The United States Public Company Accounting Oversight Board (PCAOB) has issued a concept release to solicit public comment on ways that auditor independence, objectivity and professional scepticism can be enhanced, including through mandatory rotation of audit firms. The proposals follow earlier proposals for audit reform in Europe.

Comments on the proposals are due by 14 December 2011 and a public roundtable on auditor independence and mandatory audit firm rotation is expected to be held in March 2012.