An invoice is overdue. You have followed up, sent reminders and perhaps spoken to the customer, but payment still has not arrived. At this point, a letter of demand can be a useful next step.
A good letter of demand does more than say “pay me”. It clearly explains what is owed, why it is owed, when payment is required and what you genuinely intend to do if the matter remains unresolved.
The difficult part is getting the tone and substance right. A demand that is vague, inaccurate or unnecessarily aggressive can make a commercial dispute harder to resolve.
When Should You Send a Letter of Demand?
A letter of demand is usually appropriate after ordinary attempts to resolve an unpaid debt or contractual dispute have failed. For an overdue invoice, that will often mean checking the contract and invoice first, then sending one or more reminders before escalating the matter. The Australian Government’s business guidance recommends trying reminder communications before sending a formal demand.
Not every late payment needs an immediate legal letter. Sometimes an invoice has been overlooked, sent to the wrong person or caught in an accounts process. If preserving the customer relationship matters, a telephone call or reminder may solve the problem without escalating it.
A demand becomes more useful when the other party has stopped engaging, disputes responsibility without properly explaining why, repeatedly promises payment without following through, or simply ignores your attempts to resolve the matter.
1. Make Sure You Are Demanding Payment From the Right Party
Before drafting the letter, identify exactly who owes the debt.
This can become surprisingly important where you have dealt with a trading name, company representative, related company or individual but the contract was actually entered into with another legal entity.
Check the contract, quote, purchase order, invoice and relevant correspondence. If the debtor is a company, make sure the company named in the demand is the entity that incurred the obligation.
A strongly worded demand addressed to the wrong party does not strengthen your position.
2. Explain Why the Money Is Owed
The recipient should be able to read the letter and understand the basis of the claim without having to reconstruct months of emails.
Usually, that means identifying:
- the relevant agreement, invoice or transaction
- the goods or services supplied
- the amount outstanding
- when payment became due
- relevant previous requests for payment.
Accuracy matters more than dramatic language. Government guidance specifically recommends checking that the information in a demand is precise and not false or misleading.
If there is a genuine dispute about whether the amount is payable, a letter of demand should deal with that issue rather than simply repeat that payment is overdue.
3. Say Exactly What You Want
A demand should make the required next step obvious.
For a debt, state the amount you say is outstanding and the date by which you require payment. If you are demanding some other contractual action, explain precisely what needs to happen.
Be careful with interest and additional fees. Do not simply add late fees, collection costs or interest because they seem reasonable. Check whether there is a contractual or legal basis for claiming them.
The deadline should also be realistic. There is no universally correct number of days for every letter of demand. The appropriate period depends on factors such as the agreement, amount involved, previous correspondence, urgency and type of dispute.
4. Do Not Threaten Action You Are Not Prepared to Take
It is common for a demand to say that legal proceedings may be commenced if the matter is not resolved. That can be appropriate where litigation is genuinely being considered.
What should be avoided is a long list of threats designed purely to intimidate the recipient.
A useful rule is simple: only mention consequences you are legally entitled and genuinely prepared to pursue. Australian Government guidance similarly cautions against mentioning action that you are not willing to take.
The objective is not to write the angriest letter possible. It is to make the recipient understand that the matter is serious and give them a clear opportunity to resolve it.
5. Support the Demand With Evidence
Where appropriate, attach the documents that make the claim easy to verify. These might include the contract, unpaid invoices, purchase orders or previous correspondence.
Keep the originals and maintain a complete copy of the demand and attachments for your records. A letter of demand can later provide evidence that you asked the other party to pay before commencing proceedings.
Also keep a record of when and how the demand was delivered. Depending on the circumstances, it may be sent by email, post or another reliable method.
Proof that the letter was actually sent can become important later.
What Should a Letter of Demand Actually Say?
For a straightforward unpaid debt, the letter will usually need to cover:
- Who the parties are: identify the creditor and debtor correctly.
