Your monthly payment on a $600,000 mortgage ranges from roughly $3,600 to $5,400, depending on your interest rate and loan term
The exact number depends on three things: how much you borrowed, what interest rate you locked in, and whether you chose a 15-year or 30-year loan. A $600,000 mortgage at 7% interest over 30 years costs about $3,996 per month in principal and interest alone. At 6%, that same loan drops to $3,583. At 8%, it climbs to $4,440. Over 15 years at 7%, you'd pay roughly $5,592 monthly—higher each month, but you own the house faster and pay far less interest overall.
These numbers are the mortgage payment itself—what goes to the lender. Your actual monthly housing cost is higher. You also owe property taxes, homeowners insurance, and possibly mortgage insurance (PMI), depending on your down payment. If you put down less than 20%, PMI gets added to your bill. In some states and counties, property taxes alone can add $500 to $1,500 per month to that base payment.
Key Takeaways
- A $600,000 mortgage at 7% interest over 30 years costs approximately $3,996 per month in principal and interest.
- Interest rates matter enormously—a 1% difference changes your monthly payment by roughly $400 to $500.
- Your total monthly housing cost includes property taxes, homeowners insurance, and possibly mortgage insurance on top of the base payment.
- Choosing a 15-year loan instead of 30 years nearly doubles your monthly payment but cuts your total interest paid by more than half.
How interest rate changes affect your monthly payment
Interest rates move constantly, and even a small shift changes what you pay each month. The table below shows what a $600,000 mortgage costs at different rates, assuming a 30-year term:
| Interest Rate | Monthly Payment (Principal & Interest) | Total Interest Paid Over 30 Years |
|---|---|---|
| 5.5% | $3,410 | $627,600 |
| 6.0% | $3,583 | $689,880 |
| 6.5% | $3,760 | $753,600 |
| 7.0% | $3,996 | $839,040 |
| 7.5% | $4,198 | $911,280 |
| 8.0% | $4,440 | $997,200 |
Notice that the total interest you pay over the life of the loan grows faster than the monthly payment does. At 5.5%, you pay $627,600 in interest. At 8%, you pay $997,200—nearly $370,000 more. This is why even a quarter-point difference in your rate matters when you're borrowing this much.
15-year versus 30-year loans: the monthly cost trade-off
A 15-year mortgage lets you pay off the house in half the time, but your monthly payment is substantially higher. On a $600,000 loan at 7% interest, a 15-year term costs about $5,592 per month, compared to $3,996 for 30 years. That's $1,596 more each month.
The payoff is that you pay far less interest overall. Over 15 years at 7%, you pay roughly $407,040 in total interest. Over 30 years at the same rate, you pay $839,040. By choosing the shorter term, you save about $432,000 in interest—but only if you can afford the higher monthly payment without straining your budget.
Most people choose the 30-year loan because it keeps the monthly payment manageable and leaves room in the budget for other goals: saving for retirement, paying down other debt, or building an emergency fund. If you can comfortably afford the 15-year payment, it's a powerful wealth-building move. If it would force you to cut other savings or carry credit card debt, the 30-year loan is usually the smarter choice.
What's not included in that base payment
The numbers above cover only principal and interest. Your actual monthly housing bill includes several other costs. Property taxes vary wildly by location—from under $100 per month in some rural areas to $1,500 or more in high-tax states like New Jersey or Illinois. You'll pay these through an escrow account that your lender manages, so they're rolled into your monthly bill.
Homeowners insurance typically runs $100 to $300 per month for a $600,000 home, depending on the home's age, location, and your coverage level. This also goes into escrow. Mortgage insurance (PMI) is required if you put down less than 20%. On a $600,000 purchase, that means putting down less than $120,000. PMI typically costs 0.5% to 1% of the loan amount annually, or $250 to $500 per month—though it drops off once you've paid down the principal to 80% of the original home value.
If you're in a homeowners association, add HOA fees on top. These range from $50 to $500+ per month depending on what's included. Your total monthly housing cost could easily be $500 to $1,500 higher than the base mortgage payment alone.
How much income you need to afford this mortgage
Lenders typically want your total monthly debt payments—including the mortgage, car loans, credit cards, and student loans—to stay below 43% of your gross monthly income. Some lenders go up to 50% if you have excellent credit and savings.
If your mortgage payment is $3,996 and you have no other debt, you'd need a gross monthly income of roughly $9,300 to stay comfortably within the 43% threshold. That's about $111,600 per year. If you have other debts—a car payment, student loans, credit cards—you'd need higher income to may have access to.
This is a guideline, not a rule. Some lenders are stricter, some more flexible. The point is that a $600,000 mortgage is not a loan for someone making $50,000 a year. It requires solid income and ideally some cash reserves to cover property taxes, insurance, and unexpected repairs.
How to estimate your actual monthly payment
To calculate your own number, you need three pieces of information: the loan amount (in this case, $600,000 minus your down payment), your interest rate, and your loan term in years. Plug those into any mortgage calculator—Bankrate, NerdWallet, and the Consumer Financial Protection Bureau all have free ones—and you'll get your principal-and-interest payment in seconds.
Then add your property taxes (divide your annual tax bill by 12), homeowners insurance (call an agent for a quote), and PMI if applicable. That's your true monthly housing cost. Compare it to your monthly income using the 43% rule to see if it fits your budget.
If the payment is too high, you have three levers: borrow less (put down more money), lock in a lower interest rate (shop multiple lenders), or extend the loan term (though this costs more interest overall). Most people adjust the down payment or the rate first, because those have the biggest impact on affordability.
Frequently Asked Questions
Does the monthly payment change if interest rates drop after I lock in my rate?
No. Once you close on the mortgage, your interest rate and monthly payment are fixed for the life of the loan (assuming a fixed-rate mortgage). If rates drop later, you could refinance to a new loan at the lower rate, but that involves closing costs and a new application process.
What happens if I pay extra toward principal each month?
Extra payments go directly to principal, which shortens your loan term and reduces the total interest you pay. Paying an extra $200 per month on a 30-year mortgage can cut years off the loan and save tens of thousands in interest. Just make sure your lender doesn't charge a prepayment penalty—most don't, but it's worth confirming.
Can I get a mortgage for $600,000 with a lower down payment?
Yes, but you'll pay mortgage insurance. Conventional loans typically require 3% to 20% down. FHA loans allow as little as 3.5% down, though they have their own insurance costs and limits on loan amounts. The lower your down payment, the higher your monthly payment because of PMI.
How much does refinancing cost, and is it worth it?
Refinancing typically costs $2,000 to $5,000 in closing costs. It's worth considering if rates have dropped by at least 0.5% to 1% since you closed, or if you want to switch from a 30-year to a 15-year loan. Use a refinance calculator to compare your current payment against the new payment minus closing costs spread over the remaining loan term.
What if I want to pay off the mortgage faster without refinancing?
Make extra principal payments whenever you can. Even $100 or $200 extra per month adds up over time. Some people make bi-weekly payments instead of monthly, which results in one extra payment per year. Others round up their payment to the nearest $500. All of these strategies shorten the loan and save interest without requiring a formal refinance.