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Understanding what qualifies as a legitimate tax deduction — and what doesn’t — can help side hustlers avoid costly mistakes, reduce audit risk and keep more of their hard-earned income.

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A 2024 report from McKinsey & Company found that 36% of employed Americans — roughly 58 million people — identify as independent workers, with many using side hustles to supplement their primary income. When you’re building something on the side — whether it’s freelance coding, selling vintage finds or coaching clients — every dollar of revenue feels hard-won. So when tax season arrives, the real question isn’t just how much you made, but how much you get to keep.