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Mortgage Calculator with Extra Payments

Making extra payments on your mortgage is one of the most powerful ways to build wealth. Even a small additional payment each month can shave years off your loan and save tens of thousands of dollars in interest. The key is understanding how extra payments interact with your amortization schedule.

Our Mortgage Calculator with Extra Payments lets you model any extra payment strategy: a fixed additional amount each month, a yearly lump sum (like a tax refund or bonus), or a one-time extra payment. The calculator shows exactly how many months you'll cut from your loan term and how much total interest you'll save.

For example, on a $300,000 loan at 6.5% for 30 years, adding just $200 per month in extra principal payments reduces the loan term by 7 years and 4 months and saves over $97,000 in interest. That's a remarkable return for less than the cost of a daily coffee run.

Loan Details

?The purchase price of the home you're considering buying.
?The amount you plan to pay upfront when purchasing the home.
?The annual interest rate on your mortgage loan.
?The length of your mortgage in years. Common terms are 15 or 30 years.
?The annual property tax rate as a percentage of home value.
?Annual homeowners insurance premium.
?Monthly homeowners association (HOA) fees, if applicable.
End of inputs

Results

Monthly Payment
$2,505.96

Total / month

Loan Amount
$320,000.00

After down payment

Total Interest
$408,140.64

Over 30 years

Monthly Payment Breakdown
Amortization Schedule
Payment Schedule
MonthPrincipalInterestBalance

360 months · Showing 0 rows

Key Insights
Over the life of this loan you'll pay $408,140.64 in interest — more than the principal itself. A shorter loan term or biweekly payments could dramatically reduce this cost.
Making one extra payment per year (about $168.55/month) could save approximately $92,703.42 in interest and pay off your loan 5.8 years earlier.
Your interest rate of 6.50% is in line with recent market averages. Shopping around with at least three lenders could still save you thousands over the life of the loan.
Your down payment of 20% or more means you avoid Private Mortgage Insurance (PMI) entirely — a saving of hundreds of dollars per month.
Your down payment of 20.00% is strong, giving you immediate equity in your home and helping you secure better loan terms.

Frequently Asked Questions

How do extra payments reduce my mortgage term?

Extra payments go directly toward reducing your loan principal. Since interest is calculated on the remaining balance, every extra dollar you pay reduces the base on which future interest accrues. This creates a compounding effect: each extra payment saves interest every month for the rest of the loan, accelerating your payoff timeline.

Should I make extra payments or invest the money instead?

Compare your mortgage interest rate to your expected investment return. If your mortgage rate is 6.5% and you expect 7-10% from diversified stock investments over the long term, investing may be mathematically better. However, paying down the mortgage is a guaranteed, risk-free return. Many people do both: invest for retirement while making modest extra mortgage payments.

Is biweekly mortgage payment worth it?

A biweekly payment plan results in 26 half-payments per year, which equals 13 full monthly payments instead of 12 — effectively one extra payment annually. On a $300,000 loan at 6.5% for 30 years, this cuts about 5 years off the term and saves roughly $74,000 in interest. Check that your servicer applies biweekly payments immediately rather than holding them; some charge fees for biweekly programs.

Are there prepayment penalties on mortgages?

Most modern conventional, FHA, VA, and USDA loans do not have prepayment penalties — they're prohibited by law for primary residence loans. However, some non-qualified mortgages and certain investment-property loans may include prepayment penalties for the first 1-3 years. Always review your loan estimate and closing disclosure for a prepayment penalty clause before making extra payments.

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