What is hobby loss?

A hobby loss occurs when an activity not engaged in for profit generates losses, which cannot be deducted against other income under IRS rules that distinguish hobbies from legitimate businesses. For professional service firm owners with side activities, hobby loss rules can disallow losses if the profit motive is not demonstrated.

Key characteristics

• Activity not for profit

• Losses not deductible

• Nine-factor IRS test

• Profit in 3 of 5 years presumption

• Applies to side businesses

• Audit risk for serial losses

Why it matters for professional service firms

Hobby losses cannot offset business or wage income. The IRS scrutinizes activities with repeated losses. Professional service firm owners with loss-generating side activities should document profit motive and business-like conduct to defend against hobby loss treatment.

Real-world example

Brian's photography side business lost money for 4 consecutive years ($8,000, $6,000, $4,000, $5,000). IRS audit: examined profit motive. Brian documented: marketing efforts, pricing adjustments, industry education, and business plan. While not profitable yet, it has demonstrated genuine profit intent and business conduct. Losses allowed. Without documentation, likely hobby loss disallowance.