What is a demand letter for payment?
A demand letter (or letter of demand / letter before action) is a formal written request for an overdue payment. It states what is owed and why, gives a final deadline, and explains what will happen if the money is not paid. It is usually the last step before a collection agency or a small claims court – and in many places courts expect you to have sent one before you file a claim.
When to send one
Most unpaid invoices are solved with friendly reminders – use the payment reminder email generator first. Send a demand letter when:
- the invoice is 30–60+ days overdue and reminders have been ignored,
- the client has promised to pay and has not, or
- you intend to use collections or court if the money does not arrive.
What a demand letter should include
- Your details and the debtor's details, and the date
- A clear subject line: "Formal demand for payment – invoice number – amount"
- The amount owed, the invoice numbers and original due dates
- A short history: the work done and the reminders already sent
- Any late fees or interest only if they were in your agreed terms – calculate them with the late fee calculator
- A specific deadline – usually 7 to 14 days
- The next step you will take if unpaid
- An offer to discuss a payment plan, and how to pay
Tips
- Stay factual and calm. The letter may be read by a judge one day.
- Only threaten what you will do. If you will not go to court for a small amount, say you will use a collection agency instead.
- Send it in a way you can prove – email plus tracked or certified post.
- Attach the invoice and a statement of account if several invoices are unpaid.
- Prevent the next one with a deposit and clear terms in your contract.
General information, not legal advice. Debt collection and court procedures differ by country and state; consider advice from a lawyer for large amounts.
Frequently asked questions
Is a demand letter legally required before suing?
Not everywhere, but many courts expect you to have made a clear written demand and given a reasonable chance to pay, and some require it for small claims. It also often gets the invoice paid without court.
How long should I give the client to pay?
7 to 14 days is typical. Give a specific calendar date rather than 'within 7 days' so there is no doubt.
Can I add interest or late fees?
Only if they were part of your agreed terms or are allowed by law in your country (for example statutory late payment interest for business debts in the UK and EU). Do not invent new charges in the demand letter.
Should the letter come from a lawyer?
A letter from you is fine for most small business debts. A lawyer's letter can add weight for larger amounts or difficult clients.
