People could claim a deduction for their state property tax on their federal income tax forms. Now, they can only claim up to $10,000.00. They pay more income tax now because they can't claim all of their property tax.
Your deduction of state and local income, sales, and property taxes is limited to a combined total deduction of $10,000.
So if you itemize (like me) and your state taxes are more than 10k (like me). You don't get to deduct them all.