The IRS draws a strict line between hobby income and self-employment income, and that distinction affects your tax bill.
If the IRS classifies your side activity as a hobby, you cannot deduct expenses against the income. You must report all revenue as gross income on your tax return. This applies even if you spent $5,000 on supplies and equipment to generate $6,000 in hobby earnings. You owe taxes on the full $6,000.
Self-employment income works differently. If the IRS recognizes your side work as a legitimate business, you can deduct all ordinary and necessary business expenses. That same $6,000 in revenue, with $5,000 in expenses, becomes $1,000 in taxable net income.
The IRS uses a profit motive test to decide. The agency looks for evidence that you operate with the intent to make money. Key factors include whether you keep detailed records, maintain a separate business bank account, advertise your services, and earn a profit in at least three of five consecutive years. Side hustles that consistently lose money face hobby reclassification.
This matters because hobby losses cannot offset other income. If you freelance as a photographer and lose $2,000 in a tax year, you cannot deduct that loss against your W-2 wages. A recognized business lets you claim those losses against other earnings.
Documentation protects you. Keep records of all revenue and expenses. Track hours worked. Save receipts and invoices. File Schedule C (self-employment income) rather than Schedule 1 (other income) to demonstrate business intent.
The tax code does not require you to earn a profit every year to qualify as a business. However, the IRS grows skeptical of activities that generate losses year after year. Hobbies like art, writing, or photography face particular scrutiny because many people pursue them