The Hobby-Loss Safe Harbor (Section 183)

How it works

Section 183(a) denies most deductions for an activity that is not engaged in for profit, which section 183(c) defines by exclusion: any activity other than one that would already qualify for a trade-or-business or income-producing deduction. Read together, section 183 is the backstop that enforces the ordinary profit-motive requirement, not a separate hobby standard layered on top of it.

That backstop role is why section 183 is the first gate every other loss-limitation rule sits behind: the at-risk rules, the passive-activity rules, the excess-business-loss cap, and net operating loss carryforwards all limit a loss that has already cleared section 183. An activity that never clears it never produces a loss for those rules to work on.

Three tiers, capped in order

When an activity is recharacterized as not for profit, section 183(b) still allows deductions in three tiers, each capped by whatever gross income is left after the tier before it.

• Tier one. Amounts the code would allow regardless of profit motive, mainly interest and state or local taxes tied specifically to the activity. Allowed in full, with no gross-income limit.
• Tier two. Ordinary operating expenses, supplies, insurance, advertising, and similar costs that do not affect the basis of any asset. Allowed only up to whatever gross income remains after tier one.
• Tier three. Depreciation and other basis-affecting amounts. Allowed only up to whatever is left after tiers one and two, apportioned across assets if more than one is involved.

Because each tier is capped by whatever gross income remains, an activity governed by section 183 can never show a net loss; the best it can do is break even. Nothing carries forward either: unlike the passive-activity rules, which suspend a disallowed loss and let it come back in a later year under section 469(b), a tier-two or tier-three amount that misses the gross-income cap in its own year is simply gone.

What losing the argument costs today

Losing the profit-motive fight used to be a haircut: the ordinary operating and depreciation amounts were lost above the line but could usually still be claimed as an itemized deduction. Two developments changed that, and they now compound each other. The first is Gregory v. Commissioner, where the Eleventh Circuit held that tier-two and tier-three amounts under section 183(b)(2) are miscellaneous itemized deductions under section 67(b), not an above-the-line offset against the activity's own income. The second is the fate of miscellaneous itemized deductions generally: Congress suspended the entire category for 2018 through 2025, and legislation enacted in 2025 struck the scheduled sunset before it took effect, making the suspension permanent for tax years beginning after 2025.

Together, a recharacterized hobby today keeps only tier one, and only if the taxpayer itemizes. Tier two and tier three are not reduced; they are worth zero, and the activity's gross income is still fully taxable. Losing this argument is not a smaller deduction; it is full taxation of the revenue with almost nothing left to offset it.

The Florida question

Florida has no individual income tax, so nothing about section 183 changes at the state level regardless of how the federal question comes out, and there is no separate Florida hobby-loss test to plan around. Gregory was decided by the Eleventh Circuit, Florida's own circuit, so its holding on tier-two and tier-three amounts is binding precedent on a Florida return, not a persuasive opinion from elsewhere.

Who this applies to

Section 183(a) reaches an individual or an S corporation by its own text. Treasury's regulations extend it to estates and trusts, because section 641(b) computes their taxable income the same way as an individual's. It does not reach a C corporation. The regulations say so directly, and a C corporation's activity is tested instead under the ordinary profit-motive principles of section 162, not section 183's tiered cap and presumption.

• Individuals and S corporations. Covered by the statute's own words; the ordinary case this rule is built around.
• Estates and trusts. Covered through the regulation's extension, taxable income computed the same way an individual's would be.
• C corporations. Not covered. The regulation expressly disclaims any inference about a non-electing corporation's business status, and the ordinary section 162 profit-motive test applies instead.
• Partnerships. Not named directly by the statute or the regulation, but the question of which level gets tested is not open: the Eleventh Circuit, binding in Florida, held in Brannen v. Commissioner that a partnership's profit motive is tested at the partnership level, not separately for each partner, applying section 183(b)'s tiered cap to the partnership's own deductions. A narrower question does stay open. Section 183(a) enumerates only an individual or an S corporation by its own text, and no source I have found, Brannen included, addresses whether that textual limit has any independent bite once Brannen's partnership-level framework applies.

What it requires

Section 183(d) gives a rebuttable presumption of profit motive when the activity's gross income exceeds its deductions in three or more of the five consecutive years ending with the year tested, or two of seven consecutive years for an activity consisting mainly of breeding, training, showing, or racing horses. The presumption shifts the practical footing toward the IRS rather than settling the question, and a genuine start-up has no presumption to lean on yet: there is not enough history for the count to run either way, so an early-year activity is judged purely on the facts and circumstances below.

The nine factors examiners and courts weigh

• How businesslike the activity is run: real records, a written plan, and whether methods change once losses continue.
• The taxpayer's own expertise, or a genuine effort to get expert advice and follow it.
• The time and effort put into the activity, personally or through competent help.
• Whether the activity's assets are expected to appreciate.
• Success in other activities, similar or not.
• The history of income or losses, including whether early losses look like an ordinary start-up period or an unexplained pattern that continues past one.
• How large any occasional profit is relative to the losses and the investment involved.
• The taxpayer's other financial resources, meaning whether substantial outside income exists for a loss to shelter.
• How much personal pleasure or recreation the activity involves.

Treasury's own regulation is explicit that no single factor controls and the determination is not made by counting how many factors favor each side. The nine factors describe what the whole record has to show, weighed together, not a scorecard.

