Major Defeat Dealt to States Seeking to Apportion Income Using the "Operational Function Test"

The U.S. Supreme Court issued a very interesting ruling affirming its earlier decisions related to the taxation of "unitary businesses".  (See MeadWestvaco Corp. v. Illinois Department of Revenue, U.S. Supreme Court, Dkt. 06-1413, vacating the Illinois Appellate Court, April 15, 2008).

In this case, Mead had sold Lexis-Nexis for a $1Billion gain. That gain was allocated to Ohio by Mead. Illinois audited them and took the position that the gain should have been apportioned to IL. IL made the argument at the trial court (which agreed with the State) that although the businesses weren't unitary, the asset (Lexis-Nexis) was used in an "operational function", it should be apportioned. This "operational function" concept has arisen in a couple of recent US Supreme decisions. It has apparently given the states the idea that there is no such thing as allocable income anymore because all they have to do is argue that the asset involved was used in an operation function and they can apportion it. Of course, only the extraterritorial states want to make this argument. But the Supremes in this case, say the IL court erred in their interpretation of this test. See below for their commentary:

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