Hobby or Business? The IRS Section 183 Nine-Factor Test for 2026

Imagine spending $30,000 on equipment, training, and supplies for your photography side gig last year. You earned $8,000 in revenue. You deduct the $22,000 net loss against your day-job salary, expecting a refund. Eighteen months later, an IRS examiner sends a Notice of Proposed Adjustment: your photography activity is a hobby, not a business. The losses are disallowed. You owe back taxes, interest, and a 20% accuracy-related penalty.

This is the world that Internal Revenue Code Section 183 governs — the so-called "hobby loss rules" that decide whether the IRS will let you treat a money-losing activity as a deductible business or as a personal pursuit you happen to earn a little money from. And after the One Big Beautiful Bill Act (OBBBA) made the elimination of miscellaneous itemized deductions permanent, the stakes have never been higher. If your activity gets reclassified as a hobby in 2026, you typically owe tax on every dollar of revenue with essentially no offset for the expenses you incurred to earn it.

This guide walks through the nine-factor test the IRS and Tax Court actually apply, the safe-harbor presumption that can save you, what recent cases like Young v. Commissioner (2025) reveal about how courts decide these disputes, and the records you need to keep so you don't end up arguing with an examiner who already thinks you're an enthusiast pretending to be an entrepreneur.

Why This Matters More in 2026 Than Ever Before

Before 2018, hobby classification was painful but bearable. Hobby income was taxable, but you could deduct hobby expenses up to the amount of hobby income as a miscellaneous itemized deduction subject to a 2% adjusted gross income (AGI) floor. You couldn't generate a tax loss, but you could at least zero out the income.

The Tax Cuts and Jobs Act of 2017 suspended miscellaneous itemized deductions for tax years 2018 through 2025. The OBBBA, enacted in 2025, made that suspension permanent. The practical result for 2026 and beyond: if your activity is classified as a hobby, you report 100% of gross receipts as taxable "other income" on Schedule 1, Line 8 — and you generally cannot deduct the expenses you incurred to earn that income. Cost of goods sold for inventory you actually sold remains netted against gross receipts (it isn't technically a deduction), but the rest — mileage, supplies, equipment, software, advertising, training — disappears.

That asymmetry is brutal. A photographer who earns $8,000 of hobby income and spent $30,000 on the activity owes tax on the full $8,000. A side-hustler who runs the same activity as a legitimate business owes tax on $0 and also gets to apply the $22,000 loss against other income (subject to passive-activity and excess-business-loss rules).

So the line between hobby and business is not academic. It's the line between losing money and losing money plus a tax bill.

The Statutory Framework: Section 183 and the "Engaged in for Profit" Test

Section 183 disallows deductions attributable to "activities not engaged in for profit." The legal question is whether you carry on the activity with an "actual and honest objective of making a profit." Profit means tax profit — gross income exceeding deductions — not just personal satisfaction or eventual asset appreciation.

The Section 183 regulations, codified at Treas. Reg. § 1.183-2(b), articulate nine non-exclusive factors that courts and examiners weigh together. No single factor is decisive, and the analysis turns on the totality of facts and circumstances. The IRS's public-facing guidance reorganizes these into a slightly longer checklist, but the substance is the same.

The Nine Factors, Translated for Real People

1. The manner in which you carry on the activity

Do you operate in a businesslike fashion? Separate bank account, dedicated credit card, bookkeeping software, written invoices, contracts, a business plan, periodic financial reviews, and a recordkeeping system that actually reflects what's happening — these are the artifacts of a profit-seeking enterprise. Mixing personal and business expenses on a single Visa card and "doing the books" by stuffing receipts in a shoebox is the most common factor that sinks taxpayers in court.

2. The expertise of the taxpayer or advisers

Did you study the field before jumping in? Do you consult with experienced practitioners, take continuing education, read trade publications, or hire advisers when you lack expertise yourself? If you bought a vineyard and have never read a book about viticulture or asked a single grower a question, the IRS will notice.

3. The time and effort you spend

Hours matter, especially during weekday business hours. A taxpayer who spends 15 hours a week on the activity year-round looks very different from one who works on it occasionally over weekends. Time on activities you obviously enjoy (riding horses, fishing, photography of family events) is sometimes discounted; time on the unglamorous parts of the operation (bookkeeping, marketing, equipment maintenance, customer service) is heavily favorable.

4. Expectation that assets used in the activity will appreciate

If you expect the underlying assets — land, breeding stock, intellectual property, a brand — to appreciate in value, that potential gain can substitute for current operating profit. This factor frequently rescues farming, ranching, and real-estate-adjacent activities that show recurring losses but rest on appreciating land.

