A panel of the D.C. Circuit ruled today that the IRS is not free to rewrite the ObamaCare statute to extend tax credits from users of state-run health exchanges, as per the law’s language, to users of the federal exchange as well, because the federal government is not a “State.” [Halbig v. Burwell; Ilya Shapiro, Cato] Later today, a panel of the Fourth Circuit ruled that yes, it’s free to do so. [King v. Burwell] Given the instant one-day circuit split and the importance of the issue, further court consideration is inevitable, and the Obama administration has already indicated that it will seek en banc consideration by the full D.C. Circuit, packed with its own recent appointees. More: The work of my Cato colleague Michael Cannon and Case Western lawprof Jonathan Adler helped undergird the suit; Cannon has commentary here and here and Adler here and here.