Your monthly payment on a $300,000 mortgage ranges from roughly $1,430 to $2,000, 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. On a $300,000 loan at 7% interest over 30 years, you pay about $1,996 per month in principal and interest alone. At 6%, that same loan costs $1,799 monthly. At 5%, it drops to $1,610. A 15-year loan at 7% costs $2,797 per month—higher because you're paying it off twice as fast.

But your actual payment to the lender is usually higher than the principal-and-interest number. Most mortgage payments also include property taxes, homeowners insurance, and possibly mortgage insurance (PMI). These additions vary wildly by location and your down payment size. In a high-tax state, these extras can add $400 to $800 per month. In a low-tax area, they might add $200 to $400.

Key Takeaways

  • A $300,000 mortgage at 7% interest over 30 years costs $1,996 monthly in principal and interest; at 6% it costs $1,799; at 5% it costs $1,610.
  • Your actual payment to the lender includes property taxes, homeowners insurance, and possibly PMI, which can add $200 to $800 per month depending on your location and down payment.
  • A 15-year loan costs roughly 40% more per month than a 30-year loan on the same amount, because you pay it off in half the time.
  • You can use an online mortgage calculator with your specific rate, term, and location to see your exact monthly cost before you commit.

How interest rate changes affect your monthly payment

Every 1% change in interest rate shifts your monthly payment by roughly $200 on a $300,000 loan. The difference between 6% and 7% is about $197 per month over 30 years. Between 5% and 6%, it's about $189. These gaps compound over the life of the loan—a 1% difference costs you roughly $71,000 more over 30 years.

Your interest rate depends on your credit score, down payment size, loan type (conventional, FHA, VA, USDA), and the current market. Rates change daily. If you're shopping for a mortgage, getting pre-approved by multiple lenders lets you compare actual rates they'll offer you, not just national averages.

The difference between 15-year and 30-year loans

A 30-year mortgage spreads payments over twice as long, so each monthly payment is smaller. A 15-year mortgage compresses the same debt into half the time, so payments are higher but you pay far less interest overall. On a $300,000 loan at 7%, the 30-year payment is $1,996 monthly; the 15-year payment is $2,797 monthly—$801 more per month. But over the life of the loan, you pay roughly $218,000 in interest on the 30-year versus $103,000 on the 15-year. That's a $115,000 difference.

The 15-year loan makes sense if you can afford the higher payment and want to own your home free and clear faster. The 30-year loan makes sense if you want lower monthly payments and prefer to invest the difference elsewhere. Neither is objectively right—it depends on your cash flow and goals.

What gets added to your principal-and-interest payment

Lenders bundle several costs into your monthly mortgage payment, often called PITI (principal, interest, taxes, insurance). Property taxes vary by county and state—some areas tax homes at 0.3% of value annually, others at 1.5% or higher. On a $300,000 home, that's anywhere from $75 to $375 per month just in taxes. Homeowners insurance typically runs $100 to $300 monthly depending on the home's age, location, and coverage level.

If you put down less than 20%, your lender requires private mortgage insurance (PMI), which protects them if you default. PMI on a $300,000 loan usually costs 0.5% to 1.5% of the loan amount annually—roughly $125 to $375 per month. PMI drops off automatically once you reach 20% equity, or you can request removal once you hit that threshold. Some lenders let you remove it sooner if your home value rises or you make extra payments.

How your down payment size affects the total monthly cost

A larger down payment lowers your loan amount, which lowers your monthly payment and eliminates PMI. If you put 20% down on a $300,000 home ($60,000), you borrow $240,000. At 7% over 30 years, that's $1,597 monthly in principal and interest—$399 less than if you borrowed the full $300,000. You also skip PMI entirely, saving another $125 to $375 monthly.

If you put 10% down ($30,000), you borrow $270,000 and pay PMI on top of a higher principal-and-interest payment. The math often favors saving for a larger down payment if you can, because PMI is pure cost with no equity-building benefit. However, if waiting for a 20% down payment means renting for years longer, a smaller down payment with PMI might still be the better move for your situation.

Using a mortgage calculator to find your exact payment

Online calculators let you plug in your loan amount, interest rate, loan term, and location to see your estimated monthly payment. Bankrate, NerdWallet, and most lender websites offer free calculators. Enter $300,000, your expected interest rate, 30 years (or 15), and your state to see principal, interest, taxes, and insurance broken out separately.

Keep in mind that calculators use average tax rates and insurance costs for your area—your actual payment may differ. Property taxes and insurance are the biggest variables. Once you have a pre-approval from a lender, they'll give you a Loan Estimate that shows your exact projected payment, including all taxes and insurance based on the specific property you're buying.

What happens if rates drop after you lock in

Once you lock an interest rate with a lender, that rate is may provide for a set period—usually 30 to 60 days. If rates drop during that window, you're stuck with your locked rate. If rates rise, you're protected. Some lenders offer a "float-down" option that lets you lock in a lower rate if the market drops before closing, but this usually costs a fee upfront.

If rates drop significantly after you close, you can refinance—taking out a new loan at the lower rate to pay off the old one. Refinancing has closing costs (typically 2% to 5% of the loan amount), so it only makes sense if the rate drop is large enough to recoup those costs over time. A 1% rate drop might justify refinancing; a 0.25% drop probably won't.

Frequently Asked Questions

Can I pay off a $300,000 mortgage faster without refinancing?

Yes. You can make extra payments toward principal whenever you have the cash. Even an extra $100 or $200 per month shortens the loan term and saves interest. Some lenders let you make bi-weekly payments instead of monthly, which results in one extra payment per year. Check your loan documents for prepayment penalties—most mortgages have none, but some older loans do.

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

A fixed-rate mortgage locks your interest rate for the entire loan term—30 years, 15 years, whatever you choose. Your payment never changes. An adjustable-rate mortgage (ARM) starts with a lower rate for a set period (often 3, 5, 7, or 10 years), then adjusts annually based on market rates. ARMs are riskier because your payment can jump hundreds of dollars when the rate adjusts. Fixed-rate mortgages are more predictable.

Does my credit score affect the interest rate I'm offered?

Yes. Borrowers with credit scores above 740 typically get the lowest rates. Scores between 620 and 739 face higher rates, sometimes 0.5% to 1% higher. Scores below 620 may not may have access to for conventional mortgages at all. Even a 20-point difference in credit score can mean $50 to $100 more per month on a $300,000 loan. Paying down debt and fixing errors on your credit report before applying can lower your rate.

What if I want to know my payment before I'm pre-approved?

Use an online calculator with current average rates in your area—you can find these on Bankrate, the Mortgage Bankers Association, or the Federal Reserve's website. Rates vary by lender and your credit profile, so a calculator gives you a ballpark figure, not your exact rate. Once you're pre-approved, your lender will quote your actual rate based on your credit, down payment, and the specific property.

Is property tax included in my mortgage payment?

Only if your lender requires an escrow account, which most do. Your lender collects one-twelfth of your annual property tax bill each month as part of your mortgage payment, then pays the tax bill when it's due. This protects the lender—they know the property taxes are paid and the home won't be seized for non-payment. You can ask your lender whether escrow is required or optional.