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For Finance Officers

Late Fee Calculator

Pick a penalty rule (flat, percent of due, per-day flat, or per-day percent), set grace days, and see the exact penalty and total payable, plus a 30/60/90-day unpaid forecast.

Four Penalty RulesGrace Days30/60/90 ForecastMulti-Currency

Inputs

Enter the unpaid amount, the dates, and pick a penalty rule.

$
Penalty type

A single fixed penalty applied once, regardless of how many days overdue.

$

Live result

Days overdue
Chargeable days (after grace)
Penalty

Total payable

Enter a due date and a paid date to compute.

If unpaid for…

DaysPenaltyTotal
30$50.00$1,050.00
60$50.00$1,050.00
90$50.00$1,050.00

Forecast uses the same penalty rule, grace days, and amount due. For one-time penalty rules (flat, % of due), the result does not grow with time.

How it works

The calculator first computes days overdue as the gap between the due date and the paid date (or today). It then subtracts the grace period to get chargeable days. The penalty rule you pick decides the formula: flat and percent-of-due are one-time amounts (they do not grow with time), while per-day flat and per-day percent multiply by chargeable days.

The result panel shows the penalty, the total payable (amount due plus penalty), and a forecast of what the bill would look like at 30, 60, and 90 days unpaid. Use the forecast to decide on cap policies or to write a parent reminder that quantifies the cost of delay.

All calculations happen in your browser. Nothing is saved, sent, or logged. To automate the same math across thousands of fee invoices (with reminder SMS, parent portal display, and ledger posting), see the Fees Management module or browse other free planning tools on the tools hub.

Frequently asked questions

School late fees are calculated using one of four common rules: a flat penalty (a single fixed amount, charged once), a percentage of the unpaid amount (also one-time), a per-day flat amount (the same currency value for every day overdue), or a per-day percentage (a small percentage of the amount due, multiplied by the days overdue). Most institutions also apply a grace period (typically 3 to 7 days) before the penalty clock starts. So if a fee is 5 days overdue with a 3-day grace, the chargeable period is only 2 days. The exact rule is set in your fee policy and disclosed in the admission letter.

Automate fee penalties for every student

OpenEduCat's Fees Management module applies your late fee policy automatically across every invoice, sends reminders before and after the due date, and posts the penalty to the student ledger without manual data entry.