How to make an invoice

An invoice is a request for payment, but it does more than ask for money. It sets a deadline, documents what you delivered, and becomes part of your financial records. A clear invoice tends to get paid with fewer questions. A vague one invites delays.

This guide walks through each part of a professional invoice in the order you'd build it, with a worked example and a short check to run before you send. It applies whether you bill one client a month or fifty.

Before you start: gather the details

Most invoicing mistakes happen before the invoice is written. Pull these details together first, so you aren't guessing at a billing address or the hours you logged two weeks ago.

• Your business details: your legal or trading name, address, email, phone, and any tax or registration number your jurisdiction requires.
• Client details: the company name, the person or department responsible for paying, and their billing address.
• A record of the work: hours, deliverables, materials, or milestones, ideally matched to an approved estimate or contract.
• Agreed terms: the payment deadline, accepted payment methods, and any deposit already received.

Step by step: building the invoice

1. Add a clear header

Put the word Invoice at the top in large type. It sounds obvious, but a document labeled "Statement" or "Bill" can be routed to the wrong place in a client's finance team. Add your logo, business name, and contact details beside or below it.

2. Assign an invoice number

Each invoice needs a unique number that is never reused. A simple sequence like INV-0042 works well. If you're setting up a system for the first time, our guide to invoice numbering compares the common formats.

3. Add the dates

Include the issue date and the due date. If your terms are Net 30, write the calendar date as well: "Due: October 31, 2026." Clients rarely calculate deadlines for you, and a specific date is harder to overlook.

4. Itemize the work

List each product or service on its own line with a description, quantity, rate, and line total. Write descriptions the client will recognize. "Homepage design, two revision rounds" is better than "Design work," because the person approving the invoice can match it to what they agreed to.

5. Calculate the totals

Show the subtotal, then any discounts, then tax if it applies, then the total due. If the client paid a deposit, subtract it on its own line and show the remaining balance. Double-check the math. A small arithmetic error is enough for some finance teams to send an invoice back.

6. State payment terms and methods

Spell out when and how you expect to be paid. Name the accepted methods, such as bank transfer, card, or check, and include the details needed to use them. Not sure which terms to choose? See invoice payment terms explained.

7. Add a short note

A one-line thank-you or a reference to the project is enough. Keep it brief. The notes field is not the place to introduce new terms the client hasn't already agreed to.

A worked example

Here is how the line items might look for a freelance web designer billing a small business for a site refresh, with a deposit already paid.

Notice that the deposit appears as its own line. The client can see exactly what they've already paid and what remains, which removes a common source of back-and-forth. The descriptions are specific enough that nobody has to ask what "page templates" means.

Taxes, currency, and legal details

Whether you need to charge sales tax, VAT, or GST depends on where you and your client are located, what you sell, and sometimes how much you sell. The rules vary by country and, in the US, by state. If you're unsure, check with an accountant or your local tax authority before adding or leaving out tax.

A few general practices hold in most places:

• Show tax as a separate line rather than folding it into item prices, unless local rules say otherwise.
• Include your tax registration number if your jurisdiction requires it on invoices.
• State the currency, especially for international clients. "$" alone can mean US, Canadian, or Australian dollars.
• Keep a copy of every invoice you issue. Tax authorities generally expect businesses to retain records for several years.

Sending the invoice

Send the invoice as soon as the work is delivered or the milestone is reached. The longer you wait, the less urgent it feels to the client, and the later your payment arrives.

1. Export a PDF or send a link to an online invoice. A link lets the client pay directly if you accept online payments.
2. Address the email to the person who pays, and copy your main contact if appropriate.
3. Use a clear subject line, such as "Invoice INV-0042 from Northwind Studio, due Oct 31."
4. Put the amount and due date in the body of the email, not only in the attachment.
5. Set a reminder for a few days before the due date, or turn on automatic payment reminders.

Make your next invoice faster

Once you've made one good invoice, the next should take a fraction of the time. Save your business details, reuse your line-item descriptions, and keep your terms consistent from client to client. For a head start, choose a layout from our invoice templates, or fill in the free invoice generator and download a PDF in a few minutes.