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Mortgage Overpayment Calculator

See how much interest you save — and years you cut — by overpaying your mortgage.

Your Mortgage

$
$
$
Interest Saved
Years Saved
New Payoff Date
Metric
Without Overpay
With Overpay
Monthly Payment
Total Interest
Total Cost
Term

Interest vs Principal Breakdown

Without overpayment
With overpayment

Balance Over Time

How your outstanding balance reduces with and without overpayments.

Amortisation Summary

Year Balance (Base) Balance (Overpay) Interest Paid (Base) Interest Paid (Overpay)
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Want to put these savings to work?
If you're weighing overpaying vs investing, here are your options.
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Frequently Asked Questions

How much can I save by overpaying my mortgage?
Even small regular overpayments can save tens of thousands in interest. A $200,000 mortgage at 4% over 25 years can save over $20,000 and cut 4+ years off the term with a $200/month overpayment.
Are there limits on mortgage overpayments?
Most lenders allow up to 10% of the outstanding balance per year without an early repayment charge (ERC). Check your mortgage terms before making lump-sum overpayments, as charges can apply on fixed-rate products.
Should I overpay my mortgage or invest instead?
If your mortgage rate is higher than the after-tax return you could earn investing, overpaying is the better choice. Many people split the difference — overpaying to some extent while also building an investment portfolio.
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