5. Your success in similar or dissimilar activities

Have you previously taken an unprofitable enterprise and turned it around? A track record of building businesses — even in different industries — supports profit motive. A first-time entrepreneur isn't doomed by this factor, but a serial founder with multiple successful exits gets significant credit.

6. The history of income or losses

Startup losses are expected and treated favorably, especially when the activity has been operational for fewer than five years or when losses stem from circumstances beyond your control (drought, equipment failure, supply shocks, customer bankruptcy). Two decades of unbroken losses without meaningful operational changes is a red flag the size of a barn.

7. The amount of occasional profits, if any

Even small, occasional profits help — they show the activity is capable of producing income. The size of profits relative to total losses and your investment also matters. A single $5,000 profit year against $250,000 of cumulative losses doesn't carry much weight; consistent small profits with periodic loss years tells a different story.

8. Your financial status

If you have substantial income from other sources and the activity also gives you tax shelter benefits, the IRS scrutinizes more closely. This factor isn't decisive — many legitimate businesses are funded by founders with day jobs — but combined with personal-enjoyment factors, it can tip the analysis. Conversely, taxpayers who depend on the activity for their livelihood get the benefit of the doubt.

9. Elements of personal pleasure or recreation

The most subjective factor, and often the most damaging. Activities with intrinsic recreational appeal — horses, sailing, vintage cars, wine, hunting, photography, fishing, breeding pets — invite suspicion. Activities that are inherently grimy or tedious (waste hauling, commercial cleaning, accounting) get more deference. You don't have to hate what you do, but you have to demonstrate that profit, not enjoyment, is what keeps you doing it.

The Safe Harbor: Section 183(d)'s Three-Out-of-Five Rule

Section 183(d) gives taxpayers a presumption of profit motive if the activity has produced gross income exceeding deductions in three of the last five consecutive tax years (two of the last seven for activities involving horses). The presumption shifts the burden to the IRS to prove the activity isn't engaged in for profit.

A few important caveats:

• The presumption is rebuttable. Showing three profit years doesn't guarantee victory; the IRS can still argue the profits were manufactured, immaterial, or inconsistent with profit-seeking intent.
• "Profit" means tax profit, not cash profit. An activity that breaks even economically but books large depreciation deductions can still qualify.
• The presumption is a defense, not a sword. Failing to qualify doesn't mean you lose — the nine factors still apply, and many taxpayers win without ever hitting the safe harbor.

You can also file Form 5213 to elect to defer the IRS's hobby-loss determination until after the first five years (seven for horses) — useful for a genuine startup that knows early years will be unprofitable. The election extends the statute of limitations for the relevant years, so use it strategically.

What Recent Cases Tell Us

The Tax Court decided several Section 183 cases in 2025 that illustrate how the factors play out in practice.

Young v. Commissioner, T.C. Memo. 2025-95, involved Wesley and Janet Young's Pecandarosa Ranch in Oklahoma — a pecan farm that pivoted to horse training and event hosting. The activity sustained nearly $3 million in cumulative losses between 2008 and 2022. The court disallowed the losses and sustained 20% accuracy-related penalties. The decisive issues weren't the losses themselves but the absence of artifacts of a real business: no written business plan, no financial projections, no budgets, no documented strategic shifts to address recurring unprofitability, and recordkeeping the court characterized as inadequate. The Youngs argued sincere profit intent, but the court applied the regulations' factors and found the businesslike-conduct, expertise, and history-of-losses factors all weighed against them.

The lesson is straightforward: courts care less about your subjective state of mind than about the objective evidence you can put in front of them. A business plan you wrote yourself in a weekend is worth more than a decade of sincere belief without one.

How to Build the Record Before the IRS Asks

If you're running a side activity that loses money, treat the documentation problem as if you knew an audit was coming in three years. Specifically:

Open a separate bank account and credit card. This single step accomplishes two of the nine factors. Run every revenue dollar and every expense through dedicated accounts. Never reimburse yourself out of the business account for personal items.

Write a business plan, even a short one. Three to five pages covering market opportunity, target customers, pricing strategy, cost structure, projected path to profitability, and the milestones that would tell you the plan is or isn't working. Update it annually. Save dated drafts.

Keep contemporaneous records of time spent. A calendar or time log showing hours dedicated to the activity, broken down by type of work, is gold. Reconstruct-from-memory logs created during an audit have substantially less credibility.

Document operational changes. When something isn't working, write down what you tried, what the result was, and what you're changing. Pivoted from B2C to B2B? Raised prices? Cut a product line? Hired a contractor? Memorialize it in a note to file or a board-style minute.

Use real bookkeeping. Whether you use Beancount, QuickBooks, Xero, Wave, or a spreadsheet, the system needs to be able to produce a profit-and-loss statement, a balance sheet, and a list of every transaction with category. Annual reconciliations against your bank statements are non-negotiable.

