The monthly payment on a $400,000 mortgage ranges from roughly $1,900 to $3,100, depending on your interest rate and loan term

The payment you make each month covers principal (the amount you borrowed), interest (what the lender charges), property taxes, homeowners insurance, and possibly mortgage insurance. The interest rate and how many years you take to repay the loan are the two biggest factors that move your payment up or down.

A 30-year mortgage at 6.5% interest costs about $2,530 per month in principal and interest alone. The same loan at 7.5% costs about $2,800. A 15-year mortgage at 6.5% costs roughly $3,290 per month. These numbers assume you put down 20% ($80,000) and financed $320,000. If you put down less, your payment rises because you borrowed more and because you'll pay mortgage insurance.

Property taxes and insurance are separate from these numbers and vary by location. In a high-tax state like New Jersey or Illinois, they can add $400 to $600 per month. In a lower-tax state, they might add $200 to $300. Your lender will roll all of this into one payment you make each month.

Key Takeaways

  • A $400,000 mortgage at 6.5% over 30 years costs about $2,530 monthly in principal and interest, before taxes and insurance.
  • Every 1% change in interest rate shifts your monthly payment by roughly $250 to $300 on a 30-year loan.
  • Putting down less than 20% adds mortgage insurance (PMI) to your payment, typically 0.5% to 1% of the loan amount per year.
  • Property taxes and homeowners insurance are added to your principal and interest payment, and the total varies widely by state and county.
  • A 15-year mortgage costs more per month but you pay far less interest over the life of the loan.

How interest rate changes affect your payment

The interest rate is the single most powerful lever on your monthly payment. A difference of 0.5% can mean $125 to $150 more or less each month on a $400,000 loan over 30 years. A full percentage point difference means roughly $250 to $300 per month.

If you're shopping for a mortgage, this is why locking in a rate matters. Rates move daily. A rate of 6% versus 7% on a $320,000 loan (after a 20% down payment) means the difference between $1,918 and $2,133 per month—$215 more every single month for 30 years, which adds up to $77,400 in extra payments.

Some lenders offer the option to buy down your rate by paying points upfront—each point costs 1% of the loan amount and typically lowers your rate by 0.25%. On a $320,000 loan, one point costs $3,200 and might lower your rate from 7% to 6.75%. Whether that trade-off makes sense depends on how long you plan to stay in the house.

What happens when you put down less than 20%

If you put down 15% instead of 20%, you finance $340,000 instead of $320,000. Your payment rises not just because the loan is larger, but because you'll pay private mortgage insurance (PMI)—a monthly fee that protects the lender if you default.

PMI typically costs between 0.5% and 1% of the loan amount per year, paid monthly. On a $340,000 loan, that's roughly $140 to $280 per month. You'll pay PMI until you reach 20% equity in the home, which takes years. Once you hit that threshold, you can request to have it removed.

A 10% down payment ($40,000) means financing $360,000. Your PMI cost rises, and your total monthly payment—principal, interest, and insurance—could easily exceed $2,800 before property taxes and homeowners insurance are added.

The difference between 15-year and 30-year loans

A 15-year mortgage forces you to pay off the loan twice as fast, so your monthly payment is much higher but you pay far less interest overall. On a $320,000 loan at 6.5%, a 15-year mortgage costs about $3,290 per month, compared to $2,530 for a 30-year mortgage.

Over the full term, the 30-year loan costs you roughly $551,000 in total payments (principal plus interest). The 15-year loan costs about $591,000 in total payments. That sounds like more, but you've paid off the house 15 years earlier and owe nothing for the second half of that time. The interest you avoid by paying faster is substantial.

The trade-off is monthly cash flow. If you choose the 15-year option, that extra $760 per month has to come from your budget. Many people choose the 30-year mortgage for flexibility and pick a higher payment only if their income allows it.

Property taxes and insurance add significantly to your payment

Your lender requires you to carry homeowners insurance and pay property taxes. These are rolled into your monthly mortgage payment through an escrow account—the lender collects a portion each month and pays the bills on your behalf when they're due.

