An invoice is a document that one business or person sends to another to request payment for goods or services provided. It is essentially a formal bill.
Invoices serve two purposes: they tell the customer what they owe and they create a record of the transaction for both sides.
What an Invoice Contains
A standard invoice includes:
- The seller's business name and contact information
- The buyer's name and contact information
- A unique invoice number
- The date the invoice was created
- A list of products or services with quantities and prices
- The total amount due
- Tax information if applicable
Invoice vs Receipt
An invoice is a request for payment, sent before or at the time of delivery. A receipt is a confirmation of payment, issued after payment has been made.
When a customer pays your invoice, you can issue a receipt to confirm the payment.
Who Uses Invoices?
Invoices are used by:
- Freelancers billing clients for work done
- Small businesses selling products or services
- Consultants billing project fees
- Agencies billing retainer or project fees
- Any individual or business that provides something in exchange for payment
When Do You Send an Invoice?
Common practice is to send an invoice when the work is completed or when the goods are delivered. Some businesses send invoices at the start of a project (proforma invoice), at the end of a project, or on a regular billing cycle.
For ongoing work, such as monthly retainers, it is common to send an invoice at the start or end of each month.
Why a Professional Invoice Matters
A clear invoice makes it easier for the customer to pay. It also gives you a paper trail — useful for your own accounts, for tax purposes and in case of any dispute about what was agreed.
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