Mortgage Payment on a $300K, $400K, and $500K House: What You'll Actually Pay

The real monthly payment on a home is almost always higher than the numbers you see on listing sites. Here's exactly what you'll pay at each price point — including taxes, insurance, and PMI — so you can budget accurately before you make an offer.

All examples below use current (2026) rate levels at 6.75–7.0% for 30-year fixed conventional loans. Adjust proportionally if rates have shifted since.

Mortgage Payment on a $300,000 House

Down payment scenarios:

Property tax estimate: $350/month assumes a 1.4% annual tax rate — typical for much of the Midwest and South. Tax rates in New Jersey (2.1%), Illinois (2.3%), or Texas (1.6%) push this higher. Florida, Colorado, and most Western states run 0.5–0.8%, pushing it lower.

Homeowners insurance: $130/month is conservative for most markets. Florida, Louisiana, and Gulf Coast states may run $200–$400/month due to wind and flood risks.

The income you need: At a 28% front-end ratio, you'd need approximately $9,200/month gross income ($110,400/year) to qualify for the 5% down scenario. At 20% down, approximately $7,300/month gross ($87,600/year).

Mortgage Payment on a $400,000 House

Note that the 20% down scenario on $400K requires $80,000 upfront — a meaningful hurdle for first-time buyers. The practical entry point for many buyers is 5–10% down, which pushes the monthly payment over $3,000 before utilities and maintenance.

The income you need: The 5% down scenario ($3,350/month) requires approximately $143,000 in annual gross income at the 28% front-end limit. At 20% down ($2,693), approximately $115,000/year.

These are gross figures. At $143,000 gross in a typical tax environment, take-home is approximately $95,000–$100,000/year. The $3,350/month housing cost represents 40–42% of take-home — above the comfortable range for most households.

Mortgage Payment on a $500,000 House

At 5% down on a $500,000 home, the combined payment exceeds $4,100/month. At 20% down, it's $3,347 — but only after deploying $100,000 upfront in down payment alone (before closing costs).

The 2026 conforming loan limit for single-family homes in most US markets is $806,500 (Federal Housing Finance Agency raises it annually). A $500K purchase price fits within conventional conforming limits in most markets. However, in high-cost areas (parts of California, New York, Hawaii), limits are higher and you remain in conforming territory.

The income you need: For 20% down on a $500K home, the 28% front-end rule requires approximately $143,000 gross annual income. For 5% down, approximately $179,000.

The True Monthly Cost: Adding What PITI Misses

The tables above show PITI + PMI. The full cost of homeownership adds:

Maintenance reserve (1–2% of home value annually):

• $300K home: $250–$500/month
• $400K home: $333–$667/month
• $500K home: $417–$833/month

Utility step-up (moving from apartment to house): Add $200–$400/month in most markets — more square footage, no shared walls, individual water/trash, lawn maintenance.

The honest total monthly outlay:

These are meaningful numbers. If you budget around the P&I figure — $1,773 for the $300K home at 10% down — and discover the real total is closer to $2,900, that $1,127 gap represents a serious cash flow problem.

How Rates Change the Payment

At different rate levels, here's the P&I on a $350,000 loan (splitting the difference between the $300K and $400K examples):

A 1% rate difference on a $350,000 loan costs $232/month more — $83,520 over 30 years. This is why the rate difference matters far beyond its appearance on paper.

For UK, Australian, and Canadian Buyers

These examples use US tax and insurance assumptions. The payment structure translates across markets, but the surrounding costs differ:

UK: Stamp duty, solicitor fees, and survey costs add significant upfront costs beyond the deposit. Monthly payments follow a similar formula. Buildings insurance (equivalent to US homeowners insurance) is required; contents insurance is separate.

Australia: At equivalent purchase prices in AUD, Lenders Mortgage Insurance (LMI) on loans above 80% LTV is substantially higher than US PMI — a one-time premium capitalized into the loan, not a monthly charge. At 90% LTV on a $500K AUD purchase, LMI can add $15,000–$25,000 to your loan balance.

Canada: The CMHC insurance premium for 5% down is 4.0% of the mortgage — on a $380,000 loan, that's $15,200 added to your balance. Monthly payments include this capitalized premium. The stress test further reduces qualifying loan amounts by 10–20%.

Finding Your Number

The tables here are starting points. Your actual payment depends on your specific rate (which varies by credit score, lender, and LTV), your actual county's property tax rate, your home's insurance profile, and your exact down payment.

The Mortgage Math & Affordability Calculator Toolkit includes a full PITI worksheet where you input your specific numbers — not national averages — to get a payment estimate that matches your actual situation. It also includes a reverse calculation: enter your maximum comfortable monthly payment, and it tells you what purchase price you can realistically afford at current rates.