Invoices don't need to be complicated, but leaving out the wrong field can add days to how long it takes to get paid. This is the complete list — required and optional — organized in the order it should appear on the page.
Required on every invoice
- The word "Invoice" — sounds obvious, but it's what lets a client's system sort it correctly from receipts and quotes.
- Invoice number — unique and sequential, so it can be referenced without ambiguity.
- Issue date — the date the invoice was created and sent.
- Your business name and contact details — name, address, email, and phone if you use one.
- Client's name and billing address — matched to whatever's on file with their accounts team.
- Description of goods or services — specific enough to be understood without extra context.
- Quantity and rate — hours, units, or a flat fee, clearly labeled.
- Total amount due — the number that matters most, and the easiest to bury if the layout is cluttered.
- Due date or payment terms — stated as an actual date, not just "net 30."
Required if they apply to you
- Tax registration number — required in most jurisdictions if you're charging VAT, GST, or sales tax.
- Tax rate and amount — broken out separately from the subtotal, not folded into it.
- Currency — essential for any client outside your home country.
- Purchase order (PO) number — many companies won't process an invoice without one if they issued a PO.
Common bottleneck
Missing PO numbers are one of the most frequent reasons a corporate client's accounts payable team rejects or delays an invoice. If a client gave you a PO, it belongs on every invoice tied to that engagement.
Optional, but genuinely useful
- Accepted payment methods — bank details, a payment link, or both.
- Late payment terms — a stated late fee, if you charge one, disclosed upfront rather than added as a surprise.
- A short note or thank-you — costs nothing, reads as professional rather than transactional.
- Your logo — nice to have, irrelevant to getting paid.
What to leave off
Resist the urge to over-explain. Lengthy scope descriptions, contract clauses, or project history belong in the contract or a cover email — not on the invoice itself. The invoice's only job is to state what's owed and by when; anything that slows down reading it works against that job.
Every required field, already in place
The template below has each of these built in — just fill in your details and the line items.