Precision Utility
Mortgage Overpayment
Calculator
Prepay Penalty
None*
Biweekly Saves
4-5 yrs
See how much you could save by making extra payments on your mortgage. Enter your current balance, interest rate, remaining term and extra payment amount — the calculator shows your interest savings, time knocked off the loan and your new payoff date. Toggle biweekly payments to see how paying every two weeks can shorten your mortgage even further.
Extra Payment Details
Biweekly Payments
Pay half every 2 weeks (13 payments/year)
No Prepayment Penalty
Since the Dodd-Frank Act (2014), most US residential mortgages — including conventional, FHA and VA loans — have no prepayment penalty. Extra payments go directly toward your principal balance. Check your loan documents to confirm.
Interest Saved
$0
Time Saved
0 months
New Payoff Date
—
Original Total Cost
$0
New Total Cost
$0
Current Monthly
$0
New Monthly (with extra)
$0
How the mortgage overpayment calculator works
Enter your current mortgage balance, interest rate and remaining term. Then add a monthly extra payment, a one-time lump sum, or both. The calculator runs two amortization schedules side by side — one without extra payments and one with — so you can see exactly how much time and money you save.
Choose between two strategies. Reduce term keeps your current monthly payment the same but adds your extra payment on top, so you pay off your mortgage sooner. Reduce payment recalculates your monthly payment over the same term but with the lower balance, giving you smaller bills each month.
Toggle biweekly payments to see the effect of paying half your monthly amount every two weeks. Because there are 52 weeks in a year, this results in 26 half-payments — equivalent to 13 full monthly payments instead of 12. That one extra payment per year can take years off your mortgage.
The lump sum is applied immediately to your outstanding balance before the monthly extra payment schedule begins. This means interest starts accruing on a smaller amount right away, maximizing your savings.
What you need to know about extra mortgage payments
Making extra payments on your mortgage is one of the most effective ways to build equity faster and reduce the total cost of your home loan. Every dollar of extra payment goes directly toward reducing your principal balance, which means less interest accrues each month — a compounding savings effect.
Key points for US homeowners:
- Most US mortgages have no prepayment penalty since the Dodd-Frank Act (2014) — you can make extra payments freely
- Extra payments reduce your principal, not future payments — your monthly due amount stays the same unless you recast
- Mortgage recasting lets you recalculate your monthly payment after a large lump sum, typically for a $150–$300 fee
- The biweekly strategy effectively makes one extra full payment per year without feeling the pinch
- When making extra payments, specify to your servicer that the extra amount should go toward principal, not interest
Before making extra mortgage payments, make sure you have paid off any higher-interest debt (credit cards, auto loans) and have an emergency fund of 3–6 months' expenses. If your mortgage rate is low compared to potential investment returns, investing the extra money may be more beneficial over the long term.
Frequently asked questions
Do US mortgages have prepayment penalties?
Since the Dodd-Frank Act of 2014, prepayment penalties on most residential mortgages have been effectively banned. Qualified mortgages (QM) cannot carry prepayment penalties after the first three years. Most conventional, FHA and VA loans have no prepayment penalty at all, so you can make extra payments freely.
How do extra mortgage payments reduce my loan?
Extra payments go directly toward your principal balance. Since interest is calculated on the remaining principal each month, reducing that balance means less interest accrues going forward. This creates a compounding savings effect — the earlier you start making extra payments, the more you save over the life of the loan.
What is the biweekly mortgage payment strategy?
Instead of making 12 monthly payments per year, you make 26 half-payments (one every two weeks). This equals 13 full payments per year — one extra payment annually. On a 30-year mortgage, this strategy alone can cut roughly 4–5 years off your loan and save tens of thousands in interest.
Should I make extra mortgage payments or invest the money?
If your mortgage rate is lower than the expected return on investments (historically around 7–10% for stocks), investing may yield more over time. However, paying off your mortgage offers a guaranteed, risk-free return equal to your interest rate. Consider your risk tolerance, tax situation and financial goals.
How much can I save by paying extra on my mortgage each month?
The savings depend on your balance, rate and extra payment amount. For example, paying an extra $200 per month on a $300,000 mortgage at 6.5% over 30 years could save you over $100,000 in interest and shorten your loan by about 7 years. Use the calculator above for your specific numbers.
Does a lump sum payment reduce my monthly payment?
With most US mortgages, a lump sum payment reduces your principal balance but your monthly payment stays the same — you simply pay off the loan sooner. Some lenders allow you to recast (re-amortize) your mortgage after a large lump sum payment, which recalculates your monthly payment at a lower amount over the remaining term.
What is mortgage recasting and how does it differ from refinancing?
Recasting keeps your existing loan terms and interest rate but recalculates your monthly payment based on the reduced balance after a lump sum payment. Refinancing replaces your entire loan with a new one at a new rate. Recasting is cheaper (typically $150–$300 fee) and doesn't require a credit check or appraisal.