Whattowritewhensendinganinvoice

The email is not the invoice. Its only job is to get the invoice into the right system without anyone needing to reply.

4 minute read · Updated

Short answer

Put the invoice number, the amount and the due date in the subject line, attach the PDF rather than linking it, and keep the body to three sentences: what the invoice is for, what the total and due date are, and how to pay. Copy accounts payable as well as your contact. The most useful sentence you can add is a question that surfaces problems early — asking whether anything further is needed to process it.

The subject line

It has to be identifiable in a list of two hundred and searchable six months later. Three elements do that:

Invoice INV-202608-001 · ₹1,85,000 · due 23 September

Not “Invoice”, not “Invoice attached”, not “Following up on our work”. The number is what their system keys on and what you will quote in every subsequent message about it.

The body

Hi [name], Attached is invoice INV-202608-001 for the August performance marketing retainer — ₹1,85,000, due 23 September 2026. Bank and UPI details are on the invoice. I've copied [accounts@client.com]. Could you confirm it's in the system, and whether anything further is needed from me? Thanks, [you]

Three sentences, and the last one is the one that earns its place. “Is anything further needed?” surfaces a missing PO number or an unapproved line in two days instead of five weeks, and it costs nothing to ask.

The mechanics that matter

  • Attach the PDF. Never a link — links expire, require logins the finance team does not have, and cannot be attached to an approval workflow.
  • Name the file properly. “Invoice - INV-202608-001 - Northline Retail.pdf”, not invoice-final-2.pdf.
  • Copy accounts payable. The person who commissioned the work rarely pays for it.
  • Use the portal where there is one. If the client has a supplier portal, the portal submission is the invoice and the email is a copy.
  • Repeat the key facts in the body. Some approval systems strip attachments; the amount and due date should survive that.

The reference

What to put on an invoice

The fields every invoice needs, the four omissions that hold payment up, and how to word payment terms so an invoice does not sit in an inbox for a month.

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Questions people ask

The invoice number, the amount and the due date — “Invoice INV-202608-001 · ₹1,85,000 · due 23 September”. The number is what the recipient's system keys on and what you will quote in every follow-up. A subject line reading just “Invoice” is unfindable a month later.

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