Letters of Demand

What is a letter of demand?

A letter of demand is a formal written notice from a creditor to a debtor, stating that a debt is owed, the amount, and demanding payment by a specified date. It is the last step before formal recovery action — whether through a collection agency or the courts.

Letters of demand serve multiple purposes:

• They create a clear, timestamped record that you claimed the debt and the debtor had notice of it
• They often prompt payment from debtors who did not respond to earlier, less formal contact
• They are required (or strongly expected) by courts before most legal actions — demonstrating that you gave the debtor a fair opportunity to pay
• If the debtor is a company heading toward insolvency, a letter of demand can support a winding-up application

When to send one

A letter of demand is appropriate when:

• The invoice is at least 30 days overdue and your follow-up cadence (emails and phone calls) has not produced payment or a credible payment commitment
• A payment commitment was made and broken more than once
• The debtor has stopped communicating
• The debtor is disputing the debt in a way you believe is not genuine

Sending a letter of demand at 30–45 days overdue is not premature. In fact, many creditors wait too long — by which point the debtor has accumulated debt with multiple creditors and the recovery position is worse for everyone. The longer you wait, the more you signal that your follow-up process has no real consequence.

Essential elements of a letter of demand

Every letter of demand should include:

Your full legal name and contact details

The creditor must be clearly identified. Include your address, email, and phone number.

The debtor's full legal name and address

If the debtor is a company, use its full registered name and address (from ASIC). This matters if you later need to serve legal documents.

The date of the letter

Use the actual date of issue. Do not backdate.

A clear description of the debt

Invoice number(s), invoice date(s), and what was supplied. Attach copies of the invoices. "The following invoices remain unpaid: Invoice #1042 dated 1 June 2026 for $4,800 and Invoice #1055 dated 15 June 2026 for $2,200."

The total amount owing

State the principal amount and, if your terms provide for it, any interest accrued and any costs you are entitled to recover.

A clear deadline for payment

Seven days is the standard commercial letter of demand deadline. Some solicitors use 14 days. The deadline should be a specific date, not "within seven days."

The consequence of non-payment

State clearly what you will do if payment is not received by the deadline. For example: "If payment is not received by [date], we will refer this matter to a commercial debt recovery agency / commence legal proceedings without further notice." Do not threaten action you do not intend to take.

Your signature

Sign the letter personally if you are the business owner or director. The letter carries more weight when it comes from a named individual rather than an anonymous "Accounts Receivable Team."

How to send it

Send the letter by email AND by post (ordinary mail is sufficient; registered mail is more formal and creates a delivery record). If the debtor has a solicitor, copy the solicitor.

Email creates an immediate, timestamped delivery record. Post creates evidence of a hard-copy demand — relevant if the email is disputed. Sending both removes the debtor's ability to claim they never received it.

DIY vs solicitor's letter

A letter of demand written by you, the creditor, is legally valid and costs nothing. However, a letter written by a solicitor or sent by a commercial collection agency on their letterhead often produces faster results — because it signals that you have already engaged professional assistance and are serious about recovery.

For straightforward commercial debts, a well-drafted DIY letter is entirely appropriate as a first formal step. If the DIY letter does not produce payment within the specified deadline, the next step is professional assistance — covered in Lesson 6.

The Merion letter of demand guide and template provides a complete, customisable template for commercial use. The invoice tools at invoices.merion.com.au also include a formal demand template as part of the reminder sequence.

Common mistakes to avoid

• Threatening legal action you won't take — empty threats erode credibility. Only threaten what you will follow through on.
• Using aggressive or personal language — "You are a dishonest person" is not appropriate in a letter of demand. Stick to facts and consequences.
• Setting an unrealistically short deadline — a 24-hour demand is likely to be challenged and is not the norm for commercial debts.
• Failing to attach the invoices — always attach copies. A debtor who claims not to have the invoice cannot use that as a defence if you attach them.
• Sending it too late — a letter of demand at 180 days overdue is less useful than one at 45 days. Don't wait.

Related tools and resources

• Letter of demand guide and template — Merion's complete resource for creditors
• Invoice reminder sequence templates — from first nudge to formal demand
• What makes a letter of demand effective — Merion newsroom