Creating your first invoice

Before creating an invoice, you need: 1) At least one invoice series (Settings > Invoice Series — e.g., prefix 'A' for ordinary invoices). 2) At least one client in your directory (Clients > Add client). Then go to Invoices > New invoice, select a client and series, add line items with descriptions, quantities, unit prices, and IVA types. The system calculates totals automatically. Save as draft, then mark as sent when ready.