Here’s a wonkish comment about a US Supreme Court decision that heralds the death of Chevron deference.
BNSF Railway v. Loos (US Supreme Ct 03/04/2019) [PDF] was a boring case about payroll taxes in the railway industry.
The 7-Justice opinion for the Court was important for what it did not say.
The case involved interpretation of a tax statute. And the IRS had issued a regulation interpreting that statute. You would think the Court would have dealt with what's called Chevron deference – named after Chevron U. S. A. Inc. v. Natural Resources Defense Council, Inc., 467 U. S. 837 (1984). When an administrative agency interprets an ambiguous statute, Chevron says that courts should defer to that interpretation.
But the Court Did. Not. Even. Mention. Chevron.
So the death of Chevron deference was announced on March 4, 2019.