Free unpaid-invoice demand letter template

Copy the demand letter

Use only accurate facts. The requested response/payment date is your proposed date, not a nationwide legal deadline. Check any required notice period before choosing it.

[Your name and business name]
[Your mailing address]
[Your email and phone]
[Date]

To: [Client's legal name or business name]
[Client's mailing address or billing email]

Subject: Demand for payment — invoice [invoice number]

Dear [client name],

I am writing about invoice [invoice number], issued on [invoice date] for [description of the agreed work, goods or services]. Under our agreement dated [agreement date or description], payment was due on [original payment due date].

The original invoice amount was $[invoice amount]. After payments of $[payments received] and credits of $[agreed credits], the outstanding balance is $[remaining balance].

[Briefly describe the work delivered and any previous payment requests, with accurate dates. Delete this instruction and any statement you cannot support.]

Please pay the outstanding balance of $[remaining balance] by [requested response/payment date] using [payment method and instructions]. If you have already paid, please send the payment date and reference so I can reconcile the account.

If you dispute any part of this balance, please reply in writing with the specific items and reasons, together with relevant records. If you cannot pay in full, please contact me to discuss whether a written payment arrangement is possible.

I have included [invoice copy and relevant supporting documents]. Please respond to [your email or mailing address].

If we cannot resolve this, I will consider the available options, which may include seeking legal advice. I would prefer to resolve this directly.

Sincerely,
[Your name]
[Your title, if applicable]
[Business name]

How to adapt the letter before sending

1. Confirm who owes the invoice. Use the contracting person or business’s correct legal name and billing contact. Check the agreement, invoice, delivery records and any replies.
2. Reconcile the balance. Subtract all payments and agreed credits. For example, a fictional $1,000 invoice less a $250 payment and $50 credit leaves $700. Do not add interest, late fees or legal costs unless you have confirmed they are permitted by your agreement and applicable law.
3. Replace every bracketed placeholder. Include the original due date separately from your requested response date. Remove unsupported statements and attach only relevant records, without unrelated confidential information.
4. Check the rules that apply to your situation. Your contract or local rules may specify wording, timing, recipient or delivery method. Consumer debts, construction notices and lien rights can involve different requirements; do not assume this business-invoice template covers them.

Send it carefully and keep a record

Follow any applicable notice and delivery requirements rather than assuming email is sufficient. Keep a dated copy of the final letter, attachments, recipient details, delivery records and replies. A delivery receipt alone does not establish that every legal notice requirement was met.

Keep communication factual and private. Do not threaten arrest, public exposure or legal action you do not intend or cannot lawfully take. If the client disputes the invoice, review their specific concerns before escalating. Record any payment arrangement in writing.

If you learn of bankruptcy, receive a request to stop contact, face an approaching filing deadline or are unsure about your rights, pause and seek qualified legal advice. Sending a demand letter does not necessarily extend or preserve a deadline to sue.

Common questions

How long should I give the client to respond?

There is no single response period for all US unpaid invoices. Check your agreement and current state and court requirements. Do not treat an example date or your chosen date as a statutory deadline.

Does this letter guarantee I can sue or recover the money?

No. Your evidence, contract, applicable rules, filing deadlines and the client’s ability to pay all matter. A letter is a way to state your position and request a response, not a judgment or a promise of recovery.

Where can I check notice requirements?

Start with your own court’s official self-help guidance. For a state-specific example, California Courts explains asking for payment before small claims. California guidance is not a nationwide rule.