Hobby vs. Business: How the IRS Decides Under IRC 183 and What It Costs You

By Yarik Yarosh, CPA ·September 5, 2026 ·6 min read

Written by Yarik Yarosh, CPA (US & Canada) September 5, 2026 · FL CPA license AC61704 · CPA Ontario

The hobby loss rules under IRC 183 create one of the worst tax outcomes possible: the income from the activity is fully taxable, but the expenses produce zero deduction. Before the TCJA, hobby expenses were at least partially deductible as miscellaneous itemized deductions (subject to the 2% AGI floor). After the TCJA eliminated that deduction category through 2025 (and the OBBBA did not restore it), hobby expenses became completely non-deductible. For a small business owner whose side activity is reclassified as a hobby, this means paying tax on the gross income with no offset for the costs of generating that income. The IRS applies a 9-factor test from Treas. Reg. 1.183-2(b) to determine profit motive, and no single factor is decisive. Activities that commonly face hobby challenges include farming (small scale), horse breeding, art and photography, writing and blogging, crafts (Etsy sellers), car racing, real estate flipping (small scale), and dog breeding.

✓Key takeaway

The 9-factor profit motive test (Treas. Reg. 1.183-2(b)):

Factor	Favors Business	Favors Hobby
1. Manner carried on	Separate books, business bank account, business plan, professional advisors	No records, commingled funds, no plan
2. Expertise	Owner has expertise or consults experts; changes methods to improve profitability	No expertise; doesn’t seek advice
3. Time and effort	Significant time devoted; owner manages personally	Minimal time; delegated to others while owner pursues other career
4. Expectation of asset appreciation	Assets used in the activity are expected to appreciate	No appreciation expected; purely consumable expenses
5. Success in other activities	Owner has turned other activities profitable in the past	No history of converting activities to profit
6. History of income/losses	Losses are diminishing over time; losses are explainable (startup phase, unusual events)	Persistent losses with no improvement trend
7. Occasional profits	Some profitable years, even if small; ratio of profits to losses is meaningful	Never profitable; no prospect of profitability
8. Financial status	Owner depends on the activity for livelihood; no other significant income source	Owner has substantial income from other sources (suggests losses are used as tax shelter)
9. Personal pleasure	Activity is not inherently recreational	Activity involves horses, boats, planes, travel, art, or other personal enjoyment

3-of-5 year presumption (IRC 183(d)):

Rule	Details
General	Profit in 3 of the prior 5 years creates a rebuttable presumption of profit motive
Horse activities	Profit in 2 of the prior 7 years
Effect	Shifts the burden of proof to the IRS (IRS must prove it’s a hobby)
Without presumption	Taxpayer must prove profit motive
Not automatic	Even with the presumption, the IRS can still challenge if other factors weigh heavily toward hobby

Tax consequences of hobby classification (post-TCJA):

Item	Business Treatment	Hobby Treatment
Income	Taxable (Schedule C)	Taxable (other income, line 8j of Schedule 1)
Expenses	Deductible against income	NOT deductible (0%, through 2025 and beyond under OBBBA)
Losses	Deductible against other income (subject to other limits)	NOT deductible
Self-employment tax	Yes (on net profit)	No SE tax (but also no loss deduction)
QBI deduction	Available (20% of qualified business income)	Not available

How does hobby classification destroy a tax position?

Hypothetical example

Round numbers. A taxpayer with $200,000 W-2 income operates a small horse boarding and training operation that has lost money for 4 consecutive years.

The activity’s financials:

Year	Revenue	Expenses	Net
2021	$30,000	$60,000	($30,000)
2022	$35,000	$65,000	($30,000)
2023	$40,000	$70,000	($30,000)
2024	$38,000	$68,000	($30,000)
2025	$45,000	$75,000	($30,000)

If treated as a business (Schedule C):

Item	Amount
W-2 income	$200,000
Schedule C loss	($30,000)
Adjusted gross income	$170,000
Tax savings from business loss ($30,000 x 37%)	$11,100

If reclassified as a hobby:

Item	Amount
W-2 income	$200,000
Hobby income (reported on line 8j)	$45,000
Hobby expenses	$0 (NOT deductible)
Adjusted gross income	$245,000
Tax on $45,000 hobby income ($45,000 x 37%)	$16,650

Total tax impact of reclassification:

Metric	Business	Hobby	Difference
AGI	$170,000	$245,000	$75,000 higher
Tax on activity	($11,100) savings	$16,650 cost	$27,750 worse
SE tax	($2,295) (loss reduces SE income)	$0
Net annual tax cost of hobby status			~$27,750

Over 5 years, hobby classification costs the taxpayer approximately $138,750 in additional taxes.

How to strengthen a profit-motive case:

Action	Which Factor It Supports
Maintain separate business bank account and books	Factor 1 (businesslike manner)
Write a formal business plan with profit projections	Factor 1
Hire an accountant and industry consultant	Factor 2 (expertise)
Work substantial hours in the activity	Factor 3 (time and effort)
Document changes in operations to improve profitability	Factor 2 + Factor 6
Show a profit in at least 3 of 5 years (even small)	Factor 7 + presumption
Document asset appreciation (land, animals, inventory)	Factor 4
Reduce personal enjoyment elements (or document that they’re incidental)	Factor 9
Cut losses that show no path to profitability	Factor 6
Keep detailed records of market research and pricing analysis	Factor 1 + Factor 2

IRC 183(e) election to postpone determination: A taxpayer can elect under IRC 183(e) to postpone the hobby/business determination until after the 5th year (or 7th year for horses) to see if the 3-of-5 presumption is met. During the postponement, the statute of limitations is held open.

Election	Effect
File Form 5213 within 3 years of the return due date for the first year of the activity	IRS waits until after 5 (or 7) years to challenge
Risk	Opens all years to audit; IRS may scrutinize more aggressively
Benefit	Allows time to achieve the 3-of-5 presumption
Recommendation	Generally NOT recommended; it invites IRS attention

Common activities challenged as hobbies:

Activity	Why It’s Targeted
Horse breeding/boarding	High personal enjoyment + persistent losses
Photography/art	Often a side passion; losses used to offset W-2 income
Farming (small-scale)	“Gentleman farmer” archetype
Writing/blogging	Low revenue relative to effort; often a personal interest
Car racing/restoration	Expensive hobby with occasional sales
Crafts/Etsy shops	Low volume, persistent losses
Dog breeding	Personal enjoyment + losses
Rental vacation homes (with personal use)	Mixed personal/business use
YouTube/social media	Growing area; many claim losses without significant revenue

Illustrative numbers only, not a real client and not advice for your facts.

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Cite this page

Yarik Yarosh, CPA. "Hobby vs. Business: How the IRS Decides Under IRC 183 and What It Costs You." Blue Cloud CPA, September 5, 2026. https://bluecloudcpa.com/guides/small-business-hobby-vs-business-irc-183-profit-motive-test

This guide is general information, not tax advice for your specific situation. Which points apply, and how, depends on your facts.