Mortgage Extra Payment Calculator

Calculate extra mortgage payment impact: see new payoff, interest saved and amortization with extra monthly.

Mortgage Extra Payment Calculator

Calculate extra mortgage payment impact: see new payoff, interest saved and amortization with extra monthly.

Current balance($)

Annual rate(%)

Remaining years

Extra per month($)

Enter values above and click Calculate — results will appear here with the formula explained.

Standard P = balance*r*(1+r)^n/((1+r)^n-1); With extra, iterate deducting extra from principal

How does this work?

This simulates extra principal each month, reducing balance faster and cutting total interest. Extra early saves more than late due to compounding on higher balance.

Assumes fixed rate, extra always to principal, no prepayment penalty. Check lender applies correctly.

For YMYL mortgage decisions, compare extra payment vs investing at expected return. High rate mortgages often beat market, low rate may not. Run both scenarios.

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Disclaimer: Results are estimates for informational purposes only and do not constitute professional financial advice.

Quick Answer

Mortgage Extra Payment Calculator computes calculate extra mortgage payment impact: see new payoff, interest saved and amortization with extra monthly. Formula: Standard P = balance*r*(1+r)^n/((1+r)^n-1). Example: With $300k at 6.

How to Use This Calculator

1Enter current mortgage balance, annual rate, remaining years and extra monthly amount you can pay.
2Calculate to see new payoff time in years and months, time saved and total interest saved over the loan.
3Try increasing extra from $200 to $500 to see diminishing returns and optimal extra for your budget.

Formula Used

Standard P = balance*r*(1+r)^n/((1+r)^n-1); With extra, iterate deducting extra from principal

This simulates extra principal each month, reducing balance faster and cutting total interest. Extra early saves more than late due to compounding on higher balance.

Assumes fixed rate, extra always to principal, no prepayment penalty. Check lender applies correctly.

For YMYL mortgage decisions, compare extra payment vs investing at expected return. High rate mortgages often beat market, low rate may not. Run both scenarios.

AdSense ready — add NEXT_PUBLIC_GOOGLE_ADSENSE_PUBLISHER_ID

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Worked Example

With $300k at 6.5% for 25y, payment $2,010. Adding $500/mo pays off in ~17y, saving 8 years and about $92k interest.

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Frequently Asked Questions

QWhere does extra go?

To principal, reducing balance. Confirm lender applies correctly, not to escrow or future payments.

QBiweekly half payments?

26 half-payments equals 13 full yearly, similar to one extra monthly. Use extra field to model this effect.

QInvest instead of extra?

Compare mortgage rate to expected investment return. If mortgage 6.5% and market 7%, extra may still win due to risk-free return.

How to Use This Calculator

1Enter current mortgage balance, annual rate, remaining years and extra monthly amount you can pay.

2Calculate to see new payoff time in years and months, time saved and total interest saved over the loan.

3Try increasing extra from $200 to $500 to see diminishing returns and optimal extra for your budget.

Formula Used

Standard P = balance*r*(1+r)^n/((1+r)^n-1); With extra, iterate deducting extra from principal

This simulates extra principal each month, reducing balance faster and cutting total interest. Extra early saves more than late due to compounding on higher balance.

Assumes fixed rate, extra always to principal, no prepayment penalty. Check lender applies correctly.

For YMYL mortgage decisions, compare extra payment vs investing at expected return. High rate mortgages often beat market, low rate may not. Run both scenarios.

Frequently Asked Questions

QWhere does extra go?

To principal, reducing balance. Confirm lender applies correctly, not to escrow or future payments.

QBiweekly half payments?

26 half-payments equals 13 full yearly, similar to one extra monthly. Use extra field to model this effect.

QInvest instead of extra?

Compare mortgage rate to expected investment return. If mortgage 6.5% and market 7%, extra may still win due to risk-free return.