Demand Letter for Unpaid Invoice

Template

[Your Name / Business]
[Your Address]
[Email] | [Phone]
[Date]

[Client Name]
[Client Address]

Re: Overdue Invoice [Invoice #] for [Amount Due]

Dear [Client Name],

Our records show invoice [Invoice #], dated [Invoice Date], for [Amount Due] remains unpaid past its [Due Date] due date. A copy is enclosed for your reference.

Please remit the full [Amount Due] within [Number] days of this letter. If payment is not received by [Final Date], we will pursue all available remedies, which may include [collection action / small claims court], without further notice.

We value our working relationship and prefer to resolve this promptly. You may pay by [payment method] or contact me to arrange a plan.

Sincerely,
[Your Name]

What to fill in

Your legal name or business
The client’s correct legal name and address
Exact invoice number, date, and amount
A clear deadline (7–14 days is common)

Legal note

Keep proof of delivery (certified mail or email read receipt). In the US, a written demand is often required before filing in small claims court. Interest or late fees apply only if your contract or local law allows them.

Templates reviewed by the DemandKit editorial team; not a law firm — see disclaimer.

Demand Letter for Unpaid Invoice

What to fill in

Legal note

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