Invoices
Customers — one statement each, across every invoice
A customer exists once an invoice names them. Statement date is today; overdue is anything past its due date and not paid.
Your business — on every invoice and statement
One invoice sequence for the company. If you are continuing an existing numbering, set the next number here; a number typed by hand on an invoice moves it forward, never back.
Backup & restore
Everything here lives in this browser. Save a copy now and then; open it on another computer to carry the ledger across.