Formula
Daily rate = Annual rate ÷ 365. With daily compounding, interest = Principal × ((1 + daily rate)^overdue days − 1).
X-Facture Finance Engine
Late Fee & Overdue Interest Calculator
Calculate daily compounding interest penalties, grace period offsets, and 30/60/90-day aging recovery totals for overdue invoices.
Delinquency & Penalty Parameters
$
Unpaid balance on invoice due datedays
Elapsed time since payment deadline% APR
Standard rate: 10% to 24% per contract/lawdays
Penalty-exempt buffer window$
Fixed fee applied once grace period expiresCurrent Total Amount Due $5,137.03 Original Principal: $5,000.00
Total Accrued Penalty & Interest +$137.03 Billable Days: 35d (Daily: 0.0493%)
Statutory Late Fee Growth by Aging Bracket
Principal vs. Cumulative AccrualCompounded Daily Interest:+$87.03
Fixed Administrative Charge:+$50.00
Total Recovery Claim:$5,137.03
Calculator guide
Late Fee & Interest Calculator
Calculate late payment fees and interest on overdue invoices or balances.
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How it works
The calculator removes any grace period, applies the selected annual rate to the billable overdue days and adds a flat late fee when applicable. It also projects penalty amounts at 30, 60 and 90 days.
Assumptions & notes
- Late-fee and interest rules vary by contract and jurisdiction.
- Daily compounding is a modeling assumption and may not match the governing agreement.
- Use the result as an estimate and verify the applicable legal or contractual terms.