What Is an Invoice? A Complete Beginner's Guide

An invoice is a commercial document that a seller sends to a buyer, requesting payment for goods or services that have been delivered. It acts as a formal record of a transaction and is used by both the seller and the buyer for accounting and tax purposes.

Why invoices matter

Invoices aren't just a formality. For your business, they create a paper trail that helps you track income, follow up on unpaid amounts, and stay organised at tax time. For your customer, an invoice is proof of what was purchased, at what price, and when payment is due.

Key parts of an invoice

• Your business name, address and contact details
• The customer's name and details
• A unique invoice number and date
• An itemised list of products or services provided
• Applicable taxes (such as GST) and any discount
• The total amount due and payment terms

Invoice vs bill vs receipt

These three terms are often used loosely, but they mean different things. An invoice requests payment before it is received. A bill is essentially the same thing from the buyer's point of view. A receipt is issued after payment has been made, confirming that the transaction is complete.

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