In the US, the Sarbanes-Oxley Act [0] is in place to prevent just that and maintain independence between conducting an audit or providing consulting services. S

In the US, the Sarbanes-Oxley Act [0] is in place to prevent just that and maintain independence between conducting an audit or providing consulting services. Similar other regulations exist in Canada [1] and other nations. The Big Four and other firms that are subject to these regulations often do one or the other with clients. It is not common for a firm to be the financial auditors and the provider of consulting services to the clients. [0] https://en.wikipedia.org/wiki/Sarbanes%E2%80%93Oxley_Act https://en.wikipedia.org/wiki/Sarbanes%E2%80%93Oxley_Act [1] https://en.wikipedia.org/wiki/Keeping_the_Promise_for_a_Strong_Economy_Act_(Budget_Measures),_2002 https://en.wikipedia.org/wiki/Keeping_the_Promise_for_a_Stro...