Property taxes vary wildly by location. In Texas, they average around 0.8% of home value per year. In New Jersey, they average around 2.5%. On a $500,000 home (the purchase price if you financed $400,000 with a 20% down payment), Texas property taxes might be $4,000 per year ($333 per month), while New Jersey taxes could be $12,500 per year ($1,042 per month).

Homeowners insurance typically costs $1,000 to $2,000 per year depending on the home's age, location, and coverage level. That's roughly $85 to $165 per month. In areas prone to hurricanes or wildfires, insurance can cost significantly more.

Your total monthly payment—principal, interest, taxes, and insurance—is often called your PITI payment. On a $400,000 mortgage in a moderate-tax state, PITI might range from $2,400 to $3,200 per month depending on all these factors combined.

How to estimate your exact payment

To calculate your payment, you need four pieces of information: the loan amount (purchase price minus down payment), the interest rate, the loan term in years, and your property tax rate and insurance estimate for your area.

Most lenders provide a mortgage calculator on their website where you enter these numbers and see the principal and interest portion when ready. To get the full PITI number, add your estimated monthly property taxes and insurance.

Property tax estimates come from your county assessor's office or a real estate agent in the area. Insurance quotes come from homeowners insurance companies—you can get several quotes in minutes online. Once you have all the pieces, you can see what your actual monthly payment will be before you commit to a loan.

What lenders look for when you explore

Lenders use your monthly payment to calculate your debt-to-income ratio (DTI)—the percentage of your gross monthly income that goes to debt payments. Most lenders want your DTI to be 43% or lower, though some go up to 50% for borrowers with strong credit and savings.

If you earn $6,000 per month gross, a 43% DTI means your total debt payments (mortgage, car loans, credit cards, student loans) can't exceed $2,580. If your mortgage payment alone is $2,800, you won't may have access to unless you have very little other debt.

This is why down payment size matters beyond just the PMI cost. A larger down payment means a smaller loan, a smaller monthly payment, and an easier time meeting the lender's DTI requirement. On a $400,000 purchase, putting down 25% instead of 20% lowers your loan from $320,000 to $300,000 and reduces your monthly payment by roughly $200.

Frequently Asked Questions

Does my payment change if interest rates drop after I lock in my rate?

No. Once you lock in a rate with your lender, your payment is fixed for the life of the loan (assuming a fixed-rate mortgage). If rates drop, you can refinance—take out a new loan at the lower rate—but that involves closing costs and a new process. Refinancing makes sense only if the rate drop is large enough to offset those costs.

What's the difference between a fixed-rate and adjustable-rate mortgage?

A fixed-rate mortgage keeps the same interest rate and payment for the entire loan term. An adjustable-rate mortgage (ARM) has a lower rate for an initial period (often 3, 5, 7, or 10 years), then adjusts annually based on market rates. ARMs start cheaper but can become much more expensive when rates rise. Most borrowers choose fixed-rate mortgages for predictability.

Can I pay extra toward principal to pay off the loan faster?

Yes. Most mortgages allow you to pay extra without penalty. Any amount above your required monthly payment goes directly to principal, reducing the total interest you'll pay and shortening the loan term. Even an extra $100 per month adds up significantly over 30 years.

What if I can't afford the payment I calculated?

You have several options: put down a larger down payment to borrow less, look for a less expensive home, extend the loan term to 40 years (if available) to lower the monthly payment, or improve your income or reduce other debt so you meet the lender's DTI requirement. Some lenders also offer first-time buyer programs with lower down payment requirements.

How much should I budget for property taxes and insurance?

Contact your county assessor's office for the property tax rate in your area, then multiply it by the home's estimated value. For insurance, get quotes from at least three homeowners insurance companies. Add both to your principal and interest payment to see your full monthly cost. These estimates can change—taxes may increase and insurance rates adjust annually.