If you're here looking up IRS customer care, you probably already know who they are. But it helps to get an idea of how big they are and what their support operation looks like if you are a customer. IRS also goes by or is associated with the names Internal Revenue Service, US Internal Revenue Service, USIRS, US IRS, irsafam. They are considered to be part of the following sectors and industries: Tax collection. IRS is associated with terms like private by their customers and industry analysts. Their competition, in the eyes of customers, are companies like "Nobody competes with the IRS because it's a government agency.". They employ 80,000 people according to customers in the know.