What Should an Invoice Include?

It's easy to assume an invoice just needs "the amount owed," but a good invoice is really a small piece of documentation — it needs to hold up if a client's bookkeeper asks a question six months from now, or if you need to reference it during tax season. Here's a full rundown of what to include and why each part earns its place.

Sender (your) information

Your name or business name, address, email, and phone number if relevant. If you have a registered business number or tax ID that's required in your country, add it here as well. This is the section that answers "who is this invoice from."

Client information

The client's name or company name and billing address. For businesses with multiple departments, it's worth asking which contact or department should be listed so the invoice reaches the right person for approval.

Invoice number

A unique identifier for this specific invoice, ideally sequential (INV-0001, INV-0002, and so on). It's how both sides reference the invoice in payment records, emails, or accounting software.

Invoice date and due date

The issue date marks when the invoice was created. The due date tells the client exactly when payment is expected — vague terms like "soon" lead to slow payments, while a specific date gives you a clear point to follow up from.

Description of goods or services

Each line item should describe what was delivered in enough detail that anyone reading it later — including you — understands what was billed. "3 hours of consulting on March 4" is more useful than "Consulting."

Quantity and rate

Show the quantity (hours, units, or sessions) and the rate per unit separately, rather than just a total. This transparency is what lets a client verify the math themselves instead of having to ask you to explain it.

Subtotal

The sum of all line items before tax or discounts. It's a useful checkpoint that makes the rest of the math easy to follow.

Taxes

If you're required to charge sales tax, VAT, or GST, show it as its own line with the percentage applied, calculated from the subtotal (or the discounted subtotal, if a discount applies first). Requirements vary by country and by your registration status, so if you're unsure whether you should be charging tax, that's worth checking with a local accountant rather than guessing.

Discounts

If you're offering a percentage or flat discount, show it as a separate line rather than adjusting the rate directly. This keeps your original rate visible for your own records and makes the discount obvious to the client.

Total due

The final amount owed after tax and discounts, shown prominently — this is the number the client actually needs to act on.

Payment terms

How you'd like to be paid (bank transfer details, a payment link, PayPal, etc.) and any late-payment terms you apply. Stating this clearly avoids a second email asking "how do I pay this?"

Notes

A short line for anything else relevant — a thank-you note, a reference to a signed agreement or purchase order number, or specific instructions for larger clients that require one.

Once you know what belongs on an invoice, actually building one is the easy part — our free invoice generator has all of these fields ready to fill in, with a live preview so you can see the finished invoice as you go.