But putting down less than 20 percent means you pay PMI, which adds $200 to $400 per month until you reach 20 percent equity. If you have the cash, 20 percent down saves you money over time. If you do not, a smaller down payment is still an option—just know the true cost.

Should I use an online calculator or talk to a lender?

Use both. Online calculators give you a rough idea in seconds. But a lender pre-approval tells you the real interest rate, the exact loan amount, and the actual monthly payment you may have access to for. Interest rates change daily and vary by credit score, so a pre-approval is the only number that matters when you start shopping.