Invoicing & Collections
Invoice Late Fee & Overdue Interest Calculator
Calculate late interest on overdue invoices and generate a clean, professional payment demand letter.
Standard Commercial Terms (1.5%/mo) Statutory Compliant
Invoice Late Fee & Overdue Interest Calculator
Calculate late payment penalties, accrued statutory interest, and generate a ready-to-send payment demand notice.
1. Invoice Details
$
2. Late Fee Structure
Total Balance Now Due
$4563.00
+$63.00 Penalty
28 billable overdue days
Original Invoice Principal$4,500
Late Payment Interest / Penalty+$63.00
Daily Accrual Rate$2.25 / day
Ready-to-Send Overdue Notice
Subject: Overdue Notice: Updated Balance Due on Invoice (Payment Required)
Hi [Client Name],
I am writing to follow up on Invoice #[Invoice Number] in the original amount of $4,500, which was due on [Due Date] and is currently 35 days past due.
Per our contract terms, a late payment interest fee of 1.5% has been assessed for the 28 days overdue beyond our 7-day grace period.
Updated Balance Summary:
- Original Invoice Balance: $4,500
- Accrued Late Penalty: $63.00
- Total Balance Due Immediately: $4563.00
Please remit payment today via [Payment Method / Stripe Link / Bank Details] to bring this account up to date.
Thank you,
[Your Name / Business Name]
Legal Enforcement Tip
To legally enforce late fees, the payment terms (e.g. "1.5% interest per month on balances past 30 days") must be explicitly stated on your original contract and invoice.
Frequently Asked Questions
The standard commercial late fee is 1.5% per month (which equals 18% annual APR).
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