How much interest do extra monthly mortgage principal payments save over 30 years?

Adding just $150 to $250 extra per month on a $350,000 30-year mortgage at 6.5% interest typically saves $65,000+ in total interest and cuts 5 to 7 years off your loan.

What is the mathematical difference between extra monthly payments and annual lump sums?

Extra monthly payments compound immediate principal reduction every 30 days, saving slightly more interest than waiting to make a single annual lump sum payment at year-end.

Does paying off a low-rate mortgage early beat investing in index funds?

If your mortgage rate is below 4%, investing surplus cash in diversified index funds (historic 8%-10% nominal return) historically yields higher net worth than accelerating mortgage payoff.

Home Loan & Mortgage Wealth

Mortgage Amortization & Extra Payment Sizer

See how adding even $100 or $250/mo in extra principal eliminates years of mortgage debt and saves tens of thousands in predatory compound interest.

Loan Parameters

Mortgage Principal Loan Amount

Interest Rate (%)

Loan Term

Accelerated Payoff Strategy

Extra Monthly Principal

Annual Lump Sum Payment

Payoff Acceleration Impact

Base P&I Payment $2,594 per month

Interest Saved $112,450 Total Savings

Time Shaved Off 6.4 Yrs Debt Free Earlier

New Payoff Term 23.6 Yrs vs 30.0 Yrs

Year	Principal Paid	Interest Paid	Extra Paid	Ending Balance

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Mortgage Amortization & Extra Payment Sizer

Loan Parameters

Accelerated Payoff Strategy

Payoff Acceleration Impact Export Schedule (CSV)

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Payoff Acceleration Impact