Your monthly payment on a $100,000 mortgage typically falls between $480 and $860, depending on your interest rate and loan length
The exact amount depends on three things: how much interest the lender charges you (your interest rate, usually between 3% and 8% right now), how many years you have to pay it back (your loan term, most commonly 15 or 30 years), and whether your payment includes property taxes and insurance (called PITI — principal, interest, taxes, and insurance).
The examples below show what you would pay each month for just the principal and interest part. Your actual bill will be higher if your lender requires you to pay taxes and insurance through an escrow account — a separate fund the lender holds and uses to pay those bills on your behalf.
Key Takeaways
- A $100,000 mortgage at 6% interest costs about $600 per month over 30 years, or $844 per month over 15 years — before taxes and insurance.
- Every 1% change in interest rate changes your monthly payment by roughly $100 on a 30-year loan.
- Property taxes and homeowners insurance can add $200 to $400 or more to your monthly bill, depending on your location and the home's value.
- Your lender will show you the exact payment for your specific rate and term before you commit to the loan.
How interest rate affects your monthly payment
The interest rate is the single biggest factor in what you pay each month. A higher rate means you pay more interest over the life of the loan, which raises your monthly bill.
On a $100,000 mortgage over 30 years, here is what the monthly payment (principal and interest only) looks like at different rates:
| Interest Rate | Monthly Payment (30 years) | Monthly Payment (15 years) |
|---|---|---|
| 3% | $477 | $690 |
| 4% | $537 | $740 |
| 5% | $599 | $791 |
| 6% | $664 | $844 |
| 7% | $731 | $899 |
| 8% | $801 | $956 |
Notice that a 1% increase in rate raises your payment by roughly $60 to $70 per month on a 30-year loan. That difference compounds over 30 years — at 3% you pay about $171,720 total, but at 8% you pay about $288,360 total for the same $100,000 borrowed.
How loan length changes what you owe each month
A 15-year mortgage has a higher monthly payment than a 30-year mortgage, but you pay off the loan twice as fast and pay far less interest overall. A 30-year mortgage spreads the cost across more months, so each payment is smaller — but you pay interest for twice as long.
Using a 6% interest rate as an example: a 30-year loan costs $664 per month and totals about $239,040 in principal and interest combined. A 15-year loan costs $844 per month but totals only about $151,920. You pay $180 more per month on the 15-year loan, but you save about $87,000 in total interest and own the home free and clear 15 years sooner.
Some borrowers choose a 20-year or 25-year term as a middle ground, though 15 and 30 remain the most common. Your lender will show you the payment for whatever term you choose.
What taxes and insurance add to your bill
Your monthly mortgage payment to the lender covers only principal and interest. If you put down less than 20% of the home's purchase price, your lender will require you to also pay property taxes, homeowners insurance, and possibly mortgage insurance (called PMI) through the same monthly bill.
Property taxes vary widely by location — they might be 0.5% of the home's value per year in one county and 2% in another. On a $100,000 home, that could mean anywhere from $40 to $160 per month. Homeowners insurance typically costs $800 to $1,500 per year, or roughly $65 to $125 per month. If you put down less than 20%, PMI might add another $50 to $150 per month depending on your down payment size and credit score.
So your actual monthly bill could easily be $800 to $1,100 or more, even though the principal and interest alone is only $664. Ask your lender for a Loan Estimate — a form that shows all these costs broken down — before you commit to a loan.
How your down payment affects the loan amount
The examples above assume you are borrowing the full $100,000. If you are buying a home for $100,000 and putting down 10%, you would actually borrow $90,000, and your payment would be 10% lower. If you put down 20%, you would borrow $80,000.
A larger down payment lowers your monthly payment in two ways: you borrow less money, and you avoid PMI entirely (most lenders waive it once you put down 20%). On a $100,000 home purchase, putting down 20% instead of 10% could save you $100 to $150 per month or more.
Fixed rate versus adjustable rate mortgages
A fixed-rate mortgage keeps the same interest rate for the entire loan — 15 years, 30 years, or whatever term you choose. Your monthly payment never changes (except for taxes and insurance, which can go up). This makes budgeting predictable.
An adjustable-rate mortgage (ARM) starts with a lower interest rate for a set period (often 3, 5, 7, or 10 years), then adjusts up or down based on market rates. Your payment can increase significantly after the initial period ends. ARMs are riskier because you cannot predict what your payment will be in the future, but they can save money if you plan to sell or refinance before the rate adjusts.
Most first-time borrowers choose a fixed-rate mortgage because the payment is predictable and easier to budget for.
How to calculate your own payment
If you want to see what different rates and terms would cost you, most lenders and mortgage websites have a mortgage calculator where you enter the loan amount, interest rate, and term. The calculator shows you the monthly payment when ready.
You can also ask a lender directly. When you contact a bank, credit union, or mortgage broker, they can quote you a specific rate and show you the exact payment for that rate. The rate they quote is usually good for 30 to 45 days, so you have time to compare offers from multiple lenders before deciding.
Frequently Asked Questions
Does the monthly payment include property taxes?
Not automatically. If you put down 20% or more, you pay taxes and insurance separately. If you put down less than 20%, your lender usually requires you to pay them through an escrow account, which means they are included in your monthly bill to the lender — but they are listed separately on your statement so you can see what portion goes to taxes versus interest.
What if I want to pay off the loan faster?
You can make extra payments toward principal at any time without penalty on most mortgages. Some borrowers pay bi-weekly instead of monthly, which results in one extra payment per year and shortens the loan by several years. Ask your lender whether they allow this and whether there are any fees.
Can I refinance if interest rates drop?
Yes. Refinancing means taking out a new loan to pay off the old one. If rates drop, you can refinance at the lower rate and lower your monthly payment. There are closing costs involved (typically 2% to 5% of the loan amount), so refinancing only makes sense if you will stay in the home long enough to recoup those costs through lower payments.
What credit score do I need to get the best rate?
Lenders typically offer the lowest rates to borrowers with credit scores of 740 or higher. Scores between 620 and 740 usually may have access to for a loan but at higher rates. The exact rate depends on the lender, the loan type, and current market conditions — there is no single "best" rate that applies to everyone.
How much house can I afford with a $100,000 mortgage?
That depends on your down payment. If you put down 10%, you can afford a $111,000 home. If you put down 20%, you can afford a $125,000 home. Most lenders also want your total monthly debt (mortgage, car loans, credit cards, student loans) to be no more than 43% of your gross monthly income, so your income matters too.