Do not chase the wrong balance
Account for credits, part-payments and any agreed variation before quoting the amount due.
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Overdue invoice
Treat an overdue date as a prompt to verify and act.
Reconcile the current balance, confirm payment terms and check for a late transfer or customer query before chasing. A short factual reminder is often the appropriate first action.
Create a dated trail
Record when the reminder was sent, how it was delivered and any reply or promised date.