Founded in 1955, H&R Block is one of the largest tax services providers in the world. It is a fully integrated service company that assists customers in saving for retirement, buying a home, paying for college, as well as managing a business. Based in Phoenix, Ariz., it operates more than 12,000 offices in the United States. Additionally, H&R Block has prepared over 400 million tax returns. The company offers business services through RSM Gladrey and provides financial products to support its tax business through H&R Block Bank.