# What is an invoice?
An invoice is a commercial document issued by a seller to a buyer that itemizes products or services provided and states the payment amount due. It includes key details like invoice number, date, seller and buyer information, description of goods/services, quantities, unit prices, total amount, payment terms, and due date. Invoices serve as official requests for payment and legal records of transactions between businesses. Common invoice formats include PDF, paper, electronic invoices (e-invoices), and structured data formats like XML or EDI.
## Key Takeaways
- An invoice is a commercial document issued by a seller to a buyer that itemizes products or services provided and states the payment amount due.
- It includes key details like invoice number, date, seller and buyer information, description of goods/services, quantities, unit prices, total amount, payment terms, and due date.
- Invoices serve as official requests for payment and legal records of transactions between businesses.
## Related Topics
- invoice
- what is an invoice
- invoice definition
- invoice document