Many, but not all, individuals will see their tax bills decline starting in 2018. Tax rates are reduced and the standard deduction is nearly doubled. It is expected that taxpayers will begin to see the benefit in their paychecks starting in February 2018 (employees likely will be required to complete a revised Form W-4 that is not yet available). An explanation of various provisions will be provided in upcoming posts.
On Form 1040X, you may file an amended return within a three-year period to claim a refund or correct a mistake made on an original or previously amended return.