When Does a Side Hustle Become a Business? IRS Rules for Hobby vs. Business Income

You started selling things on Etsy. Or freelancing on the side. Or doing photography on weekends. It started as extra income, but now it’s generating real money. At some point, the IRS stops treating that activity as a hobby and starts treating it as a business — and the tax consequences of that distinction are significant.

Here’s how the IRS draws the line, what factors they look at, and why getting this right matters for your deductions and your liability.

Why the Distinction Matters

If your activity is a business, you report income and expenses on Schedule C. You can deduct ordinary and necessary business expenses against that income. If expenses exceed income, you can report a loss that reduces your other taxable income (subject to certain limitations).

If your activity is a hobby, you still report the income — but under current law, you cannot deduct hobby expenses. The Tax Cuts and Jobs Act eliminated the miscellaneous itemized deduction for hobby expenses through 2025, and the OBBBA extended this treatment. That means hobby income is fully taxable with no offsetting deductions. The difference can be thousands of dollars.

How the IRS Decides: The Nine-Factor Test

The IRS uses a nine-factor test under IRC Section 183 and Treasury Regulation 1.183-2 to determine whether an activity is engaged in for profit. No single factor is determinative — the

IRS weighs all of them based on the specific facts:

• The manner in which you carry on the activity (do you keep books, have a separate bank account, maintain business records?)

• Your expertise or the expertise of your advisors

• The time and effort you devote to the activity

• Whether you expect the assets used in the activity to appreciate

• Your success in similar or related activities

• Your history of income or losses from the activity

• The amount of occasional profits, if any

• Your financial status (do you have other income sources?)

• Whether the activity has elements of personal pleasure or recreation

The Presumption of Profit

There’s a rebuttable presumption under Section 183(d) that an activity is a business if it shows a profit in at least three of the last five tax years (two of seven for horse-related activities). If your side hustle has been profitable in three of the last five years, the IRS presumes you’re operating it for profit — and the burden shifts to them to prove otherwise.

If your activity doesn’t meet this threshold, it doesn’t automatically mean it’s a hobby. It just means the burden is on you to demonstrate profit intent using the nine factors above.

What Actually Protects You

The best protection against an IRS hobby loss challenge is running your activity like a business — because that’s exactly what the nine-factor test measures. Keep separate books. Maintain a business bank account. Track income and expenses. Document your marketing efforts and business development. Show a business plan or strategy for profitability, even if you’re not there yet.

If the IRS ever questions whether your activity is a business, those records are what you’ll point to. Without them, you’re relying on your word against the IRS’s analysis — and the IRS has the nine factors on their side.

When to Formalize Your Side Hustle

If you’re generating consistent income from an activity and you intend to grow it, treat it as a business from the start. Open a business bank account. Set up basic bookkeeping. File the appropriate tax schedules. The cost of setting up properly is minimal compared to the cost of losing deductions because the IRS reclassifies your business as a hobby.

---

If you’re not sure whether your side income should be reported as a business or how to structure it properly, schedule a consultation. We can help you evaluate the right structure and get your books set up from the beginning. See our federal tax preparation services and bookkeeping system setup.