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Loan Payoff, Extra Repayment & Amortization Schedule Calculator

Calculate time and interest saved by making extra monthly contributions or lump-sum repayments.

Input Parameters

$
%
years
$/mo
$

Calculation Results

Standard Minimum Repayment
$2,968.51 / month
Accelerated Total Repayment
$3,218.51 / month (+$250/mo extra)
Total Interest Saved
$83,435 saved
Time Saved to Debt Freedom
4.1 years sooner (49 months)
Accelerated Loan Payoff Term
20.9 years (down from 25 yrs)
Total Interest Paid (Accelerated)
$357,119 (Standard: $440,554)
Summary: By adding $250/month in extra repayments, you will pay off your $450,000 loan in 20.9 years (4.1 years sooner) and save $83,435 in total bank interest.

Visual Growth Breakdown

Step-by-Step Calculation Solution
1.Monthly Interest Rate (r) = 6.25% / 12 = 0.5208%
2.Standard Minimum Payment (M) = P × [r(1+r)ⁿ] / [(1+r)ⁿ - 1] = $2968.51/month
3.Accelerated Payment = $2968.51 + $250 = $3218.51/month
4.Payoff Horizon = 251 months (20.9 years)
5.Total Interest Saved = Standard Interest ($440554) - Accelerated Interest ($357119) = $83435

Formula & How Loan Payoff, Extra Repayment & Amortization Schedule Calculator Works

Mathematical Formula
M = P × [r(1+r)ⁿ] / [(1+r)ⁿ - 1] | Interest_m = Balance × r | Principal_m = (M + Extra) - Interest_m

Because loan interest is calculated daily on the remaining principal balance, any extra payments made above the standard minimum repayment directly reduce the principal balance. This creates a compounding savings effect that rapidly accelerates loan payoff and shaves years off the loan term.

How to Calculate Loan Payoff, Extra Repayment & Amortization Schedule Calculator (Step-by-Step)
  1. Enter Current Loan Balance ($) ($): Input your target parameter value.
  2. Enter Annual Interest Rate (% p.a.) (%): Input your target parameter value.
  3. Enter Remaining Loan Term (Years) (years): Input your target parameter value.
  4. Enter Extra Monthly Repayment ($/month) ($/mo): Input your target parameter value.
  5. Enter One-Off Lump Sum Payment ($) ($): Input your target parameter value.
  6. Apply Formula: Calculate using M = P × [r(1+r)ⁿ] / [(1+r)ⁿ - 1] | Interest_m = Balance × r | Principal_m = (M + Extra) - Interest_m.
  7. Review Results: View exact computed answers, metrics, and worked mathematical proofs.
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Frequently Asked Questions (FAQs)

How much does paying an extra $100 per month save on a mortgage?

On a $500,000 30-year home loan at 6.0%, paying an extra $100 per month saves over $45,000 in total interest and cuts almost 3 years off the mortgage term.

Is it better to pay extra monthly or make a one-off lump sum?

The earlier money is paid toward the principal, the more total interest is saved over time. A lump sum made in year 1 provides greater long-term compound savings than the same lump sum made in year 10.

Official Regulatory & Government Data Sources

Authoritative Standards & Verified Reference Citations

Independent & Verified

Calculations and mathematical logic on this page are grounded in published statutory rules, regulatory standards, and official government data published by the following bodies:

Moneysmart (ASIC)Government
Australian Securities and Investments Commission

Consumer guidance on mortgage borrowing capacity, compound interest formulas, and loan fees.

moneysmart.gov.au
Reserve Bank of Australia (RBA)Government
Australia's Central Bank

Official cash rate target announcements, monetary policy statements, and national economic statistical data.

www.rba.gov.au
Australian Prudential Regulation Authority (APRA)Regulatory
Australian Banking & Prudential Regulator

Residential mortgage serviceability buffer framework (3.0% stress test hurdle rate).

www.apra.gov.au

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