Unlock significant savings and gain financial freedom faster with our Mortgage Overpayment Calculator. By making even small extra payments, you can drastically reduce the total interest paid and shorten your loan term. This tool helps you visualize the powerful impact of overpaying on your mortgage and empowers you to make informed financial decisions. See your potential savings today!
Formula:
The Mortgage Overpayment Calculator functions by first determining your existing loan's monthly payment and total interest based on your current balance, interest rate, and remaining term. It then recalculates these figures, incorporating your specified overpayment amount.
The core principle is that any overpayment directly reduces your principal balance, meaning future interest is calculated on a smaller amount. This accelerates your loan repayment schedule.
Key Variables:
- P (Principal): Your current outstanding mortgage balance.
- i (Interest Rate): Your monthly interest rate (annual rate / 12 / 100).
- n (Number of Payments): Total number of remaining monthly payments.
- M (Monthly Payment): Your standard calculated monthly payment.
- Mnew (New Monthly Payment): Your standard monthly payment plus your overpayment.
This calculator uses standard amortization formulas to compare the total interest and loan term under both scenarios:
- Original Monthly Payment (M):
M = P * [i * (1 + i)^n] / [(1 + i)^n - 1] - New Number of Payments (nnew):
nnew = -log(1 - (P * i) / Mnew) / log(1 + i)