Notes: Include any additional info your customer should know, including terms of service and payment terms (for example, payments are due 30 days after the invoice has been issued).Total: Outline the total amount due from the customer, after tax.

This is legally required to provide on invoices, and your rate may differ depending on where you run your business. For each line item, include a brief description, quantity, individual unit price, and total price. For example, if you're sending your very first customer their first invoice, the invoice number could be 001-001. You can format this based on sequence and customer. Theres Word and Excel or a variety of different types of invoicing software.