The monthly payment on a $150,000 house ranges from roughly $700 to $1,100, depending on your interest rate, loan term, and down payment size.
A mortgage payment covers four things: principal (the amount borrowed), interest (the lender's cost), property taxes, and homeowners insurance. The first two are locked in when you sign. The last two vary by location and your home's value. Most calculators show you principal and interest only, which is why the real number often surprises people.
The examples below assume you are putting 20 percent down ($30,000) and borrowing $120,000 over 30 years. Interest rates shown are current ranges, though your actual rate depends on your credit score, debt-to-income ratio, and the lender you choose.
Key Takeaways
- A $120,000 loan (20 percent down on $150,000) costs between $570 and $850 per month in principal and interest alone, depending on whether your rate is 6 percent or 8 percent.
- Property taxes and homeowners insurance typically add $200 to $400 per month, pushing your total payment to $800 to $1,100 or higher.
- Putting down less than 20 percent means you pay mortgage insurance (PMI), which adds $100 to $300 monthly until you reach 20 percent equity.
- Your actual rate depends on your credit score, debt-to-income ratio, and current market conditions — shopping with at least three lenders can save you thousands over the life of the loan.
Principal and Interest on a $120,000 Loan
If you borrow $120,000 at a 6 percent interest rate over 30 years, your monthly payment is approximately $720. At 7 percent, it rises to $798. At 8 percent, it reaches $880. These numbers change if you choose a 15-year loan instead: at 6 percent, a 15-year loan costs about $844 per month; at 8 percent, roughly $955.
The difference between a 6 percent and 8 percent rate on a 30-year loan is $160 per month — or $57,600 over the life of the loan. This is why your credit score and shopping around matter so much. A score of 760 or higher typically gets you the lowest rates; a score below 620 may cost you 1 to 2 percentage points more.
Property Taxes and Insurance
Property taxes vary widely by state and county. New Jersey and Illinois average around 0.8 to 1 percent of home value annually; Texas and Florida average 0.4 to 0.6 percent. On a $150,000 house, that means anywhere from $50 to $150 per month. Your county assessor's office can tell you the exact rate for the address you are considering.
Homeowners insurance typically costs $800 to $1,500 per year, or $65 to $125 per month. Older homes, homes in flood zones, and homes in areas with high theft or weather risk cost more. Get quotes from at least three insurers before you buy; the difference between the cheapest and most expensive can be $300 per year.
Mortgage Insurance (PMI) If You Put Down Less Than 20 Percent
If you put down 10 percent ($15,000) instead of 20 percent, you borrow $135,000 and must pay mortgage insurance. PMI typically costs 0.5 to 1.5 percent of the loan amount annually, depending on your credit score and down payment size. On a $135,000 loan, that is $56 to $169 per month.
PMI drops off automatically once you reach 20 percent equity in the home — usually after 10 to 12 years of payments on a 30-year loan. You can also request removal earlier if your home has appreciated and you have paid down the principal. Ask your lender about the exact terms when you lock in your rate.
What Changes Your Rate
Your interest rate depends on five main factors: your credit score, your debt-to-income ratio, the size of your down payment, the loan term (15 or 30 years), and current market conditions. A credit score of 740 or higher usually qualifies you for the best published rates. A ratio of debt to income above 43 percent may disqualify you or raise your rate.
Market conditions shift weekly. Rates are set by the Federal Reserve's decisions, inflation data, and bond markets — not by individual lenders. This means all lenders offer roughly the same rates on a given day, but they differ in fees and closing costs. A lender charging $2,000 in fees at 6.5 percent may be more expensive overall than one charging $4,000 at 6.25 percent, depending on how long you keep the loan.
How to Compare Offers from Different Lenders
Contact at least three lenders — a bank, a credit union, and a mortgage broker — and ask for a Loan Estimate for the same loan terms. The Loan Estimate is a standardized form that shows your interest rate, monthly payment, closing costs, and all fees. Compare the total cost of the loan, not just the rate.
A lower rate does not always mean a lower total cost if the fees are higher. If Lender A offers 6.5 percent with $2,000 in fees and Lender B offers 6.75 percent with $500 in fees, Lender B may save you money over 30 years. Use an online calculator to add the fees to the total interest paid, then divide by the number of months you plan to keep the loan.
Down Payment Size and Total Cost
| Down Payment | Amount Borrowed | Principal + Interest (6%) | PMI (if applicable) | Total Monthly (P+I+PMI) |
|---|---|---|---|---|
| 5% ($7,500) | $142,500 | $855 | $190 | $1,045 |
| 10% ($15,000) | $135,000 | $810 | $113 | $923 |
| 15% ($22,500) | $127,500 | $765 | $64 | $829 |
| 20% ($30,000) | $120,000 | $720 | $0 | $720 |
The table above shows principal and interest only at 6 percent over 30 years. Add property taxes and insurance to get your true monthly cost. A 5 percent down payment saves you $22,500 upfront but costs you roughly $190 per month in PMI alone — $68,400 over 30 years. A 10 percent down payment is often a middle ground: you avoid the highest PMI rates and keep more cash on hand than a 20 percent down payment requires.
The choice between down payment sizes depends on your cash reserves and risk tolerance. If you put down 5 percent and lose your job six months later, you have less cushion than someone who put down 20 percent. Conversely, if you have stable income and investment opportunities that return more than your mortgage rate, keeping cash invested may make financial sense.
Frequently Asked Questions
What is the difference between a 15-year and 30-year mortgage?
A 15-year mortgage has a higher monthly payment but costs far less in total interest. On a $120,000 loan at 6 percent, a 15-year mortgage costs about $844 per month versus $720 for a 30-year mortgage — but you pay roughly $51,840 in interest over 15 years instead of $139,000 over 30 years. Choose 15 years only if you can afford the higher payment without strain.
Can I lock in my interest rate before I find a house?
Yes, most lenders offer rate locks for 30 to 60 days. A lock guarantees your rate will not change if market rates rise, but you lose the benefit if rates fall. Lock your rate once you have a signed purchase agreement and a clear closing date, not before — locking too early costs you money if the deal falls through.
What happens if interest rates drop after I close?
You can refinance your loan, which means taking out a new mortgage to pay off the old one. Refinancing costs $2,000 to $5,000 in closing costs, so it only makes sense if rates drop at least 0.5 to 1 percent and you plan to stay in the home long enough to recoup those costs. Use a refinance calculator to compare your current payment to the new one.
Does my credit score really change my rate that much?
Yes. A borrower with a 760 credit score might get 6 percent, while a borrower with a 620 score might get 7.5 percent on the same loan. That 1.5 percent difference costs an extra $180 per month on a $120,000 loan — or $64,800 over 30 years. Paying down debt and disputing errors on your credit report before you apply can save you thousands.
What if I want to pay off my mortgage early?
You can make extra payments toward principal at any time without penalty on most mortgages. Paying an extra $100 per month on a $120,000 loan at 6 percent cuts about five years off your loan and saves roughly $40,000 in interest. Ask your lender whether they charge a prepayment penalty — most do not, but some older loans do.