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What should an invoice include?
Updated June 24, 2026
A complete invoice includes the word “Invoice,” a unique invoice number, the issue and due dates, your and your client's name and contact details, an itemized list of charges with quantities and rates, the subtotal, any tax, the total due, and clear payment terms and methods.
Every invoice should include
- The word "Invoice" — so it's unmistakable and easy to file.
- A unique invoice number — for your records, the client's, and tax purposes.
- Issue date and due date — and the payment terms (e.g. Net 30).
- Your business details — name, address, email, and any tax or registration number.
- Your client's details — the billing name and contact.
- Itemized line items — a description, quantity, and rate for each.
- Subtotal, tax, and total due — with the currency stated.
- How to pay — accepted methods and a payment link or instructions.
Optional but recommended
These aren't strictly required, but they help you get paid faster and look more professional:
- Your logo and brand, so the invoice matches your other client documents.
- A late-fee policy stated up front, so it's enforceable if the invoice goes overdue.
- A short thank-you or notes line for payment instructions or context.
- A purchase-order number if your client's accounts team requires one.
Common invoicing mistakes to avoid
The fastest way to delay payment is an invoice that's unclear or incomplete. Avoid reusing invoice numbers, leaving off the due date, burying the total, or omitting how to pay. If you accept cards, decide in advance whether you'll absorb or pass on the processing fee so the total reflects what you actually need to receive.