Margin Interest: Tax Deductibility and Net Investment Income Limits
An investor incurs $6,000 in margin interest expense on funds borrowed to purchase dividend-paying corporate equities in a margin account. The investor earns $4,000 in taxable dividend income during the tax year. For federal income tax purposes, how much of the margin interest is deductible under IRS rules?
Margin interest is deductible as investment interest expense, but ONLY up to the taxpayer's Net Investment Income ($4,000). The disallowed excess ($2,000) carries forward indefinitely.
Complete Analysis & Legal Rationale
Under IRC Section 163(d), investment interest expense (including margin loan interest) is deductible by individual taxpayers who itemize deductions, but the deduction is strictly capped at the taxpayer's Net Investment Income (dividends, taxable interest, short-term gains). Here, net investment income is $4,000, so $4,000 of margin interest is deductible this year. The excess $2,000 cannot offset wages but carries forward indefinitely to offset future investment income.
Distractor Autopsy (Why Other Options Are Traps)
FINRA exam writers design incorrect distractors using specific calculation mistakes and regulatory misconceptions. Review why each option succeeds or fails:
Margin interest is deductible as investment interest expense, but ONLY up to the taxpayer's Net Investment Income ($4,000). The disallowed excess ($2,000) carries forward indefinitely.
Fails to adhere to margin rules for B.
Fails to adhere to margin rules for C.
Fails to adhere to margin rules for D.
Official Standard: Under IRC Section 163(d), investment interest expense (including margin loan interest) is deductible by individual taxpayers who itemize deductions, b