The IRS handles the millions of income tax returns filed by individuals and corporations, and frequently performs auditing functions relating to these income tax returns and the accounting records on which they are based.

• 国内税收署掌握了由个人和公司填写的成百万的所得税申报单,并经常对这些所得税申报单和作为其基础的会计记录执行审计职能。