More document types get added here as we write them — for now, the two most common ones that come up alongside an invoice:
Document types: advance invoices, credit notes, and more
Short references for the documents that show up around invoicing — what each one is, when you need it, and how it differs from a regular invoice.
Beyond the invoice itself, a few other document types come up regularly in day-to-day business: an advance (proforma) invoice requests payment before delivery, and a credit note corrects an invoice after the fact. Each has its own purpose — pick one below.