Your monthly payment on a $300,000 mortgage ranges from roughly $1,430 to $2,150, depending on your interest rate and loan term
The exact number depends on three things: how much you borrow, your interest rate, and whether you choose a 15-year or 30-year loan. A $300,000 mortgage at 7% interest costs about $1,996 per month over 30 years, or $2,796 per month over 15 years. At 6%, those same loans run $1,799 and $2,687. At 5%, they drop to $1,610 and $2,533. The difference between a 6% rate and a 7% rate on a 30-year loan is roughly $200 per month—which is why your actual rate matters more than the headline number.
These figures cover only principal and interest. Your real monthly payment will be higher because it also includes property taxes, homeowners insurance, and possibly mortgage insurance (PMI), depending on your down payment. A lender will typically quote you a "total monthly payment" that bundles all of these together. The principal-and-interest portion is what changes with your rate and term; the taxes and insurance are specific to your property and location.
Key Takeaways
- A $300,000 mortgage at 6% interest costs about $1,799 per month over 30 years, or $2,687 over 15 years—principal and interest only.
- Your actual monthly payment will be 20 to 40 percent higher once property taxes, homeowners insurance, and possibly mortgage insurance are added in.
- A 1% difference in interest rate changes your monthly payment by roughly $200 on a 30-year loan, so shopping for rates across multiple lenders matters.
- The down payment you make affects whether you pay PMI, which can add $200 to $400 per month until you reach 20% equity in the home.
How interest rate and loan term change your payment
The relationship is straightforward: a lower rate means a lower payment, and a shorter term means a higher payment. The table below shows how these two factors interact on a $300,000 loan.
| Interest Rate | 30-Year Monthly Payment | 15-Year Monthly Payment |
|---|---|---|
| 5.0% | $1,610 | $2,533 |
| 5.5% | $1,703 | $2,608 |
| 6.0% | $1,799 | $2,687 |
| 6.5% | $1,897 | $2,768 |
| 7.0% | $1,996 | $2,851 |
| 7.5% | $2,098 | $2,936 |
Most borrowers choose 30-year loans because the monthly payment is manageable, even though you pay more interest over the life of the loan. A 15-year loan builds equity faster and costs less in total interest, but the monthly payment is roughly 50% higher. If you can afford the 15-year payment without stretching your budget, it saves you tens of thousands in interest. If you cannot, the 30-year loan is the realistic choice.
What gets added to your principal-and-interest payment
Lenders bundle several costs into your monthly mortgage bill. Property taxes vary widely by location—a $300,000 home in a high-tax county might carry $400 to $600 per month in taxes, while the same home in a low-tax area might be $150 to $250. Homeowners insurance typically runs $100 to $200 per month depending on the home's age, location, and coverage level. If your down payment is less than 20% of the purchase price, you will also pay mortgage insurance (PMI), which ranges from roughly $200 to $400 per month on a $300,000 loan.
A lender will give you an estimate of all these costs before you commit. Ask them to break out each line item so you understand what is fixed (principal and interest) and what varies by location and your specific situation (taxes, insurance, PMI). The total monthly payment—what you actually owe—is usually 25 to 40 percent higher than the principal-and-interest number alone.
How your down payment affects the total cost
The down payment you make determines two things: the loan amount and whether you pay PMI. If you put down 20% on a $300,000 home, you borrow $240,000 and avoid PMI entirely. If you put down 10%, you borrow $270,000 and pay PMI until you reach 20% equity. If you put down 5%, you borrow $285,000 and pay PMI for longer.
PMI is not permanent—it drops off once you own 20% of the home's value. On a $300,000 home with a 10% down payment, that takes roughly 6 to 8 years of on-time payments, assuming the home does not lose value. You can also request PMI removal once you hit 20% equity, though some lenders require you to wait until you reach it naturally. The cost of PMI is real money, but it is also temporary, which makes a smaller down payment sometimes worth considering if it means you can buy sooner.
Shopping for rates and locking in your offer
Interest rates change daily and vary between lenders. Getting quotes from at least three lenders—a bank, a credit union, and a mortgage broker—takes a few hours and can save you thousands over the life of the loan. A 0.5% difference in rate translates to roughly $100 per month on a 30-year $300,000 loan, or $36,000 over 30 years.
When you find a rate you want, you can lock it in for a set period—typically 30, 45, or 60 days. The lock protects you if rates rise while you are in underwriting or waiting for the appraisal. If rates fall, you may be able to renegotiate, though some lenders charge a fee for a rate reduction. Ask about the lock terms and any costs before you commit.
The difference between fixed and adjustable rates
A fixed-rate mortgage keeps the same interest rate for the entire loan term. Your payment never changes (except for property taxes and insurance, which can increase). This is the most common choice because it is predictable and protects you if rates rise.
An adjustable-rate mortgage (ARM) starts with a lower rate for a set period—typically 3, 5, 7, or 10 years—then adjusts annually based on market conditions. After the initial period, your payment can rise significantly. ARMs are riskier because you cannot predict your payment after the fixed period ends. They make sense only if you plan to sell or refinance before the rate adjusts, or if you are confident you can absorb a higher payment later. For most borrowers buying a home to stay in, a fixed rate is the safer choice.
Frequently Asked Questions
What if I want to pay off the mortgage faster than 30 years?
You can make extra payments toward principal at any time without penalty on most mortgages. Paying an extra $200 or $300 per month can cut years off your loan and save tens of thousands in interest. Ask your lender whether they allow prepayment without a fee, and request that extra payments go directly to principal, not toward your next scheduled payment.
Does my credit score affect the interest rate I get?
Yes. Borrowers with credit scores above 740 typically get the lowest rates, while those below 680 pay 0.5 to 1.5 percentage points higher. On a $300,000 loan, that difference is $150 to $450 per month. If your score is lower, improving it before you explore—by paying down debt or fixing errors on your credit report—can save you significant money.
Can I change my loan term after I close?
You can refinance to a different term, but that means taking out a new loan and paying closing costs again, typically 2 to 5 percent of the loan amount. Refinancing makes sense if rates have dropped or if your financial situation has changed enough to justify the cost. For most people, choosing the right term at the start is simpler than refinancing later.
What happens if I miss a payment?
Missing a payment triggers late fees and can damage your credit score. After 30 days, the lender reports it to credit bureaus. After 90 days, you risk foreclosure proceedings. If you foresee trouble, contact your lender when ready—many offer forbearance or loan modification programs that can pause or reduce payments temporarily.