Monthly vs Lump Sum Mortgage Overpayment Guide
When you have extra cash available to pay down your mortgage faster, you can choose between two main strategies: adding a fixed recurring amount to every monthly check or making larger lump-sum principal payments when you receive an annual bonus or tax refund.
Both methods dramatically reduce lifetime interest, but timing influences the exact dollar savings.
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Comparing Strategy A vs Strategy B
Suppose you have $2,400 per year available to pay down a $300,000 mortgage at 6.5% interest:
- Strategy A (Monthly Overpayment): Add $200.00 to your payment every single month.
- Strategy B (Lump Sum Overpayment): Make one single $2,400.00 extra payment at the end of each year.
Because interest compounds monthly, paying $200 every month (Strategy A) reduces your balance earlier throughout the year, saving roughly $1,200 to $1,800 more in lifetime interest compared to waiting until year-end (Strategy B).
Key Things to Verify Before Overpaying
Before sending extra funds to your lender, confirm that your mortgage has no prepayment penalties and ensure your online payment portal marks the overpayment explicitly as "Principal Only".
Simulate both overpayment methods for free with our Mortgage Overpayment Calculator.
