Since the 2014 edition, there have been important case law and administrative developments in the wake of Rev. Proc. 2013-34 as well as legislative changes to Section 6015 of the Internal Revenue Code. This edition incorporates updates in the Code, Tax Court and Circuit Court case law, and IRS practices, and alerts readers to important issues likely to be litigated over the coming years under the Taxpayer First Act of 2019. This edition also offers three new chapters and substantial revisions to others: