When you itemize federal taxes, you can deduct up to $10,000 in state taxes (either income or sales, but not both). Since it is difficult to get up to $10,000 in sales taxes but not that difficult to reach $10,000 in income taxes, then most people who itemize will end up paying higher in federal taxes.
When you itemize federal taxes, you can deduct up to $10,000 in state taxes (either income or sales, but not both). Since it is difficult to get up to $10,000 in sales taxes but not that difficult to reach $10,000 in income taxes, then most people who itemize will end up paying higher in federal taxes.