Early Repayment Charge Calculator: Estimate the Cost

An early repayment charge (ERC) calculator estimates the charge on a loan or mortgage when you repay some or all of it before a specified date. Enter the amount being repaid, the charge rate, and the remaining charge period to estimate a simple time-proportional fee; check your agreement for the actual calculation method.

Formula

This calculator uses a simple proportional estimate:

Estimated ERC = amount repaid × (ERC rate ÷ 100) × (days remaining ÷ charge-period days)

• Amount repaid (p) is the principal you intend to repay early, in dollars.
• ERC rate (fee) is the percentage stated for the relevant repayment, entered as a percent.
• Days remaining (days) is the estimated time left in the period when the charge can apply.
• Charge-period length (period) is the total length of that period, in days.

The second output, “Charge before time adjustment,” is the repayment amount multiplied by the stated percentage, without reducing it for elapsed time. The first output applies a straight-line reduction based on the fraction of the period remaining. That reduction is a modelling choice, not a universal ERC rule. Many contracts calculate the fee differently, so use the figure in your lender’s written disclosure for an exact payoff amount.

Worked Example

Using the calculator’s default values—$20,000 repaid, a 2% rate, 180 days remaining, and a 365-day charge period:

1. Convert the percentage to a decimal: 2 ÷ 100 = 0.02.
2. Calculate the unreduced charge: $20,000 × 0.02 = $400.
3. Find the remaining fraction: 180 ÷ 365 ≈ 0.4931507.
4. Apply that fraction: $400 × 0.4931507 ≈ $197.26.

Estimated early repayment charge: $197.26. This is the result rounded to cents. The output before time adjustment is $400.00.

Assumptions

• The entered rate is applied to the amount repaid, rather than to the full outstanding balance.
• The charge decreases in direct proportion to days remaining in the period.
• The period is measured in days, and the entered values are accurate enough for an estimate.
• No interest accrued to the payment date, administrative fees, taxes, discounts, caps, minimum charges, or other contract terms are included.

This is not a universal mortgage or loan payoff formula. If your agreement uses a different base, dated balance, annual schedule, tiered percentage, or a fixed fee, the calculator cannot reproduce that method without those details.

When to Use an ERC Estimate

A calculator can help you understand the rough scale of a possible charge before requesting a formal payoff quote. It may also help compare hypothetical amounts or dates using the terms you already have. An ERC is separate from the principal still owed and any interest due through the payoff date, so do not treat the estimate as the total amount needed to close an account.

For a meaningful estimate, locate the charge details in your agreement or a current statement. Confirm:

• Which balance or repayment amount the percentage applies to.
• The exact rate for the date and type of repayment.
• When the charge period starts and ends, including how the contract counts days.
• Whether a partial repayment is treated differently from full repayment.
• Any allowance, threshold, cap, minimum, or other adjustment specified in your contract.

Then ask the lender or servicer for a dated payoff statement if you need the amount to complete a transaction. The balance and charge can change as time passes or payments post.

How to Read the Result and Avoid Errors

The estimate rises when the amount repaid or charge rate rises. Under this calculator’s proportional assumption, it falls as the remaining fraction of the charge period gets smaller. A zero-day remainder produces a zero estimate; a full period remaining gives the unadjusted percentage charge.

Common errors include entering the full loan balance when the percentage applies only to the amount repaid, using a percentage as a decimal (enter 2 for 2%, not 0.02), and mixing up days remaining with the full charge-period length. Do not enter a period of zero: the formula divides by that input. The calculator accepts zero days remaining, but the total period must be at least one day.

Rounding can also create small differences. This page rounds the displayed money outputs to two decimal places, while a lender may calculate using exact dates, unrounded values, or a different day-count convention. A few cents of difference does not establish that either calculation is wrong; compare the underlying method and dates.

Contract Terms, Limits, and Alternatives

“Early repayment charge” is a contract term, not one fixed calculation shared by every loan. A stated percentage may apply to a specified balance or period, while another agreement may use a schedule or other defined method. The calculator has no access to your account, contract, payment history, or lender’s payoff system. Its result is only as suitable as the assumptions entered.

If the estimate does not match the contract’s method, do not force the inputs to produce a preferred figure. Request a breakdown showing the repayment amount used, rate, relevant dates, and any adjustments. If you are considering a smaller repayment or a different date, request figures for those exact scenarios as well. This explains the arithmetic without recommending whether or when to repay.

Frequently Asked Questions

How do I calculate an early repayment charge?
Use the method and figures in your loan agreement. This calculator estimates a charge by multiplying the early repayment amount by the percentage rate and the fraction of the charge period remaining. The lender’s method may differ.

Is an early repayment charge the same as the remaining loan balance?
No. An ERC is a separate charge that may apply under the contract. A full payoff figure can also include outstanding principal and interest or other amounts due, so the calculator’s charge is not a payoff quote.

Can I use this calculator for a partial repayment?
Yes, if the contract’s percentage applies to the partial amount entered. Check whether the agreement uses a different balance, allowance, threshold, or calculation for partial repayments.

Why is my lender’s figure different?
The contract may not reduce the percentage in direct proportion to days remaining. It may also use different dates, a different balance, a fixed or capped amount, or include items this estimate excludes. Ask for an itemized explanation.

Can I avoid an early repayment charge by waiting?
The charge may depend on the repayment date and the terms of the agreement, but this estimate cannot determine the effect of a particular date under your contract. Request dated figures from the lender or servicer.

This result is an estimate for education, and the lender’s disclosure gives the exact figures.

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in p | Amount repaid early | $ | 20000 | 0 | 100000000
in fee | ERC rate | % | 2 | 0 | 100
in days | Days remaining in charge period | days | 180 | 0 | 36500
in period | Charge period length | days | 365 | 1 | 36500
out charge | Estimated early repayment charge | $ | p * (fee / 100) * days / period | 2
out base | Charge before time adjustment | $ | p * (fee / 100) | 2