How the IRS Section 183 nine-factor test decides whether your side activity's losses are deductible in 2026, what the three-of-five safe harbor really means, and what 2025's Young v. Commissioner reveals about the records that win in Tax Court.
Section 183 of the Internal Revenue Code denies loss deductions for activities not engaged in for profit. The IRS applies a nine-factor test and a three-of-five-years safe harbor (two of seven for horses) to distinguish a real business from a hobby — here is what each factor weighs and how to document profit motive before an audit.
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