The best follow-up is short, specific, and includes the payment link again so the customer does not have to search for it.
Subject: Reminder — invoice [number] is due [date]. Hi [name], a quick reminder that invoice [number] for [amount] is due on [date]. You can review and pay it here: [invoice link]. Please let me know if you need anything from me.
Subject: Invoice [number] is now overdue. Hi [name], invoice [number] for [amount] was due on [date] and is still showing as unpaid. Please use this link to complete payment: [invoice link]. If payment has already been sent, or something is blocking approval, please let me know.
Keep the invoice number, amount, due date, and payment link in every message. On paid plans, Cosmobill can send automatic overdue reminders so you do not need to maintain a separate reminder spreadsheet.
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