The election to postpone the question

A taxpayer with a genuine start-up can elect under section 183(e), using Form 5213, to postpone the profit-motive determination until the presumption period has run: the close of the fourth tax year after the activity began, the sixth for a horse activity, filed within three years of the first year's due date (without extensions) or within sixty days of a written IRS notice proposing disallowance, whichever applies; the sixty-day route does not extend the three-year window. The trade-off is why this election is not filed reflexively: making it automatically extends the assessment statute, for the activity's deductions and anything tied to adjusted gross income, until two years after the due date, without extensions, of the return for the last year in the presumption period.

What you need to document

Substantiation decides more of these cases than the arithmetic does, and the file has to be built as things happen rather than reconstructed once an exam starts.

Separate books and a real business plan

A dedicated bank account, real bookkeeping, and a written plan for the activity. This is what the first factor above asks for.

Documented expert consultation, actually followed

Evidence of consulting someone with genuine expertise in the activity itself, not a hobbyist friend or the return preparer, plus evidence the advice was actually followed. Getting advice and ignoring it does not help the second factor.

Contemporaneous time records

A log of the taxpayer's own hours, or a competent manager's or employee's records if personal time is limited. Hours reconstructed after the fact carry far less weight than a record kept as the year went on.

Evidence the activity adapted when it lost money

A renegotiated vendor arrangement, a dropped product line, a new marketing channel, any sign the response to a loss year was a change in approach, not more of the same. The case law below treats this as the most persuasive fact available.

Where it goes wrong

Section 183 is a well-documented audit trigger for a client running a loss-generating side activity against substantial outside income, and examiners work the nine factors fact by fact. The outcomes below turn on documented behavior, not the size of the loss.

Nickerson: a start-up plan survives scrutiny

An advertising executive and his wife bought a run-down dairy farm, intending to move into full-time farming after retirement. They leased tillable land to a tenant farmer, sought advice from the local agricultural extension agent, and kept receipts and cancelled checks. The Tax Court found no profit motive, pointing to limited on-site time and the string of losses. The Seventh Circuit reversed: start-up losses during a deliberate multi-year transition are not inconsistent with a genuine profit motive, a qualified tenant farmer can substitute for the taxpayer's own hours, and real expert consultation plus the total absence of recreational use tipped the case for the taxpayers.

Stuller and Gregory: what actually sinks the argument

Estate of Stuller v. United States involved a couple who bred Tennessee Walking Horses through an S corporation, funding roughly $1.5 million in interest-free shareholder loans to keep it running. The activity lost money in every year but one across sixteen years, records tracked bank statements only, and the couple never renegotiated a lopsided deal with their horse trainer as losses mounted. The court affirmed disallowance: only land appreciation favored the taxpayers, while poor records, no adaptation, no real expert consultation, and substantial outside income all cut the other way.

Gregory v. Commissioner matters most for current planning. The Gregorys chartered a yacht through a disregarded entity, conceded the chartering was not for profit, and tried to deduct the tier-two expenses above the line against the activity's own income. On $19.7 million and $80.2 million of reported taxable income across the two years, the IRS recharacterized the expenses as miscellaneous itemized deductions subject to the 2 percent of adjusted gross income floor then in force, wiping the deduction out almost entirely at that income level. The Eleventh Circuit affirmed a $267,221 deficiency, holding that section 183(b)(2) amounts are below-the-line miscellaneous itemized deductions as a matter of statutory structure, not an above-the-line offset. That holding is the basis for the "costs more today" section above.

The recurring mistakes

• No separate books or bank account, with expenses commingled into personal spending, exactly what happened in Stuller.
• An unbroken string of losses with no change in approach. The regulation expects a taxpayer to adapt; standing still while losses continue reads as indifference to profit rather than patience.
• Filing the postponement election reflexively on a start-up whose facts are already weak, which trades a shorter exam window now for a longer open statute later with no real benefit.
• Still claiming tier-two or tier-three expenses as an above-the-line offset after a hobby determination or a concession. Gregory forecloses this; only tier one, and only through an itemized deduction, survives.
• Treating hobby income as self-employment income, or running it through Schedule SE. Section 1402(a) taxes net earnings from a trade or business, and section 183(c) defines a hobby as exactly the activity that is not one, so none of it is subject to self-employment tax.

A situation where this comes up

The version I see most often is a client with substantial W-2 or investment income who also runs a side activity, consulting, a boat charter, a small breeding or training operation, a creative business, that has produced losses for a few years running. Often it is genuinely trying to become a real business, and what is missing is the file: no separate account, no written plan, no record of who was consulted or what changed after the first loss year. That work has to happen while the activity runs, not after an exam starts, since the entire question turns on the contemporaneous record.

The version that concerns me is different: an activity that is genuinely a hobby, one the client enjoys and would keep doing regardless of the numbers, where the losses exist mainly to offset income from elsewhere. That is precisely the fact pattern the nine factors are built to detect, and it is the fact pattern in Stuller above. Guessing wrong here is a double hit rather than a haircut: losing does not just cost the deduction, it adds tax on income that would otherwise have been offset, with almost nothing left to soften it. The suspension behind that result has run without a gap since 2018, and the 2025 legislation made it permanent rather than letting it lapse.