Invoice Format: What to Include, With a Sample Layout

The standard invoice format, top to bottom

An invoice has a conventional order because accounts teams read hundreds of them. Put things where people expect them and your invoice gets approved without a question.

1. Header

Top left: your logo and business name, address, phone, email, website and tax number. Top right: the word INVOICE, the invoice number, the issue date and the due date. Keep the header to a third of the page.

2. Parties

Below the header, a Bill to block with the client's legal name, address and tax number where required. If goods ship somewhere else, add a Ship to block beside it. A purchase order number goes here too when the client issued one.

3. Line items

A table with four columns: Description, Quantity, Rate (or unit price) and Amount. Services can use hours as the quantity; products use units. Group items under headings if the invoice is long, and keep each description specific enough to be checked against the order.

4. Totals

Right-aligned under the table: Subtotal, Discount (if any), Tax with its rate, and Total due in bold. If part has been paid, add Amount paid and Balance due.

5. Payment terms and notes

How to pay (bank details or payment link), when (repeat the due date or the terms), what happens if payment is late, and a short thank-you. Keep it to four or five lines.

A sample layout you can copy

Left header: Okonkwo Design · 210 Bergen St, Brooklyn NY 11217 · nadia@okonkwo.design · EIN 12-3456789 Right header: INVOICE · #INV-0042 · Issued 3 Sep 2026 · Due 3 Oct 2026

Bill to: Harbor Coffee Roasters LLC, 88 Front St, Brooklyn NY 11201 · PO 2026-114

Items: Logo refresh, 1, $1,200.00, $1,200.00. Menu board design, 2, $350.00, $700.00. Print files and handover, 1, $150.00, $150.00.

Subtotal $2,050.00 · Tax 0% · Total due $2,050.00

Payment: Bank transfer to Chase, routing 021000021, account 123456789, or pay by card at the link. Net 30. 1.5% monthly interest on late balances. Thank you.

The free invoice generator produces exactly this layout as a PDF, and the invoice templates come in PDF, Word and Excel if you want to fill the format yourself.

Variations on the format

• Tax invoice (VAT, GST). Add the words "Tax invoice", your registration number, the buyer's number for business sales, and show tax per rate. Required in the EU, UK, Australia, India and elsewhere.
• Service invoice. Quantity is hours or days; add the period covered ("1 to 15 September") to each line or in the header.
• Product invoice. Add SKUs or product codes and a Ship to block; consider a separate shipping line before tax.
• International invoice. State the currency explicitly, add both parties' tax numbers, and use a commercial invoice format when goods cross a border.
• Deposit or partial invoice. Say what share of the project it covers and reference the estimate.
• Recurring invoice. Same format, with the billing period in the header and a consistent numbering scheme from the invoice number generator.

Format rules that prevent disputes

1. One invoice number per document, never reused.
2. Dates in an unambiguous form (3 Sep 2026, not 03/09/2026).
3. The same currency throughout.
4. Tax shown as a rate and an amount.
5. The total due visible without scrolling or turning the page.
6. PDF, not an editable file, when you send it. Keep the editable version for yourself.

Get the format right once and every invoice after it is a copy. BillingOtter keeps your header, clients and numbering so each new invoice is a few clicks.