Demand letter — unpaid invoice
Drafts a first demand letter for an unpaid commercial invoice or account balance. Reach for it when a client wants payment without filing suit yet.
## Context
You are drafting correspondence for [ATTORNEY NAME], a [JURISDICTION] attorney representing [CLIENT NAME], a [CLIENT BUSINESS TYPE]. The debtor, [DEBTOR NAME], owes [AMOUNT OWED] on invoice(s) [INVOICE NUMBERS] for [GOODS OR SERVICES PROVIDED], due [DUE DATE]. Prior collection attempts: [PRIOR ATTEMPTS]. Governing terms: [CONTRACT OR INVOICE TERMS, INCLUDING INTEREST AND FEE PROVISIONS].
## Task
Draft a demand letter to the debtor seeking full payment within [DEADLINE]. The letter must:
- Identify the debt: amounts, invoice numbers, dates, and what was provided.
- State the contractual basis for the obligation.
- Demand a specific sum by a specific date, with a payment-instructions placeholder.
- Add interest or fees only if the terms above support them, and show the calculation.
- State the consequence of nonpayment in one sentence — suit, without bluster.
- Reserve all rights and remedies.
## Standards
One page, business letter format with letterhead, date, recipient, and re-line placeholders. Firm and professional. No threats beyond stating available civil remedies. No rhetorical questions, no all-caps, no characterization of the debtor's conduct as fraudulent or criminal. Do not cite statutes or case law; where a statutory citation may belong, insert [VERIFY: describe what to check]. If the debt could be consumer debt rather than commercial, stop and say so — FDCPA and state collection statutes change the rules. If any required fact is missing or unclear, ask before drafting. - Invoice copies with numbers, amounts, and due dates.
- The contract or credit terms that set interest, late fees, or attorney-fee recovery.
- Dates and substance of prior payment demands.
- Confirmation the debt is commercial, not consumer — FDCPA and state collection statutes change what you can say.
- Remove client-identifying details, or confirm your AI tool sits under your firm's confidentiality and bar guidance before pasting client data.
- Every dollar figure matches the invoices. Re-run the math yourself, including interest.
- Interest and fee demands trace to a contract clause or a statute you verified in the official code — never demand what the terms do not give you.
- The payment deadline is a real business day and satisfies any notice period the contract requires.
- No language that could read as a threat of criminal referral — check your state's rule against threatening prosecution to gain advantage in a civil matter.
- If the debtor is an individual, confirm FDCPA and your state collection-practices act do not apply before sending.
- All placeholders — letterhead, recipient address, payment instructions, re-line — are replaced.
- The letter does not waive or undercut acceleration, default, or fee-shifting rights in the underlying contract.
Sample output
Sample output — AI-generated from sample inputs:
Re: Demand for Payment — Meridian Supply Co. Invoice No. 2417
Dear Mr. Okafor:
This firm represents Meridian Supply Co. I write about the unpaid balance on Invoice No. 2417.
On February 3, 2026, Meridian delivered 60 pallets of commercial roofing membrane to Brightline Contractors LLC under the credit agreement dated January 12, 2026. Invoice No. 2417, in the amount of $18,450.00, was due March 5, 2026. Despite Meridian's written reminders of March 20 and April 14, no payment has been received.
Under Section 6 of the credit agreement, past-due balances accrue interest at 1.5% per month. As of June 10, 2026, the balance is $19,280.25, inclusive of accrued interest. [VERIFY: confirm interest calculation against Section 6 before sending.]
Demand is made for payment of $19,280.25 on or before June 24, 2026. Payment may be made by [PAYMENT INSTRUCTIONS].
If payment is not received by that date, Meridian has authorized this firm to pursue all available remedies, including suit for the balance, accruing interest, and attorney fees under Section 9 of the agreement.
This letter is not a complete statement of Meridian's rights, all of which are expressly reserved.
Sincerely,
Dana Whitfield For consumer debtors this prompt is not enough — add FDCPA validation language and check your state act before adapting it. Adjust the payment window to local custom; 10 to 30 days is typical. Add a personal-guaranty paragraph when a principal signed one. Collection-heavy practices can save the filled Context block as a reusable template per client.