Demand Letter · Unpaid invoice
For a customer who has not paid an invoice.
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Written to be usable as it stands. If the amount at stake is large or the other side has lawyers, a reviewed and jurisdiction-specific version is worth the fee.
Dear Sir / Madam,
Our records show that $ [amount] remains outstanding on [reference], which fell due on [date]. Earlier reminders have not been answered.
This letter is a formal demand for payment of that sum in full within [number] days of the date above.
If payment is not received in that time we will consider recovery of the debt, which may include interest and costs, and may affect any further supply on credit. If you believe this amount is not owed, or you would like to agree a payment plan, contact us before the deadline and we will discuss it.
What is a Demand Letter?
A demand letter is a formal, dated request for payment or performance, sent before you escalate. It matters because it converts an ongoing chase into a documented position: a stated amount, a stated basis, a stated deadline and a stated consequence. Courts, tribunals and mediators expect to see one, and it often works on its own — people pay when a reasonable request stops looking like another reminder and starts looking like the last one.
Businesses send them for unpaid invoices. Landlords send them for rent arrears and damage. Individuals send them to contractors who took a deposit and vanished, to insurers who have gone quiet, and to former employers over unpaid final pay. Demand letters are also sent for performance rather than money — finish the work, return the equipment, take down the material. It is normally the last step before a formal claim, a debt recovery agent, an ombudsman or a small claims filing, and it is frequently written by the claimant rather than by a lawyer.
How much weight the letter carries depends on where you are. England and Wales expect parties to follow pre-action protocols before issuing a claim, and ignoring them can affect costs. Several US states require specific notice before certain claims, and consumer debt rules restrict how a demand may be worded and who may send it. In India a legal notice served through an advocate is the customary step before civil proceedings. Limitation periods matter everywhere. Check the pre-action requirements and the limitation period for your jurisdiction and claim type, and take advice before threatening any specific legal step.
A demand letter is not a court order and creates no obligation that did not already exist. It does not stop a limitation period running — normally only starting proceedings does that. It is not the place to threaten anything you are not entitled to do: threatening criminal complaints, publicity, or contact with someone's employer or customers to recover a civil debt is improper in several jurisdictions and can be unlawful. And it does not decide the dispute, because the other side may answer with a counterclaim you then have to deal with.
What to put in a Demand Letter
These are the details this template asks for. Anything left blank is marked in red on the preview so you can see what is still missing.
| Field | What goes in it |
|---|---|
| Business name | For example: Barton Supply Co. |
| Your address | For example: Unit 7, Barton Road, Columbus, OH 43212 |
| Invoice / matter reference | For example: INV-4471 |
| Amount owed | For example: 2,400.00 |
| Due since | Free text |
| Days to pay | For example: 14 |
| Issued to (full name) | For example: James Whitfield |
| Their address | For example: 588 Kinnear Road, Columbus, OH 43212 |
How to write a Demand Letter
Set out the obligation and its source
Start with where the debt comes from: the contract and its date, the invoice number and date, the purchase order, or the agreement recorded in an email chain. Attach copies. The reader should be able to see why the money is owed without asking you for anything. A demand that opens with an amount and never explains the basis reads as a dispute; one that opens with the document reads as a record.
State one figure and show its build-up
Give the principal sum, then any interest and recovery costs separately, with the clause or statutory basis you rely on and the calculation. Show payments already received and their dates. One clear total at the bottom. If you cannot reconcile your own figure, the recipient will use that as the reason to pay nothing at all, and a tribunal will ask exactly the question you failed to answer.
Give a firm, reasonable deadline
Name a date rather than a number of days, and make it realistic — long enough to get an approval through a finance team, short enough to function as a deadline. Say what you will do if it passes: refer the matter for recovery, issue a claim, or instruct advisers. Say only what you actually intend to do and are entitled to do, because the letter may be read back to you.
Make it easy to pay you
Include full payment details — account name, account number and sort code or IBAN, the reference to quote, and any online payment link. Offer an instalment discussion if you would accept one, and name a person to contact. A surprising share of unpaid invoices are unpaid because a payment reference stopped matching after a system change, and the demand letter is where that finally gets fixed.
Send it traceably and keep the file
Send it by email and by post to the registered office or the contractual address for service, using a service that gives proof of delivery. Keep the letter, the enclosures, the proof of posting and every reply together — this bundle is what an adviser, an ombudsman or a court will ask for first. Keep the tone level, because it will be read by people who were not part of the argument.
Common mistakes
- Threatening criminal proceedings, publicity or contact with the debtor's customers to recover a civil debt, which is improper in several jurisdictions and can hand the other side a complaint against you.
- Claiming interest without naming the contractual clause or statutory basis and showing the calculation, so the whole figure looks invented and the principal gets disputed alongside it.
- Sending the letter to a trading address rather than the registered office or the contractual address for service, so receipt is later denied and the deadline means nothing.
- Setting a forty-eight hour deadline no finance department could meet, which makes the demand look unreasonable if it is ever read by a judge or an ombudsman.
- Writing at length about the relationship rather than the debt, handing the recipient a document they can use to characterise the claim as a personal grievance.
Frequently asked questions
Does a demand letter have to come from a lawyer?
No. A clear letter from you, with the contract and invoices attached, does the same job in most straightforward debts. A letter on a firm's paper signals cost and intent, which sometimes moves a reluctant payer, and in India a legal notice through an advocate is the customary step before civil proceedings. Take advice where the sum is large or liability is genuinely contested.
How long should I give someone to pay?
Long enough to be reasonable and short enough to be a deadline — for a business debt, a stated date roughly two weeks ahead is common practice. Where a pre-action protocol applies it may set expectations for response times, so check the one for your jurisdiction and claim type before choosing. Always give a calendar date rather than a vague period.
What happens if the demand letter is ignored?
Then you decide whether to escalate: a small claims or civil filing, an ombudsman or tribunal, a debt recovery agent, or writing the debt off. The letter itself is not enforceable. Before filing anything, check the limitation period for the claim and the pre-action steps expected where you are, and get advice if the amount justifies the cost.
Should I send a demand letter by registered post?
Send it by a method that proves delivery, and send an email copy as well. Recorded or registered post to the registered office or the contractual address for service is the safest combination, because the most common answer to a demand is that it was never received. Keep the receipt filed with the letter and its enclosures.
Is a demand letter the same as a legal notice?
In everyday use they overlap. Legal notice is the standard term in India for a formal notice, usually issued through an advocate, that often precedes civil proceedings. Demand letter is the common term in the US, UK, Canada and Australia for a pre-action request for payment. The content is much the same: the obligation, the amount, the deadline and the consequence.
This page explains general practice and is not legal advice. Requirements differ between countries and, in some cases, between states — check what applies where the document will be used.