MortgageFlex

Mortgage Overpayment Calculator

Compare standard repayment vs. extra monthly overpayments in real-time.

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Mortgage Parameters

$300,000
25 yrs
4.5%
$200
Standard Monthly Payment$1,667
Total Monthly (P+I + Extra)$1,867
Interest Saved
$40,065

lifetime savings

Time Reduced
4y 5m

payoff time saved

Standard Total Interest
$200,249

without overpaying

New Payoff Date
March 2047

53 months early

Loan Payoff Balance: Standard (Red) vs Overpaid (Green)

Standard Schedule With Overpayment
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Compound Interest Reduction

Every extra dollar directly reduces your remaining principal. Less principal means lower compound interest charged every single month.

Guaranteed Risk-Free Return

Overpaying a 4.5% mortgage delivers an effective 4.5% tax-free, risk-free return on capital superior to traditional savings accounts.

The Cost of Not Overpaying

Without overpayments, tens of thousands of dollars are paid purely in bank interest over a 25 or 30 year mortgage term.

Frequently Asked Questions

Are there penalties for overpaying my mortgage?
Most mortgages allow up to 10% of the remaining balance to be overpaid each year without early repayment charges. Check your lender agreement to confirm your limit.
Does overpaying lower monthly payments or shorten the term?
By default, overpayments shorten the total loan term while keeping regular monthly payments identical. Some lenders allow you to request a recast to lower monthly payments instead.
How is the interest savings calculated?
Interest is calculated on the remaining balance using standard monthly compounding. Principal reductions directly decrease compound interest accumulation.