Tax Gap: IRS Has Modernized Its Business Nonfiler Program but Could Benefit from More Evaluation and Use of Third-Party Data

A letter report issued by the Government Accountability Office with an abstract that begins "The Internal Revenue Service (IRS) does not know how many businesses failed to file required returns, nor does it have an estimate of the associated lost tax revenue--the business nonfiling tax gap. Many cases it does investigate are unproductive because the business does not owe the return IRS expects. GAO was asked to assess (1) the data challenges of estimating the business nonfiler tax gap, (2) how recent program changes have affected IRS's capacity to identify and pursue business nonfilers, and (3) additional opportunities for IRS to use third-party data. GAO reviewed IRS's tax gap estimates, nonfiler program processes and procedures, and matched closed nonfiler cases with various other data.