Hobby Income

Hobby income is income from an activity that the IRS classifies under Internal Revenue Code section 183 as "not engaged in for profit." The classification has a sharp tax consequence: the income must be reported and is fully taxable, but because the activity is not a business, its expenses cannot be deducted against that income. So a person with a genuine hobby that happens to earn money pays tax on the money coming in without the offset a business would get for the money going out. The whole question in this area is therefore whether an activity is a business, whose net profit is taxed, or a hobby, whose gross income is taxed.

The line between a business and a hobby is drawn by whether the activity is carried on with an actual and honest objective of making a profit. The IRS does not decide this by the result but by a nine-factor test set out in Treasury Regulation section 1.183-2(b), which weighs things like whether the activity is conducted in a businesslike manner, the taxpayer's expertise, the time and effort put in, the history of income or losses, and whether the taxpayer depends on the income. No single factor controls, and the test looks at the whole picture.

There is also a presumption that helps. Under section 183(d), an activity is presumed to be engaged in for profit if it produced a profit in at least three of the last five consecutive years, or two of the last seven for activities involving horses. Clearing that bar shifts the burden to the IRS to show the activity is a hobby; failing it does not automatically make the activity a hobby, but it removes the presumption and leaves the nine factors to decide.

What makes the hobby classification costly is the treatment of expenses. Hobby income is reported as other income on the taxpayer's return, while hobby expenses are miscellaneous itemized deductions, and the deduction for miscellaneous itemized expenses is suspended under section 67 of the tax code, a suspension the 2025 tax law made permanent rather than letting it expire. The practical result is that a hobbyist owes tax on the full amount earned with no deduction for the costs of earning it. Someone whose side activity spends nearly as much as it brings in can end up taxed on income they did not really keep, which is why the business-versus-hobby determination is worth getting right rather than leaving to chance.

Suppose someone earns money from an activity the IRS would treat as a hobby, using hypothetical numbers. Over the year the activity brings in $3,000 and costs $2,000 in materials and supplies. Because it is a hobby, the full $3,000 is reported as other income and taxed, while the $2,000 of expenses is not deductible. The person is taxed on $3,000 even though only $1,000 was really left over.

Now suppose the same activity qualified as a business, carried on with a genuine profit motive. The $3,000 of income and the $2,000 of expenses would both go on a Schedule C, and only the $1,000 of net profit would be taxed, and that profit would also be subject to self-employment tax. The difference, being taxed on $3,000 versus $1,000, is exactly what the hobby-versus-business determination decides, and it is why the profit-motive factors and the three-of-five-years presumption matter.

This weighs hobby versus business classification, since that is the real choice a taxpayer's facts drive toward.

If the activity is a hobby

• No self-employment tax is owed on the income.
• But the income is taxed in full with no deduction for the expenses of earning it.
• Losses cannot be used to offset other income.

If the activity is a business

• Expenses are deductible, so only net profit is taxed.
• A genuine loss can offset other income.
• But net profit is subject to self-employment tax, and the activity must be carried on with a real profit motive, documented in a businesslike way.