What is the difference between recurring invoices and automatic invoices?

If you are charging your clients the same amount for the same type of work on a regular basis, you can simplify the billing process by setting up recurring invoices. This will generate invoices at a specific interval for a fixed amount. On the other hand, automatic invoices automate the billing process by allowing you to schedule your billing at specific intervals for the calculated amount, which depends on the logged time and expenses.