The provisions of the Sarbanes-Oxley Act have limited a public company’s choice of auditors by placing a strong emphasis on maintaining independence between the auditor and the client. Before the Sarbanes-Oxley Act, accounting firms could provide auditing services as well as other services including consulting services to companies and still, in the eyes of the law, maintain independence. After some big scandals came out in the early 2000’s, including the Enron scandal, there was a strong push for more restrictions on the nonaudit services that auditors could provide to clients. The Sarbanes-Oxley Act put into place restrictions on these services and created the PCAOB which provided oversight on auditing services and has the job of making sure that independence is maintained in all cases. This is a change from the past where it was the auditors responsibility to make sure that independence is maintained between themselves and the client.
There are some advantages to allowing auditors to provide nonaudit services to their audit clients. One advantage would be that it makes it easier for the client to acquire multiple services from one accounting firm instead of having many different services provided by