An overlooked byproduct of the Republicans tax law is that it will increase state taxes for many people. This is because many states require taxpayers to use the state standard deduction if they use the federal standard deduction. For people who itemize on their federal taxes, states often require an adjustment for state income taxes but allow the full deduction of state and local real estate and personal property taxes. Without compensating changes in state law, in 2018, the higher federal standard deduction and the $10,000 cap on SALT items will require the use of the lower state standard deduction or prevent the deduction of a portion of your real estate taxes. Either of these will increase a taxpayer’s state taxable income. State governments need to fix what otherwise would be a Republican state tax increase.