“Suing on the basis that full state and local taxes have been fully deductible since the very beginning of the federal income tax more than 100 years ago.”
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Sorry, NOT always fully deductible. The AMT regularly has limited the deductibility of SALT payments. Using TurboTax software I computed my taxes NOT prepaying 2018’s property taxes and then ran the software again deducting prepayment of 2018 taxes. My federal tax remained the same (despite having substantially higher SALT) since the AMT amount of taxes is computed without deducting SALT.
This lawsuit is merely a political stunt and will not succeed. MAGA!
OK, should have noted the AMT (and other AGI related limitations on deductions in general) in my post.
But there has never been an arbitrary one-size-doesn’t-fit-all fixed dollar cap placed on SALT—until now.