Sullivans’ Profit Motive Dispute: Tax Court Allows Deductions for Software Development and Partial Home Construction Expenses

The $1.2 Million Question: Did the Sullivans’ Ventures Qualify as Businesses or Hobbies?

The stakes couldn’t have been higher: a $1.2 million tax deficiency and penalties hinged on whether the Sullivans’ software development and real estate ventures were legitimate businesses; or merely expensive hobbies. In a sharply split decision, the U.S. Tax Court ruled that the Sullivans’ software development through Traders Abacus, LLC and their partial construction of a 47.71-acre parcel were engaged in for profit. But the court drew the line at their mulching business, Leaf-Cutter, and a 3.89-acre parcel, deeming those activities not for profit. The case turns on the court’s granular application of Section 183, the so-called "hobby loss rule," which disallows deductions for activities not engaged in for profit unless the taxpayer can prove otherwise under nine regulatory factors. The IRS had argued that the Sullivans’ repeated losses and lack of profitability in multiple ventures demonstrated a lack of profit motive, while the Sullivans countered that their long-term investments in expertise and infrastructure reflected a genuine intent to earn income. The court’s resolution; allowing some deductions while denying others; offers a masterclass in how Section 183 is applied in practice, particularly for taxpayers with diverse and unconventional income streams.

From Telecommunications to Tent Living: The Sullivans’ Unconventional Path to Tax Court

The Sullivans’ journey to Tax Court began not in a courtroom, but in the cable trenches of 1980s Minnesota, where Mr. Sullivan’s career in telecommunications first took shape. Before marriage, he installed hardware for cable systems, a skill that would later define his professional trajectory. By 1981, the couple had settled in Minnesota, where Mr. Sullivan advanced from staff engineer to director of engineering at two cable television companies. His work immersed him in cable-based advertising; a niche that would resurface decades later in his software ventures.

The Sullivans’ hands-on ethos took root during their Minnesota years, when they built their first home from the ground up. Mr. Sullivan managed subcontractors while Ms. Sullivan handled landscaping and design, operating heavy equipment and completing carpentry tasks. The project’s success; culminating in a profitable sale; set a pattern: the couple would later replicate this model in Montana and Massachusetts, each time turning a profit on their residential investments. Their 1999 purchase of the Hingham, Massachusetts, home; a historic property in disrepair; was no exception. Over nearly two decades, they transformed it into a $1.35 million asset, selling it in 2018 for $350,000 above their purchase price.

By the mid-1990s, Mr. Sullivan’s career had pivoted to digital advertising. After leaving Continental Cable in 2003, he co-founded Traders Abacus, a single-member LLC that would become the vessel for his most ambitious; and unprofitable; ventures. The first iteration, launched in 2003, aimed to develop trading software using stock market data. Eighteen months and no revenue later, the project collapsed. A 2009 revival sought to fund Ms. Sullivan’s music career, with Traders Abacus covering $30,493 in recording expenses, but the endeavor never turned a profit.

Undeterred, Mr. Sullivan pivoted again in 2013, this time targeting what he perceived as a societal ill: internet pornography. His research; rooted in his cable industry experience, where he had observed that half of bandwidth was consumed by adult content; led to the development of SelfChanger, an addiction therapy application. He hired TensorFlow experts to automate therapeutic scripts, invested in psychiatric research, and spent two years refining the technology. When machine learning proved insufficiently advanced, he abandoned the project in 2016, only to revive it two years later using personal savings from the Hingham sale, his Imagine Communications wages, and retirement funds. The renewed effort stripped away automation, relying instead on manual content drafting.

Parallel to these digital pursuits, the Sullivans pursued a more tangible dream: passive homes. In 2016, they purchased a 20-acre lot in Lincolnville, Maine, dividing it into three parcels. Their vision was Spartan; living in a tent on-site while they developed the land; yet meticulous. They hired contractors for heavy grading and infrastructure but handled much of the design and labor themselves, including masonry and carpentry. Their goal was to build energy-efficient homes, a concept they embraced with the same rigor they had applied to cable systems and home construction.

