In business IT, billing software refers to programs that handle the tracking of billable products and services delivered to a customer or set of customers. These types of programs automate much of what used to be a time-consuming process of preparing invoices or other documentation. The online invoicing software uses the database inside the system and pulls out the unbilled work items. Basic, simplistic invoicing, billing and collection procedures can be both effective and inexpensive. Yet the key is to maintain careful attention to and consider the details of your billing process flow.