How to Follow Up on an Unpaid Invoice (Step-by-Step Guide)

Follow up on unpaid invoices professionally with proven templates and steps. Increase your chances of getting paid fast.

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Copy-ready example

Subject: Payment reminder — Invoice INV-001 (how to follow up unpaid invoice)

Hi {{ClientName}}, This is a reminder that invoice {{InvoiceNo}} for {{Amount}} was due on {{DueDate}}. Please confirm payment status and expected payment date. If payment has already been made, please disregard this message. Thanks, {{CompanyName}}

Best-practice checklist

Reference invoice number, amount, and due date in the first paragraph.
Keep wording factual and professional.
Set a clear next action and payment timeline.
Keep a copy of each reminder before escalation.

FAQ

Should I change tone by reminder stage?

Yes. Start polite on first contact, then increase urgency in second and final reminders.

Should I include legal language immediately?

Usually no. Keep early reminders simple, then add escalation language if non-payment continues.