How to Make an Invoice: Step-by-Step Guide

Updated October 25, 2026

An invoice is the document you send a customer to ask for payment for products or services. A clear, complete invoice gets you paid faster, keeps your records tidy and protects you if there's ever a dispute. This guide walks you through every part of an invoice, step by step, with an example you can copy.

How to make an invoice in 9 steps

1. Choose how you'll create it

   You can write an invoice in a word processor or spreadsheet, but you'll have to do the math yourself and rebuild the layout every time. An invoice generator such as invoices.net gives you a ready-made template, calculates totals and tax for you, numbers your invoices, and exports a clean PDF. It's free and works in your browser.

2. Add your business details

   At the top, put who the invoice is from: your business name (or your own name if you're a freelancer), address, email and phone number. Add your logo if you have one, as it makes the invoice look professional and easy to recognize.

   If you're registered for sales tax, VAT or GST, include your tax or registration number. Some countries also require a company registration number.

3. Add your customer's details

   Under Bill To, write the name of the person or company paying, with their address. For businesses, add the contact person or department (for example "Accounts Payable"), which helps your invoice reach the right desk. If you're shipping goods to a different address, add it under Ship To.

4. Give it a unique invoice number

   Every invoice needs its own number so you and your customer can refer to it, and so your bookkeeping and tax records add up. Number them in order, with no gaps or repeats: 1, 2, 3 or INV-0001, INV-0002. Some businesses add the year (2026-001) or a customer code.

   If your customer gave you a purchase order (PO) number, add it too. Many companies won't pay an invoice without one.

5. Set the date and payment terms

   The invoice date is the day you issue it. The due date is when payment is expected. Payment terms describe the gap between them:

   • Due on receipt: pay immediately. Common for small jobs and one-off customers.
   • Net 7 / Net 14: pay within 7 or 14 days. Common for freelancers.
   • Net 30: pay within 30 days. The standard between businesses.

   Always write the actual due date, not just "Net 30", so there's no doubt about when payment is late.

6. List your products or services

   Add one line for each item: a clear description, the quantity (units, hours or days), the rate (price per unit) and the amount (quantity × rate). Be specific: "Logo design, 3 concepts + 2 revisions" is better than "Design work". Clear descriptions mean fewer questions and faster payment.

7. Add tax, discounts and shipping, then the total

   Below the lines, show the subtotal, then any discount, tax and shipping, and finally the total. If the customer already paid a deposit, show it as amount paid so the balance due is what they still owe. Choose the currency your customer will pay in.

   Tax rules depend on where you and your customer are. If you're not sure whether to charge tax, check with your local tax authority or an accountant.

8. Explain how to pay you

   Make paying easy. In the notes or terms, list the ways you accept payment: bank transfer details, a payment link, PayPal, card or check. Add anything else the customer should know, such as a late fee policy (only if you agreed it upfront) or a short thank-you.

9. Review, download and send

   Check names, amounts and dates, then download the invoice as a PDF and email it to your customer, or send it straight from invoices.net. Use a clear subject line such as "Invoice 0042 from Your Business, due Nov 30". Keep a copy, and mark the invoice as paid when the money arrives.

Invoice example

Here's what a complete invoice looks like for a freelance designer. It has every part from the steps above.

What an invoice must include

The exact rules depend on your country, but a professional invoice almost always has:

• The word "Invoice" clearly at the top
• Your business name, address and contact details
• Your tax or VAT/GST number, if you're registered
• The customer's name and address
• A unique, sequential invoice number
• The invoice date and the due date
• A description, quantity and price for each item
• Subtotal, tax, discounts and total due, in one currency
• Payment instructions

Need a different document? A quote or estimate comes before the work, a proforma invoice asks for payment before delivery, a receipt confirms payment, and a credit note corrects or refunds an invoice.

Common mistakes to avoid

• No due date. "Payable soon" gets paid later. Always write a date.
• Repeating or skipping invoice numbers. It confuses your customer's accounts team and your own records.
• Vague descriptions. "Services" invites questions. Say what you did and when.
• Missing payment details. If customers have to ask how to pay, they'll pay later.
• Sending an editable file. Send a PDF or a link, not a Word or Excel file.
• Invoicing late. Send the invoice as soon as the work is done or delivered. The sooner you invoice, the sooner you're paid.
• Not following up. A friendly reminder on the due date solves most late payments.

Frequently asked questions

Related guides

• Free Invoice TemplateA free template you fill in online: every field explained, plus templates for quotes, receipts and more.
• Invoice vs ReceiptAn invoice asks for payment, a receipt proves it. When to send each, with examples.
• What Is a Proforma Invoice?What a proforma invoice is, when to use one, and how it differs from an invoice and a quote.
• UK VAT InvoiceWhat HMRC requires on a VAT invoice, full vs simplified invoices, and a worked example.
• Canada GST/HST InvoiceWhat the CRA requires on GST/HST invoices, provincial rates, and a worked example.
• Australia Tax InvoiceThe ATO's tax invoice requirements, GST at 10%, invoices without GST, and an example.