On November 16, 2017, we participated in a panel discussion at Tax Executives Institute’s (TEI’s) Chicago International Tax Forum regarding base erosion measures under the (then proposed) House and Senate tax reform bills. The House proposed a new 20 percent excise tax on most related-party payments (other than interest) that are deductible or includible in cost of goods sold or depreciable/amortizable basis. The Senate proposed a base erosion minimum tax on certain outbound base erosion payments paid by a corporation to foreign related parties. The conference committee has since submitted a conference report to accompany the Tax Cuts and Jobs Act that adopts the Senate’s proposed base erosion measure, with some changes. The base erosion minimum tax is equal to the excess of 10 percent of the modified taxable income of the corporation over an amount equal to the taxpayer’s regular tax liability reduced by certain Chapter 1 credits. The base erosion minimum tax could impact any multinational group in which foreign affiliates provide services, intellectual property, depreciable or amortizable property and other deductible items to related US corporations. It remains to be seen how the base erosion minimum tax will affect businesses in practice, and how countries with which the United States has a tax treaty will respond .