Every organization has a mission. For for-profits, it is to create profit for the owners or shareholders. In the nonprofit sector there are just about as many missions as there are organizations.
On December 29, 2022, President Biden signed the Consolidated Appropriations Act, 2023, which includes the provisions of the Securing a Strong Retirement Act, commonly called SECURE 2.0.
Invoices may need to be prepared for a number of reasons. Some organizations sell books or newsletters for a fee. Others require registration for meetings or bill for dues.