Constantine Johnny / Getty Images Schedule A (Form 1040 or 1040-SR): Itemized Deductions is an Internal Revenue Service (IRS) form for U.S. taxpayers who itemize their tax-deductible expenses ...

You can think of the 1040 like a math worksheet: You plug in various numbers from a schedule (Form 1040 will tell you which one to use) and add the schedules' totals to your Form 1040. Form 1040 ...