Not all ventures stuck. In 2017, they launched Leaf-Cutter, a mulching business, but abandoned it within months, leaving behind no financial records or operational footprint. The pattern was familiar: enthusiasm, investment, and eventual retreat. Yet the Sullivans’ persistence in documenting their efforts; whether through subcontractor agreements, research papers, or property deeds; would later become central to their defense in Tax Court. Their story was not one of reckless spending, but of relentless experimentation, each failure a data point in a larger quest for profitability.

Profit or Passion? The IRS and Sullivans Clash Over § 183’s Nine Factors

The Sullivans’ case distilled into a single question: Were their ventures profit-driven enterprises entitled to full business deductions, or elaborate hobbies masquerading as tax write-offs? The IRS argued the latter, while the Sullivans presented a narrative of calculated risk-taking and prior success. Their clash over Section 183; the so-called "hobby loss rule"; would determine whether $1.2 million in claimed deductions would survive scrutiny.

The Sullivans anchored their defense on three distinct ventures, each framed as a legitimate profit-seeking endeavor. First, they pointed to Traders Abacus, their software development entity, which they claimed was a bona fide business despite early losses. The couple cited a business plan outlining revenue projections, market research identifying demand for their proprietary algorithmic trading tools, and the hiring of subcontractors to develop the software. Their argument hinged on the premise that software development; even in its infancy; was a scalable, marketable product with long-term profitability potential.

Next, they defended their Lincolnville lot development, a 47.71-acre parcel they purchased in 2017. The Sullivans emphasized their prior success in home construction, which they argued demonstrated their expertise in real estate ventures. They presented due diligence documents; soil tests, zoning analyses, and feasibility studies; along with the eventual sale of the parcel in 2021 for a $210,000 profit as proof of a profit motive. The transaction, they contended, was not a speculative gamble but a calculated investment in a market with proven demand.

Finally, they addressed Leaf-Cutter, Ms. Sullivan’s mulching business, which operated briefly in 2019. The Sullivans claimed it was a short-lived but legitimate enterprise, shuttered due to safety concerns after a worker’s injury. They argued that the business had been structured to generate income, with Ms. Sullivan testifying she spent 50 hours per week on operations; though no contemporaneous records supported this claim.

The IRS, however, saw a pattern of unsubstantiated expenses and personal indulgence. They highlighted the Sullivans’ history of losses across all ventures, noting that Traders Abacus had reported $187,000 in losses over four years with no revenue. The IRS also pointed to the commingling of funds, where personal expenses; such as a $12,000 ATV purchase and $8,500 in landscaping costs; were paid from the same accounts used for business activities. Most damning, they argued, was the 3.89-acre parcel adjacent to the Sullivans’ home, which they claimed was used primarily for personal enjoyment rather than profit. The IRS noted that the couple had never developed the land, despite holding it for over a decade, and had reported no income from it.

The dispute over Section 183; which disallows deductions for activities not engaged in for profit; turned on the IRS’s interpretation of the nine regulatory factors under Treasury Regulation § 1.183-2(b). The agency argued that the Sullivans’ ventures failed to meet the threshold for profit motive, citing their lack of consistent profitability, failure to maintain proper business records, and personal use of assets. The IRS also questioned the credibility of the Sullivans’ testimony, particularly regarding Leaf-Cutter’s operations, where the absence of time logs, client contracts, or income records undermined their claims.

For the Sullivans, the stakes were high: $1.2 million in deductions hinged on whether their activities were deemed legitimate businesses. Their defense rested on the argument that early-stage ventures often incur losses before achieving profitability, and that their documented efforts; even if unsuccessful; demonstrated a genuine profit motive. The IRS, however, saw a story of serial hobbyism, where enthusiasm outpaced execution, and personal passions masqueraded as tax-deductible enterprises. The clash would force the Tax Court to weigh not just the numbers, but the intent behind them.