Maintain customer-facing artifacts. Invoices, contracts, marketing materials, a website, email lists, a logo, business cards, social-media presence, listings on relevant platforms. The IRS examiner will ask whether you actually look like a business to your customers.

Get advice in writing. When you consult with a CPA, attorney, or industry expert, capture the engagement in writing. Email confirmations, engagement letters, written recommendations — these prove the "expertise" factor.

Mid-Article Reality Check: Bookkeeping Is the Single Highest-Leverage Defense

Of all nine factors, the businesslike-conduct factor is both the easiest to control and the one that most commonly decides cases. Two taxpayers can have identical activities, identical losses, and identical profit motives in their hearts. The one with clean monthly P&L statements, reconciled bank accounts, and a categorized general ledger wins. The one running everything off a personal checking account loses. The infrastructure is the argument.

This is why plain-text accounting tools like Beancount have become popular with side-business owners and serial founders — every transaction is recorded with a date, accounts, narration, and tags, the entire ledger is version-controlled in git, and reports are reproducible from source data years later. When an examiner asks "what did you spend on equipment in 2024," the answer is one query away. When they want to see how the activity's expense categories changed over time as you tried to improve profitability, that story is right there in the commit history.

What If You're Already Under Audit?

A few things to know if a Section 183 examination has already started:

Don't volunteer information. Answer what's asked, in writing, with documents that support your positions. Avoid free-form narrative explanations of your "passion" for the activity — they almost always hurt.

Reconstruct the record carefully and honestly. If you don't have time logs, you can sometimes piece them together from calendar entries, emails, and credit card records. Mark reconstructions as such; passing them off as contemporaneous is far worse than the original gap.

Engage a tax professional. Section 183 cases are facts-and-circumstances battles. An experienced tax controversy attorney or CPA who has handled hobby-loss exams will know which factors to lean into, which Tax Court cases match your facts, and when to push to Appeals versus settle.

Consider Appeals before docketing in Tax Court. The IRS Office of Appeals is independent of the examination function and is often willing to settle hobby-loss cases on a percentage basis (e.g., allowing 50% or 70% of disallowed losses) to avoid litigation hazards on both sides.

Don't ignore the penalty exposure. A 20% accuracy-related penalty under Section 6662 is on the table when losses are large or recurring. A reasonable-cause defense — reliance on a competent tax adviser, reasonable interpretation of the law — is sometimes available, but the standard is high.

Common Misconceptions Worth Killing

"I have an LLC, so I'm a business." Entity formation does not establish profit motive. The Section 183 analysis applies to LLCs, S corporations, sole proprietorships, and partnerships alike. An LLC organized for asset protection helps with liability, not with hobby-loss reclassification.

"I lose money in three years and I'm reclassified." The three-of-five rule is a presumption you can claim, not a cliff you fall off. Many businesses lose money for five, ten, or fifteen years and remain businesses; the question is whether the losses are consistent with profit-seeking intent and operational reality.

"As long as I don't deduct losses, the IRS doesn't care." True for the immediate year, but a hobby characterization in one year can cascade into adjustments to other years (especially via NOLs and carryforwards) and can affect related tax positions like self-employment tax and qualified business income deductions.

"My CPA does my taxes, so I'm fine." A CPA who hasn't asked you about your business records, financial projections, or operational metrics isn't building a Section 183 defense; they're filing returns. The defense is built in the way you run the activity, not in the return preparation.

A Decision Framework for Side-Activity Owners

Before the year ends, run through this short checklist for any activity that lost money:

1. Have I produced gross profit (income exceeding deductions) in three of the last five years? If not, am I within the first five years of operation?
2. Do I have a separate bank account, books, and an annual P&L?
3. Do I have a written business plan that has been updated within the last 12 months?
4. Can I produce a contemporaneous log of time spent on the activity this year?
5. Have I made and documented at least one substantive operational change in response to losses?
6. Have I consulted with at least one outside expert (CPA, industry adviser, mentor) about the activity, and is that consultation documented?
7. Are my customer-facing artifacts (invoices, contracts, website, marketing) consistent with a real business?

Three or more "no" answers means you have meaningful Section 183 exposure. The fix is operational, not cosmetic — you can't paper over a hobby in March.

Keep Your Side Activity Audit-Ready from Day One

Whether your photography, consulting, ranching, software, or trading activity ultimately produces a profit or a loss, the IRS will judge your profit motive on the records you can produce. Beancount.io gives you plain-text, version-controlled accounting that survives audits, scales from a side gig to a real company, and never traps your data behind a vendor's paywall. Every transaction has a date, accounts, narration, and tags; every report is reproducible from source data; every change is in git history. Get started for free and build the kind of records the Tax Court actually wants to see.