The monthly payment on a $300,000 house ranges from roughly $1,430 to $2,150, depending on your interest rate, loan term, and down payment

The number that matters most is your interest rate. A borrower with a 6% rate on a 30-year loan pays around $1,799 per month (principal and interest only). The same house at 7% costs about $1,996. At 5%, it drops to $1,610. A quarter-point difference in rate can shift your payment by $50 to $100 monthly.

Your down payment also changes the calculation directly. If you put down 20% ($60,000), you borrow $240,000. If you put down 10% ($30,000), you borrow $270,000. A smaller down payment means a larger loan, which means a larger monthly bill. It also triggers mortgage insurance (PMI) if you borrow more than 80% of the home's value — that's an extra $150 to $300 per month depending on your loan size and credit score.

The loan term matters too. A 15-year mortgage costs more per month but less in total interest. A 30-year mortgage spreads payments over twice as long, so each payment is smaller but you pay far more interest overall. A $240,000 loan at 6% costs $1,439/month for 15 years or $1,439/month for 30 years — wait, let me recalculate: it's $1,799/month for 30 years but $1,844/month for 15 years. The 15-year payment is only slightly higher, but you pay off the house much faster.

Key Takeaways

  • The principal and interest payment alone ranges from $1,430 to $2,150 monthly depending on your rate, down payment, and loan length.
  • Interest rates have the single biggest impact on your monthly cost — a 1% difference can change your payment by $150 to $200.
  • Putting down less than 20% triggers mortgage insurance, which adds $150 to $300 monthly on top of your loan payment.
  • Your actual monthly bill also includes property taxes, homeowners insurance, and possibly HOA fees — these can equal or exceed your loan payment depending on your location.

How interest rates shift your payment

Interest rates are set by lenders and move with the broader economy. You do not choose the rate — you shop for it. A rate of 5.5% versus 6.5% on a $240,000 loan over 30 years is the difference between $1,361 and $1,520 monthly. Over the life of the loan, that $159 monthly difference adds up to $57,000 in extra interest.

Your credit score, down payment size, and loan type all affect what rate you are offered. Someone with a 750+ credit score and 20% down typically gets a better rate than someone with a 650 score and 5% down. Shopping with multiple lenders — mortgage banks, credit unions, online lenders — can uncover rate differences of 0.25% to 0.5%, which is worth hundreds of dollars over 30 years.

What happens when you put down less than 20%

If you borrow more than 80% of the home's purchase price, lenders require private mortgage insurance (PMI). On a $300,000 house with a 10% down payment, you borrow $270,000, which is 90% of the price. PMI typically costs 0.5% to 1.5% of the loan amount annually, paid monthly as part of your mortgage bill.

On a $270,000 loan, PMI might run $112 to $337 per month. You pay it until you reach 20% equity in the home — either by paying down the loan or by the home appreciating in value. Some loans let you request PMI removal once you hit 20% equity; others remove it automatically. Ask your lender about their PMI removal policy before you sign.

A smaller down payment gets you into the house faster, but it costs more monthly and takes longer to build equity. A larger down payment (15%, 20%, or more) lowers your monthly bill, eliminates PMI, and means you owe less. The trade-off is having less cash available for emergencies or other needs after closing.

The difference between 15-year and 30-year loans

A 15-year mortgage has a higher monthly payment but you own the house in half the time and pay far less interest overall. A 30-year mortgage has a lower monthly payment but stretches the debt across three decades.

On a $240,000 loan at 6%: a 15-year term costs about $1,844/month and you pay roughly $91,900 in total interest. A 30-year term costs about $1,439/month but you pay roughly $278,000 in total interest. The 30-year payment is $405 lower each month, but you pay an extra $186,000 in interest over the life of the loan.

A 15-year loan makes sense if you have stable income and want to pay off the house quickly. A 30-year loan makes sense if you want lower monthly payments or if you think you can invest the difference and earn more than your mortgage interest rate. Most borrowers choose 30 years because the payment fits their budget more comfortably.

Property taxes, insurance, and HOA fees add to your bill

Your actual monthly housing cost is not just principal and interest. You also pay property taxes, homeowners insurance, and possibly HOA (homeowners association) fees. Lenders often roll these into a single monthly payment called PITI (principal, interest, taxes, insurance).

Property taxes vary wildly by location. In some states or counties, they run 0.5% of home value annually; in others, they run 1.5% or higher. On a $300,000 house, that could be $1,500 to $4,500 per year, or $125 to $375 monthly. Homeowners insurance typically costs $800 to $1,500 annually, or $65 to $125 monthly, depending on the home's age, location, and coverage level. An HOA fee, if your property has one, might run $200 to $500 monthly.

These costs can easily match or exceed your loan payment. A borrower with a $1,439 principal-and-interest payment might have a total PITI payment of $2,200 to $2,500 when taxes and insurance are included. Ask your lender for a loan estimate that shows all these costs broken down.

How to estimate your own payment

You can calculate a rough estimate using the loan amount, interest rate, and term. Most mortgage calculators online let you enter these three numbers and see the principal-and-interest payment instantly. The formula is built into spreadsheet software too, if you want to avoid a website.

Start with your down payment. If you are putting 10% down on a $300,000 house, you borrow $270,000. Subtract any closing costs you plan to roll into the loan (some lenders allow this). Then plug that loan amount, your expected interest rate, and your preferred term (15, 20, or 30 years) into a calculator.

For property taxes and insurance, call your county assessor's office for the tax rate and ask a local insurance agent for a quote on homeowners insurance for that specific address. Add those estimates to your principal-and-interest number to get a full picture of your monthly housing cost.

Frequently Asked Questions

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

A fixed-rate mortgage locks in the same interest rate for the entire loan term — 15, 20, or 30 years. Your payment never changes. An adjustable-rate mortgage (ARM) has a lower rate for the first few years (often 3, 5, 7, or 10), then adjusts up or down annually based on market rates. Fixed-rate mortgages are more predictable; ARMs can save money upfront but carry the risk of higher payments later.

Can I pay off my mortgage early without a penalty?

Most mortgages allow you to pay extra toward principal at any time without penalty. Paying an extra $100 or $200 per month shortens your loan term and saves thousands in interest. Some older mortgages have prepayment penalties, so check your loan documents or ask your lender before you start making extra payments.

What does it mean if my loan is "underwater"?

You are underwater if you owe more on your mortgage than the home is worth. This can happen if the home's value drops after you buy it or if you put down a very small down payment. Being underwater does not mean you cannot sell or refinance, but it limits your options and you cannot walk away without losing money.

How much house can I afford on my income?

Most lenders use a debt-to-income ratio: your total monthly debt payments (including the new mortgage) should not exceed 43% to 50% of your gross monthly income. On a $5,000 monthly income, that means your housing payment plus other debts should stay under $2,150 to $2,500. Your lender will run this calculation during underwriting.

Should I get a larger down payment to avoid PMI?

Avoiding PMI saves $150 to $300 monthly, which adds up. But a larger down payment also means less cash in your pocket for emergencies, home repairs, or other investments. If you have stable savings and a solid emergency fund, a 20% down payment makes sense. If you are stretching to save, a smaller down payment with PMI might be the right choice.