- Why the debt exists: refer to the contract, invoice or transaction.
- What is outstanding: provide the amount and relevant due date.
- What must happen now: state how and when payment should be made.
- What happens next: explain the action you may consider if payment is not received.
That sounds simple, but disputes often arise around the details rather than the format. A template can tell you where to put the amount owed. It cannot necessarily tell you whether you have correctly identified the debtor, whether interest can be claimed or whether the other party has a legitimate contractual defence.
What Happens After You Send It?
A demand does not guarantee payment.
The recipient may pay in full, dispute the debt, ask for supporting documents, propose instalments, make a settlement offer or ignore the letter altogether. Those are all common responses.
If the debtor proposes a commercially sensible payment arrangement, accepting it may be better than immediately starting proceedings. Debt recovery is ultimately a commercial exercise: obtaining a judgment is not necessarily the same thing as recovering the money.
If there is no satisfactory response, the next step might involve negotiation, mediation, formal debt recovery proceedings or another legal process depending on the nature and size of the claim.
Read our Australian guide to debt recovery for more information about the available options.
A Letter of Demand Is Not the Same as a Statutory Demand
These terms are sometimes confused.
- An ordinary letter of demand is correspondence asking another party to satisfy a legal obligation and commonly warning that further action may follow.
- A statutory demand is a specific insolvency process available in relation to debts owed by companies and carries very different legal consequences and requirements.
Do not use the expressions interchangeably. If you are considering formal insolvency action against a company, read our guide on statutory demands.
Common Letter of Demand Mistakes
In practice, the problem is often not that someone forgot to write “Letter of Demand” at the top. The more significant mistakes tend to be substantive: demanding money from the wrong entity, overstating the amount owed, claiming interest without checking the contractual basis, using an unrealistic deadline or threatening proceedings that the sender has no intention of commencing.
Another common mistake is treating a disputed debt as though it were simply an unpaid invoice. If the recipient has raised a genuine issue about performance, defects, scope of work or contractual obligations, that dispute may need to be addressed directly.
A letter is more persuasive when the person receiving it can see that the sender understands the underlying contract and has properly considered the claim.
Before Sending a Letter of Demand
Before pressing send, ask yourself three questions:
- Can I prove the debt?
- Am I demanding the correct amount from the correct legal party?
- Am I genuinely prepared to take the next step described in the letter?
If the answer to any of those questions is unclear, it may be worth resolving that issue before making a formal demand.
Prosper Law assists Australian businesses with contractual disputes, unpaid debts and letters of demand. If an unpaid account has moved beyond routine reminders or there is a dispute about what is actually owed, our contract lawyers can advise on the appropriate next step.
Frequently Asked Questions
Is a letter of demand legally binding?
A letter of demand is generally a formal request for another party to satisfy an obligation. It is not, by itself, a court order requiring payment.
Its value is that it clearly records your position, gives the other party an opportunity to resolve the matter and may be relevant evidence if proceedings are later commenced.
Can I write a letter of demand myself?
Yes. For a straightforward undisputed invoice, a business may be able to prepare its own demand.
Legal assistance becomes more useful where the amount is significant, the debt is disputed, the contractual position is unclear, you are claiming additional losses or interest, or you intend to commence proceedings if the demand fails.
Can I charge interest on an unpaid debt?
Possibly, but do not automatically add interest to a letter of demand. Check the contract and the applicable law to determine whether you have a proper basis for claiming it.
How long should I give someone to respond?
There is no single deadline that suits every dispute. The period should be reasonable in the circumstances and may depend on the contract, previous correspondence, amount claimed and urgency of the matter.
What if the debtor ignores the letter?
You then need to decide whether further recovery action is commercially worthwhile. That may involve negotiation, dispute resolution or court proceedings.
Consider the amount involved, strength of the claim, likely legal costs and whether the debtor is realistically able to pay before escalating the dispute.
Updated: August 2026
About the Author
Farrah Motley
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