Past Due Invoice
An invoice that remains unpaid after its due date has passed, triggering reminders, late fees, or collection steps.
Definition
A past due invoice is any invoice the client hasn't paid by its due date. The moment that date passes without payment, the invoice's status flips from open to past due (you'll also see "overdue"), and it starts accumulating age—1 day past due, then 15, then 45. Nothing about the debt itself changes; what changes is what you're entitled and expected to do about it.
In practice, past due status kicks off an escalation sequence. A polite reminder in the first week, a firmer notice with a re-attached invoice at two or three weeks, late fees if your payment terms specify them, and eventually a phone call, a stop-work decision, or collections. Most invoicing software automates the reminder stages and can flag or re-label the invoice as "Past Due" so the client sees the status, not just you.
Why It Matters
Speed matters enormously here: the probability of collecting drops the longer an invoice sits past due, so a same-week reminder is worth far more than a stern letter in month three. Many late payments aren't defiance—they're a lost email or an approver on vacation—and a prompt, friendly nudge resolves the majority without awkwardness.
Past due invoices are also where your payment terms earn their keep. If your invoices state a late fee (say 1.5% per month) and a clear due date, you have standing to charge interest, pause work, or escalate. If they don't, you're negotiating from scratch every time. Track your past due percentage as a health metric: if more than 15-20% of your receivables are past due, fix your terms, deposits, or follow-up cadence before chasing any single invoice.
Examples
- 1
A $2,400 Net 30 invoice dated March 1 becomes past due on April 1; the freelancer's software auto-sends a reminder on April 3 and the client pays the same afternoon.
- 2
A consultant's contract allows a 1.5% monthly late fee, so a $5,000 invoice that is 60 days past due is re-issued at $5,151 with a note explaining the charges.
- 3
After an invoice hits 90 days past due, an agency pauses all work for the client and offers a payment plan: $1,000 down and three monthly installments of $800.
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