How to Write an Invoice as a Freelancer (Step-by-Step + Checklist)

The 11 things every invoice must contain

Skip any of these and you've given an accounts-payable reviewer a legitimate reason to send it back unpaid.

• The word "Invoice" (or "Tax invoice" in Australia)
• A unique, sequential invoice number
• Issue date and due date
• Your legal or trading name, address, and email
• The client's legal entity name and billing address
• Your tax/company registration number, if you have one
• Itemised description, quantity, unit price, and line total
• Subtotal
• Tax line showing the rate and amount, if applicable
• Discount, shipping, or expenses, if any
• Total due, with the currency code, and payment instructions

Numbering invoices so you never have to explain a gap

Sequential (0001, 0002...) or date-based (INV-2026-014) both work — pick one and stick to it. Per-client prefixes (ACME-007) are useful once you have several regular clients.

Never reuse or skip a number. A gap in the sequence looks like a missing invoice to an accountant, even if the real explanation is a cancelled draft.

Setting payment terms that actually get paid

Net 7/14/30 or Due on Receipt are all fine — what matters more is printing a literal calendar due date, not just the term. "Net 30" alone forces the reader to do the maths.

For projects over a couple of weeks, consider asking for a deposit before work starts.

Do you have to charge tax?

Registration thresholds vary by country. If you're not registered, say so on the invoice ("No VAT charged — not VAT registered") rather than leaving the line blank with no explanation.

This is general information, not tax advice — check current rules with your local tax authority.

Write your first invoice in four minutes

Use a template that already has the required fields laid out, so you're filling in blanks rather than designing a document from scratch.

1. Open the invoice generator and pick the preset closest to your trade.
2. Fill in seller and client details once — they're saved locally for next time.
3. Add line items with quantity and rate.
4. Set tax, discount, or shipping if this invoice needs them.
5. Paste your notes and payment terms.
6. Download the PDF, and keep the saved copy to duplicate next month.

After you send it: chasing late payment without burning the client

A simple cadence works better than an awkward one-off message: confirm receipt, a gentle nudge on the due date, a firmer follow-up a few days later, then a statement of account if it's still unpaid.

Seven mistakes that delay payment

• No due date
• Line items too vague to approve ("Design work — $2,400")
• Missing a PO or project reference the client's system requires
• Sending an editable file instead of a PDF
• No currency code on a cross-border invoice
• No deposit on a project longer than two weeks
• Emailing it to your day-to-day contact instead of accounts payable

Key takeaways

• A unique number, a literal due date, and specific line items remove every excuse to delay.
• Set terms before you start the project, not on the invoice.
• Generate and store invoices locally — no account, nothing uploaded.

Frequently Asked Questions