Unpaid Invoice Reminder Email With Strict Deadline

Need to draw a line? Use this firm template to set a non-negotiable deadline for payment or an exact pay date.

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One-time payment for a basic reminder pack.

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Full multi-email sequence plus templates and variations.

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When to use / when to send

Checklist / what to include

Invoice #{{InvoiceNumber}} and {{Amount}}
Due date {{DueDate}}
One hard payment deadline for response
Pay link {{PayLink}}
Statement that further action follows if missed

How to use

Copy/paste template

Hi {{Name}},

Invoice #{{InvoiceNumber}} for {{Amount}} remains unpaid, with due date {{DueDate}}. 

Please complete payment by {{StrictDeadline}} via {{PayLink}} or reply with the exact payment date. If we don’t have payment or a confirmed date by {{StrictDeadline}}, we’ll move to the next steps.

Thanks,
{{YourName}}
{{Company}}

Follow-up plan + common mistakes

If deadline missed, escalate immediately—do not send extra reminders.
If they reply with a partial update, request the full exact date.
Don’t negotiate deadlines unless your process calls for it.
Don’t set deadlines you can’t keep.
Don’t rely only on email—consider phone or escalation after this step.

FAQ

Follow through on your stated next steps—escalate, pause work, or initiate collections depending on policy.