What should an invoice include? Your details, the client's details, a unique number, itemized work, totals, tax, payment terms, and a way to pay. A complete checklist — then a map of each element to its Fee-Lion field. Billing Basics Getting Paid Invoices

How do I write an invoice? List the work, set quantities and rates, add tax and terms, then send. A step-by-step on what goes into a clear, professional invoice. Billing Basics Getting Paid Invoices

What is a proforma invoice? A proforma invoice is a preliminary bill sent before work or delivery, showing expected charges. It isn't a demand for payment yet — and in Fee-Lion, your estimate plays exactly that role. Billing Basics Estimates Invoices

What Is an Invoice Number? An invoice number is a unique identifier on each invoice that keeps your records organized and helps clients reference payments. Billing Basics Getting Paid Invoices