All tax practitioners are aware how unyielding the tax code can be to those who lack sufficient planning and learn of the law’s arcane requirements only after the fact. One recent tax court case re-affirming this lesson is Williams v. Commissioner, TC Memo 2014-158 (August 2014), where a taxpayer lost out on deductions from his aircraft business due to his failure to provide the court with sufficient proof of his day-to-day work.
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