Past due is a status, not a judgment. Most past-due invoices are lapses (lost, queued, waiting on a PO), not refusals. The days-past-due count drives the aging report and, in a good process, the follow-up stage: friendly at day 1, firm by day 21, escalated by day 45.
Glossary
Past due
Also: overdue · delinquent
An invoice is past due (or overdue) once its due date has passed without full payment.
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