This session will skim the IRS publication “Discount for Lack of Marketability – Job Aid for IRS Valuators” published by the IRS August 22, 2011 with an update on additional sources, and methods as well as provide recommendations for consideration when developing a DLOM. Mike presents his perspective having worked with a number of appraisers on this issue. Next a look at six pertinent court cases associated with “tax affecting” are explored including a more detailed look at the most recent court case on this issue. Five of the most popular models used for “tax affecting” are introduced and discussed. Finally, Mike presents his personal perspective on the issue and invites attendees to share their views. In addition a spreadsheet is presented for consideration prepared by Guy Sanchagrin.