Does a freelance invoice need an invoice number?

Yes. A unique number lets you and the client refer to the invoice without confusion, and many tax offices expect invoices to be numbered in sequence.

Do I need to add tax to my invoice?

Only if you're registered for a sales tax such as VAT or GST, or your local rules require it. If you are, show your tax number and the tax amount separately. The rules depend on where you live, so check locally.

What's the difference between an invoice date and a due date?

The invoice date is when you issue it. The due date is when payment is expected. Write both as real dates so nobody has to calculate anything.

What to include on a freelance invoice: a complete checklist

An invoice has one job: to get you paid, quickly and without questions. Most late payments are not caused by clients who refuse to pay. They're caused by invoices that are missing something, so they get sent back, parked or forgotten.

This checklist covers everything a freelance invoice should include, whether you're a designer, writer, developer, video editor, photographer or creator. Use it as a final check before you hit send.

1. Your details

Start with who the invoice is from. Include:

Your name or business name.
Your email address, and a phone number if clients call you.
Your address, if your local rules or your client's finance team require it.
Your tax or business registration number, if you have one.
Your logo, if you use one. It's optional, but it makes the invoice look finished.

2. The client's details

Next, who the invoice is for. Use the client's legal or registered company name, not just your contact's first name. Add their address and the name of the person or department who should receive it.

If you work with an agency on behalf of a brand, check which company you should bill. Getting this wrong is one of the most common reasons an invoice comes back.

3. Invoice number and dates

Every invoice needs:

A unique invoice number. A simple sequence works well, like INV-0001, INV-0002 and so on. Never reuse a number.
The invoice date: the day you issue it.
The due date: the day payment is expected, written as a real date such as "Due 30 November 2026".

Payment terms like "net 14" or "net 30" are fine to include, but always add the actual date as well. People act on dates, not on arithmetic.

4. A purchase order or project reference

Larger clients often use purchase order (PO) numbers to approve spending. If they gave you one, put it on the invoice. Without it, your invoice may not be approved at all.

Even without a PO, add a project or campaign name, so the person approving the invoice knows exactly what it's for.

5. Clear line items

List what you did, one line per item, with:

A short description anyone can understand. "Website homepage design, 2 rounds of revisions" is better than "Design work".
The quantity, such as hours, days or pieces.
The rate per unit.
The line total.

If you charge by the hour, show the hours. If you charge a fixed fee, a single line with a clear description is enough. Add separate lines for expenses you're passing on, such as stock footage, travel or printing, if you agreed to bill them.

6. Totals, tax and currency

Below the line items, show:

The subtotal.
Any discount, as its own line.
Tax, if you're registered for one, with the rate shown.
Any deposit already paid, subtracted from the total.
The total amount due.

Write the currency next to every amount. A dollar sign can mean US, Canadian, Australian or other dollars, so "USD 1,200" is clearer than "$1,200". For international clients, agree the currency before you start.

7. How to pay you

This is the section clients look for first, so make it complete:

Bank name, account name and account number.
For international payments, the details your bank needs, such as a SWIFT/BIC code or an IBAN.
Any other way you accept payment, such as a card payment link or a service like PayPal or Wise.

Double-check these details. One wrong digit can delay payment by weeks.

8. Terms and a short note

Finish with your terms and a human touch:

Payment terms, and late-fee terms if you charge them. Only include fees you've agreed with the client.
A one-line thank you.

Common mistakes that delay payment

Sending the invoice to your creative contact instead of the person who pays.
Leaving out the purchase order number the client asked for.
A total that doesn't match the price you agreed, with no explanation.
No due date, or only "net 30" with no actual date.
Sending the invoice weeks after the work was delivered.

A quick final check

Before sending, read the invoice as if you were the client's accountant. Is it clear who it's from, who it's for, what it's for, how much it is, when it's due and how to pay? If the answer to all six is yes, send it, and send it the day the work is delivered.

Save a PDF copy of every invoice you send and note when each one is paid. At the end of the year, you'll have a full record of your income ready for your taxes.