Under pre-Act law, taxpayers were allowed to deduct certain miscellaneous itemized deductions to the extent they exceeded, in the aggregate, 2% of the taxpayer's adjusted gross income.

New law. For tax years beginning after Dec. 31, 2017 and before Jan. 1, 2026, the deduction for miscellaneous itemized deductions that are subject to the 2% floor is suspended. This includes the deduction for tax preparation expenses.