Invoice
An invoice is a document a seller sends to a buyer to request payment for goods or services delivered.
An invoice is the bill you send a client after doing the work or shipping the product. It lists what you provided, how much it costs, and how and when to pay. For most freelancers and small businesses, the invoice is the core record that turns a finished job into actual money in the bank.
What it means
An invoice is a formal, dated request for payment. It identifies the seller and the buyer, describes the items or services with quantities and prices, totals everything up (often including tax), and states the payment terms and due date.
A proper invoice also carries a unique invoice number. That number lets both sides reference the bill later, keeps your records in order, and is usually required for tax and bookkeeping. Once you issue an invoice, it becomes an accounts receivable until the client pays it.
What an invoice includes
Most invoices share the same building blocks, even across industries and countries.
- A unique invoice number and issue date
- Your business name, address, and contact details
- The client's name and billing address
- A line-by-line list of goods or services with quantities and unit prices
- Subtotal, any tax (such as VAT or sales tax), and the total due
- Payment terms, due date, and accepted payment methods
Example
A web designer finishes a project and sends invoice INV-0042 dated June 1. It lists "Website redesign — 30 hours at $80" for $2,400, adds no tax, and sets terms of Net 30, so payment is due by July 1.
In Platybooks the invoice gets a gapless number automatically, shows a live PDF preview, and can include a hosted payment link so the client pays in a couple of clicks. When the payment lands, the invoice status updates on its own.
Frequently asked questions
What is the difference between an invoice and a receipt?
An invoice requests payment before it is made, while a receipt confirms that payment has already been received. You send an invoice to ask for money and issue a receipt to prove the money arrived.
Does every invoice need a unique number?
Yes. A unique, sequential invoice number keeps your records traceable and is generally expected for tax and accounting. Tools like Platybooks generate these numbers automatically so there are no gaps or duplicates.
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