LatePay Tools

Multi-Invoice Interest Calculator (Ireland)

Calculate late payment interest across multiple invoices with bulk processing support.

Format: CSV with header row (amount,dueDate,paidDate) or data only. Supports comma, space, or tab separators. Dates in YYYY-MM-DD format.

How it works

  • Paste CSV data with columns: amount, dueDate, paidDate (one invoice per row).
  • The calculator processes each invoice using the Ireland statutory rate of 10.15% per annum.
  • Calculates days late, interest owed, and total for each invoice.
  • Provides a summary with totals and a downloadable CSV with all calculations.

CSV Format Example:

amount,dueDate,paidDate
1000,2025-01-01,2025-01-15
2000,2025-01-05,2025-01-20

Example

Example: Processing 3 invoices with different due dates and payment dates.

Input:

amount,dueDate,paidDate
1000,2025-01-01,2025-01-15
2000,2025-01-05,2025-01-20

Output:

Total Invoice Amount: €3,000.00

Total Interest Owed: €X.XX

Total Amount Owed: €X,XXX.XX

Frequently Asked Questions

What CSV format should I use?

You can use a header row (amount,dueDate,paidDate) or paste data directly. Supports comma, space, or tab separators. Dates should be in YYYY-MM-DD format. Each row represents one invoice.

Can I process hundreds of invoices?

Yes, the calculator can process large batches. For very large datasets (1000+ invoices), consider processing in smaller batches for better performance.

This calculator uses the Ireland statutory late payment interest rate of 10.15% (effective from 1 July 2025). Results are for informational purposes only. Always verify calculations for legal or financial purposes.

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