Invoice cover notes and customer follow-up messages

The invoice itself should come from your accounting software, not a chat tool. It holds the amounts, the dates and the tax. What an AI tool can do is write the short email that travels with it, and the polite nudge three weeks later.

That's a small job, and a useful one. Many owners put off chasing money because the wording feels awkward.

What the tool should never touch

A chat tool can get a figure wrong without any sign it has done so. Chat tools can slip in false details that read as fact¹. On a cover note, that could be an amount, a due date or a bank detail that doesn't match the invoice.

So the rule is firm. Copy the amount, invoice number, due date and payment details into the note yourself, from the invoice. Or leave them out of the note and say "see attached". Then read the finished email against the invoice, figure by figure.

Tax questions are for the tax authority or an accountant. In Australia, the ATO's page on tax invoices sets out what an invoice must include. Among its listed details are the seller's identity and the "Seller's Australian business number (ABN)"². Rules differ in other countries, so look at your own tax body's page. Don't ask a chat tool whether your invoice is valid.

Emailing an invoice

The ATO says you can issue a tax invoice by emailing it as a PDF or in another digital format². It also says that any digital record sent to the customer needs to contain all the required information to be a valid tax invoice². This is Australian GST guidance, checked on 2026-11-11. So the attachment must be complete. A cover note can't make up for a missing detail.

A good cover note is short:

• A greeting by name.
• The job it relates to, in the customer's words if you can.
• The invoice number and the due date, copied from the invoice.
• How to pay, or "payment details are on the invoice".
• A line saying who to contact with questions.

Follow-up messages

Chasing is easier when the tone is set before you start. Tell the tool what stage you're at, and keep it to three steps:

• A friendly reminder just after the due date. Assume it was missed.
• A clear second message a week or so later. Restate the amount, the invoice and the date, and ask for a date they'll pay by.
• A firm final notice that says what you'll do next, in plain words you've chosen.

Ask the tool for polite and direct, not threatening. Read it for tone as well as facts. A draft can sound colder or warmer than you meant.

Be careful with anything legal. Late fees, interest, debt collection and what you're allowed to say vary by country and state. Don't let a draft threaten action you haven't decided to take, or quote a law. Check the official source for your country, such as your consumer or tax body, or ask an adviser.

Before it goes out

• Does the amount in the email match the invoice exactly?
• Is it the right customer, the right job and the right invoice number?
• Are the bank or payment details copied from your own records, not typed by the tool?
• Does the tone suit this customer?
• Has someone other than the drafter looked at it, if the amount is large?

Keep the sent message with the invoice. If a customer disputes it later, the record is yours, not the chat tool's.

Customer names, email addresses and amounts are business and personal data. If you can, paste a labelled stand-in such as "Customer A" and fill in the real details yourself.