The following article was published by the IRS.
You must report on your tax return the income you earn from a hobby. The rules for how you report the income and expenses depend on whether the activity is a hobby or a business. There are special rules and limits for deductions you can claim for a hobby. Here are four tax tips you should know about hobbies:
1. Is it a Business or a Hobby? A key feature of a business is that you do it to make a profit. You often engage in a hobby for sport or recreation, not to make a profit. You should consider nine factors when you determine whether your activity is a hobby. Make sure to base your determination on all the facts and circumstances of your situation. For more about ‘not-for-profit’ rules see Publication 535, Business Expenses.
2. Allowable Hobby Deductions. Within certain limits, you can usually deduct ordinary and necessary hobby expenses. An ordinary expense is one that is common and accepted for the activity. A necessary expense is one that is appropriate for the activity.
3. Limits on Hobby Expenses. Generally, you can only deduct your hobby expenses up to the amount of hobby income. If your hobby expenses are more than your hobby income, you have a loss from the activity. You can’t deduct the loss from your other income.
4. How to Deduct Hobby Expenses. You must itemize deductions on your tax return in order to deduct hobby expenses. Your expenses may fall into three types of deductions, and special rules apply to each type. See of Publication 535 for the rules about how you claim them on Schedule A, Itemized Deductions.