What Is an Invoice?
An invoice is a commercial document a seller sends to a customer to request payment for products or services.
What an invoice does
It records the seller, customer, supply, amount due, and payment deadline. It supports billing and bookkeeping but is not itself proof that payment occurred.
Core invoice information
Most invoices identify both parties, carry a unique number and dates, itemize charges, calculate taxes and totals, and explain how to pay.
Invoice timing
Businesses may invoice before delivery, at milestones, after completion, or on a recurring schedule according to their agreement.
Keeping invoice records
Consistent numbering and stored copies help answer customer questions and reconcile income. Retention obligations depend on applicable rules.
Put it into practice
Use a suitable small business invoice template, or follow the complete invoice creation guide.