Last updated: May 19, 2026
You love photography, so you start selling a few prints. Or you've trained dogs for years and decide to take on paying clients. The income feels good, and the expenses feel even better, because a new camera, a website, some travel, and equipment all seem deductible.
Then tax season arrives and it gets murkier. Can you actually write those costs off? Can a loss from this activity lower the tax on your day-job income? Or is the IRS going to call the whole thing a hobby and leave you with taxable income and no deductions?
The distinction isn't academic. For a Houston-area business owner, or someone thinking about becoming one, getting it wrong means overpaying tax, risking an audit, or both. And the fix is not what most people assume. Forming a corporation or LLC does not automatically turn a hobby into a business.
Why the line between hobby and business matters
A real business can deduct ordinary and necessary expenses against its income. If expenses exceed income, that net loss can often offset other income on your return, subject to the basis, at-risk, and passive-activity limits. Running a genuine business also opens the door to retirement plan contributions and the qualified business income deduction, plus the clean recordkeeping that supports growth.
A hobby is treated very differently. You still report every dollar of income, but under current rules most hobby expenses are not deductible, and you cannot use a hobby loss to shelter W-2 wages, investment income, or other business profits. The result is simple and painful: you pay tax on the gross receipts with almost nothing to offset them.
That asymmetry is exactly why the IRS pays attention. Activities that look recreational, produce years of losses, and get deducted against other income are classic audit targets. The agency isn't trying to kill side projects. It's trying to stop people from treating personal recreation as a tax shelter.
The nine factors the IRS actually uses
The tax code doesn't give a single bright-line test. Instead, Treasury regulations list nine factors that the IRS and the courts weigh together. No single factor decides it. What counts is the overall picture of whether you have a genuine profit motive.
Here's how the factors tend to break down in practice:
| Factor | Points toward business | Points toward hobby |
|---|---|---|
| Manner of operation | Separate bank account, books, invoices, a business plan, insurance | Casual records, mixed personal and business spending, no formal tracking |
| Expertise | You or your advisors have relevant knowledge and apply it | You rely mainly on personal interest with little study or professional input |
| Time and effort | Substantial hours, especially if the activity has limited recreational appeal | Occasional effort that fits around leisure |
| Expectation of asset appreciation | Land, equipment, or inventory that can rise in value | Assets held mainly for personal use or enjoyment |
| Success in similar activities | A track record of making activities profitable | No history of successful ventures in related fields |
| History of income or losses | Occasional profits, or losses limited to a normal start-up period | Continuous losses with no realistic path to profit |
| Amount of occasional profits | Profits that are meaningful relative to losses and investment | Tiny profits that never cover the scale of expenses |
| Financial status of the taxpayer | You rely on the activity for a livelihood or real income | Substantial other income that makes the losses comfortable |
| Elements of personal pleasure | Little recreational value beyond the chance of profit | Strong personal enjoyment, social elements, or lifestyle benefits |
The IRS and the Tax Court look at the whole set, not any one line. A photography side hustle that keeps clean books, advertises, prices work to cover costs plus a margin, and shows a profit in three of the last five years will usually survive scrutiny. The same activity run off a personal laptop with no separate records, no marketing, and five straight years of losses will not.
The 3-of-5 profit presumption
There's one useful safe harbor. If an activity shows a profit in at least three of the five consecutive years ending with the year in question, the IRS generally presumes it's engaged in for profit. For breeding, training, showing, or racing horses, the test is two profitable years out of seven.
The presumption is rebuttable. The IRS can still argue the profits were engineered or that other factors overwhelm the numbers. But in ordinary cases it shifts the burden and makes an audit less likely. Plenty of owners deliberately manage the timing of income and expenses in the early years to hit the three-of-five mark once the activity stabilizes.
If you're still in the start-up phase and losses are expected, document why. Industry norms, market conditions, an equipment ramp-up, and the time it takes to build a client base all matter. A vague hope that "it'll turn around someday" does not.
What happens if the IRS calls it a hobby
When an activity is reclassified as not-for-profit, a few things follow. You still have to report all of the gross income. Most related expenses become non-deductible. Any losses you previously claimed against other income can be disallowed, which produces additional tax, interest, and possibly penalties. And the same limitation applies to individuals, partnerships, estates, trusts, and S corporations alike.
Cost of goods sold is generally still allowed when you sell tangible products. Nearly everything else, including marketing, travel, equipment beyond COGS, and a home office, is usually off the table for a pure hobby.
This is why the old advice to "just deduct the expenses up to the amount of hobby income" no longer works the way it once did. The miscellaneous itemized deduction that used to allow limited hobby expense write-offs has been eliminated. The practical outcome in 2026 is that hobby income is taxable and hobby expenses, for the most part, are not.
Incorporating your hobby doesn't fix it
A common misconception is that forming an LLC or corporation magically converts a hobby into a business. It doesn't.
The not-for-profit rules look at the nature of the activity and the taxpayer's profit motive, not at the legal wrapper around it. Courts have repeatedly held that running a money-losing recreational activity inside a corporation does not create deductible losses for the owner. In some cases, the corporation paying the owner's personal expenses has been treated as a constructive dividend to the shareholder, meaning taxable income with no matching deduction. A federal appellate court reached exactly that result: the net losses weren't deductible, and the owner ended up with dividend income based on what the corporation spent on the activity.
An S corporation is specifically covered by the same limitation that applies to individuals. A C corporation follows different rules, but that structure carries its own double-tax cost and is rarely the right answer for a small side activity still trying to prove it's a business.
Entity choice does matter once you have a genuine profit motive. An LLC taxed as a sole proprietorship, partnership, or S corporation can provide liability protection and cleaner reporting. But the entity is the second step, not the first. First you have to operate like a business.
How to build a real profit motive without losing the fun
If you intend to treat the activity as a business, the practical steps are straightforward:
- Open a separate business bank account and keep personal spending out of it.
- Keep accurate books, ideally in the same cloud system you'll use as the company grows.
- Write a simple business plan covering pricing, target customers, and a path to profit.
- Market the activity the way a comparable commercial operation would.
- Track your time and results so you can show the effort you're putting in.
- Price your work to cover costs and earn a reasonable return once the start-up phase ends.
- Talk to someone who understands both your industry and the tax rules, so decisions are informed rather than hopeful.
None of these require you to stop enjoying the work. They just require you to treat it with the same seriousness you'd bring to any other business you expect to survive.
Local factors matter too. Texas has no state income tax, but federal self-employment tax, franchise tax thresholds, and sales-tax collection obligations still apply once the activity crosses into business territory. Getting the classification right early avoids a messy catch-up later.
Not sure if your side income is a hobby or a business?
We'll review your activity against the nine IRS factors and help you set it up so the deductions actually hold up.
The Bottom Line
The IRS doesn't care whether you love the work. It cares whether you're trying to make money from it in a businesslike way. The nine factors, the three-of-five presumption, and the hard limit on hobby losses all exist to draw that line.
If your side activity is truly a hobby, enjoy it and stop claiming losses against other income. If you want the tax treatment of a business, operate like one: separate books, realistic pricing, marketing, and a credible path to profit. Forming an entity can help once that foundation exists, but it won't manufacture a profit motive that isn't already there.
If you're not sure which side of the line your activity falls on, or you want to set it up correctly from the start, that's a quick conversation with a CPA that can save you an audit later. It's part of what our team handles in year-round tax planning for Houston-area owners.
