What is an invoice?
By Diljit Ramachandran, founder of The Invoice Generator. Published Oct 26, 2026.
An invoice is a document a seller gives a buyer that lists what was sold or done, the amount owed and when it must be paid. It is a request for payment, not proof of payment. A clear invoice has a unique number, both parties' details, itemized lines, a total and payment terms.
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What does an invoice include?
An invoice number is a unique reference that identifies one invoice; many countries require it. Payment terms are the agreed deadline for paying it. The full checklist goes further, but these seven parts make a complete invoice:
- Invoice number and date
- The seller's name and address
- The client's name and address
- A line for each item or service, with quantity and rate
- The total, with tax and discounts on their own lines
- Payment terms, such as Net 14
- How to pay: bank account, payment link or cheque payee
Who gives an invoice, and who receives it?
The seller, such as a freelancer or supplier, gives it. The buyer, the client, receives it and pays. Buyers often call it a bill; see invoice vs bill.
What is the difference between an invoice and a receipt?
An invoice asks for money that is owed. A receipt confirms money that was received. You send the invoice first and the receipt after payment arrives; see invoice vs receipt.
When do you send an invoice?
Usually when the work is done or the goods ship; a deposit invoice can come earlier. Terms usually run from the invoice date, so a late invoice means late payment. To make one, see how to make an invoice.
What does a simple invoice look like?
Invoice 1042, dated 3 March. Logo design, 10 hours at 50 each, total 500 (USD). Terms: Net 14, so due 17 March. Pay by bank transfer. Other types include the proforma invoice and the credit note.
Questions
- What does invoicing mean?
- Invoicing means sending invoices to clients and keeping track of who has paid.
- Is an invoice a legal document?
- It is a business record and often evidence of a sale. What it must contain, and how long to keep it, depends on your country, so check the local rule.
Keep every document in one place
- A free account saves a copy of each invoice, remembers your clients and items, and shows what is paid and overdue.
- Pro numbers your invoices for you, emails payment reminders, and repeats the ones you send every month.
Drafted with AI assistance from public sources and our own tool, and published by Diljit Ramachandran. It has not been checked by an accountant. It is general information, not tax or legal advice. Rules differ by place; check with an accountant or your local tax office.