How will the new tax law affect state income taxes? The Tax Cuts and Jobs Act, signed into law on Dec. 22, 2017, is a major revamping of federal taxes but it also could have sweeping effects on your state taxes. To name a few, most states use the federal system to calculate state taxable income, so you may see your state income tax liability change. New limits on the federal state and local tax deduction may indirectly impact individuals at the state level, especially in high tax areas. States will have to decide whether to conform with new federal tax rules.
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