Tariffs imposed under the International Emergency and Economic Powers Act (IEEPA) account for about 9.5pp of our estimated 14.7pp effective tariff rate after the reduction in fentanyl tariffs on China. Therefore, the Supreme Court's decision could have important implications for activity, inflation, deficits, debt, interest rates, and the dollar. We discuss risks and scenarios after the oral hearings. As expected US Treasury maintained nominal coupon sizes unchanged but also did not guide towards higher bill share. Instead guidance suggests appetite to grow coupon supply in 2027. We discuss scenarios and implications for the US rate and spread curve.   You may also enjoy listening to the Merrill Perspectives podcast, featuring conversations on the big stories, news and trends affecting your everyday financial life.   "Bank of America" and “BofA Securities” are the marketing names for the global banking businesses and global markets businesses (which includes BofA Global Research) of Bank of America Corporation. Lending, derivatives, and other commercial banking activities are performed globally by banking affiliates of Bank of America Corporation, including Bank of America, N.A., Member FDIC. Securities, trading, research, strategic advisory, and other investment banking and markets activities are performed globally by affiliates of Bank of America Corporation, including, in the United States, BofA Securities, Inc. a registered broker-dealer and Member of FINRA and SIPC, and, in other jurisdictions, by locally registered entities. ©2025 Bank of America Corporation. All rights reserved.