Margin interest may be deductible as investment interest. It is treated as an itemized deduction, subject to a net investment income limitation. Margin interest does not offset capital gains.
Items, such as interest, state and local income and sales taxes, charitable contributions, and medical deductions, claimed on Schedule A of Form 1040. Itemized deductions are subtracted from adjusted gross income to arrive at taxable income. The amount of itemized deductions is also subject to a reduction when adjusted gross income exceeds certain limits.