I don't think you get my point. Let's say two people living in two different states have a state/local tax burden of $10,000. In state A, the breakdown is $5,000 in state income tax, $3,000 in property tax and $2,000 in sales tax. In state B, the breakdown is $5,000 in property tax and $5,000 in sales tax and there is no income tax.
The resident of state B gets to deduct 100% of the tax burden from the federal tax return. The resident of state A gets to deduct either $8,000 (income + property) or $5,000 (sales + property), but cannot deduct the entire $10,000.
NOT FAIR!
Apologies! You're right, of course. I had meant to reply to those who didn't realize it applied to all states.
Of course, all taxes should be deductible from Feds, but then does that just encourage further state taxation?