Recently, in Estate of Kollsman v. Commissioner (T.C. Memo. 2017-40), the U.S. Tax Court held that an art collector’s estate significantly underreported the value of two artworks for estate tax purposes. The problem: the estate relied on appraisals by an auction house specialist who had an incentive to “lowball” the appraisals to win the right to later auction the works. In addition to this conflict of interest, the court found that the values reported by the estate were unpersuasive because the auction house specialist exaggerated the dirtiness of the paintings and failed to adjust his appraisals after one of the works sold at auction for approximately five times more than the reported value. Here’s what you need to know about the case.