What worksheets are used to determine federal tax deductions?

Form 1040, Schedule A is required to claim itemized federal income tax deductions, according to Internal Revenue Service Tax Topic 501. Taxpayers who prefer to take the standard annual deduction on Form 1040, 1040A or 1040EZ do not have to attach Schedule A.

Use the first section of Schedule A to list medical and dental expense deductions that exceed the minimum adjusted gross income threshold, advises the IRS. Report deductible taxes, such as property tax or state sales tax, in the second section. Schedule A of Form 1040 also includes areas to report qualifying charitable contributions, interest paid and business-related deductions, such as unreimbursed travel expenses, uniforms and union dues.