The editorial notes that we are No. 1 in the nation in the percentage of filers who itemize (45.9 percent). With the proposed doubling of the federal standard deduction, many fewer Marylanders will continue itemize — but will get “whacked” on their state income taxes as a result. Why? Maryland taxpayers who don’t itemize deductions on their federal returns are limited to a standard deduction on their state returns (of just $2,000 for singles and $4,000 for couples). So a couple earning $100,000 who currently can claim a federal deduction of, say, $23,000 now get a deduction on their state return of nearly that much (reduced by state taxes already paid).