Early repayment involves paying more than the scheduled amount on a loan, which reduces the principal balance faster. Because interest is charged on the remaining balance, every extra dollar paid early saves you the interest that would have accrued on that dollar for the rest of the loan term. This can result in saving thousands of dollars and years of time.

Visualize the "What-if" impact of extra monthly payments or lump sums.

Formula

Interest Saved = Total Original Interest - Total New Interest. Monthly Interest = Remaining Balance * (Annual Rate / 12).

How It Works

Input your current remaining loan balance and interest rate.
Adjust the years remaining to match your current amortization schedule.
Enter an "Extra Monthly Payment" or a "One-Time Lump Sum" to see the impact.
Review the "Interest Saved" and "Time Saved" instantly as you adjust the sliders.

Formula:

Interest Saved = Original Interest - New Interest (simulated month-by-month reduction).

Examples

$200,000 mortgage at 5% with 20 years left. Add $500 monthly.

Result: $64,285 interest saved. 8.4 years shaved off the loan.

$150,000 loan at 6% with 15 years left. $20,000 lump sum today.

Result: $34,152 interest saved. 3.2 years shaved off.

Frequently Asked Questions

Should I pay off debt or invest?

Generally, if your loan interest rate is higher than your expected investment return (e.g., 7% mortgage vs 5% savings), paying off debt is mathematically superior.

Are there prepayment penalties?

Some fixed-rate mortgages or smaller personal loans have penalties if you pay off the bulk of the loan too early. Check your contract.

Does rounding up my payment matter?

Yes! Even rounding a $1,740 payment to $2,000 can save tens of thousands in interest over a 30-year term.

Can I reuse this for a credit card?

Yes. Enter your credit card balance and the high interest rate (e.g., 20%) to see how fast you can get out of debt.

Key facts

Extra payments applied to the principal provide an immediate, risk-free return equal to the loan's interest rate. Early repayments are most effective in the first half of the loan term, where interest charges are highest. Some loans have prepayment penalties; always verify your terms before starting a payoff plan. Common strategies include rounding up monthly payments or applying annual bonuses as lump sums.

Trend & Behavior Analysis

The "Time Saved" (X-axis) increases disproportionately faster than the "Extra Payment" (Y-axis) in the initial stages. A small 10% increase in monthly payment can often reduce a 30-year term by as much as 5 to 7 years.