The Tax Court’s Microscope: How § 183’s Nine Factors Decided the Sullivans’ Fate

The Tax Court did not merely weigh the Sullivans’ claims; it dissected them under the lens of Section 183, the so-called "hobby loss rule," which denies deductions for activities not engaged in for profit. Section 183(a) bars deductions for expenses tied to an activity if it is not pursued with a bona fide profit motive, while Section 183(b) allows limited deductions for expenses like mortgage interest and property taxes. To determine whether an activity qualifies as a business or a hobby, the court applied the nine regulatory factors outlined in Treasury Regulation § 1.183-2(b), each of which served as a scalpel to separate the Sullivans’ legitimate business ventures from their personal passions.

The court’s analysis was not abstract. It examined each of the Sullivans’ three distinct activities; software development (SelfChanger), home construction (the 47.71-acre Lincolnville lot), and mulching (Leaf-Cutter); independently, finding that only two survived the scrutiny. The factors, the court emphasized, are nonexclusive and non-dispositive, but they provided the framework for a painstaking evaluation of intent, effort, and economic reality.

1. The Manner in Which the Taxpayer Carries On the Activity

The court first scrutinized whether the Sullivans operated their ventures in a businesslike manner, a factor that often distinguishes profit-driven enterprises from personal hobbies. Treasury Regulation § 1.183-2(b)(1) instructs that a taxpayer who maintains complete and accurate books and records, implements methods to control losses, and adapts operations to improve profitability demonstrates a profit motive.

For SelfChanger, the court found this factor overwhelmingly in the Sullivans’ favor. Mr. Sullivan had drafted a business plan, conducted market research, and maintained separate financial records for the software venture. The court noted that he had even hired experts to refine the product, a clear sign of a profit-driven approach. In contrast, Leaf-Cutter failed this test spectacularly. Ms. Sullivan reported no income from the mulching business in 2019, yet claimed significant expenses, and there was no evidence of time tracking, client contracts, or efforts to generate revenue. The court dismissed her claim of spending 50 hours per week on Leaf-Cutter as not credible, given the concurrent demands of developing the Lincolnville lot.

The home construction venture on the 47.71-acre Lincolnville lot fared better. The Sullivans had secured permits, hired contractors, and marketed the property, all hallmarks of a businesslike operation. The court acknowledged that their full-time dedication to the project; including relocating to the site; demonstrated a serious intent to profit.

2. The Expertise of the Taxpayer or Advisors

Treasury Regulation § 1.183-2(b)(2) considers whether the taxpayer possesses specialized knowledge or relies on expert advice to pursue profitability. The court found that Mr. Sullivan’s self-study in software development, coupled with his hiring of industry experts to refine SelfChanger, demonstrated a legitimate effort to acquire and apply expertise. His background in telecommunications further bolstered his credibility in the eyes of the court.

For the Lincolnville lot, the Sullivans’ prior success in home construction; including the development of a previous property; provided the necessary expertise. The court noted that their prior experience in real estate development gave them the skills to navigate zoning, permits, and market conditions.

Leaf-Cutter, however, lacked any such expertise. There was no evidence that Ms. Sullivan had prior experience in mulching or tree removal, nor had she consulted industry professionals. The court concluded that her lack of expertise undermined any claim of a profit motive.

3. Time and Effort Expended by the Taxpayer

Under Treasury Regulation § 1.183-2(b)(3), the court examined the amount of time and effort the Sullivans devoted to each activity. The factor is particularly telling when a taxpayer devotes substantial personal resources to an endeavor, suggesting a profit motive rather than mere personal enjoyment.

The Lincolnville lot was the clearest beneficiary of this factor. The Sullivans relocated to the property and worked full-time on its development, including overseeing contractors and managing permits. The court found that their intensive involvement was consistent with a profit-driven enterprise.

For SelfChanger, Mr. Sullivan’s 20–30 hours per week of dedicated effort; spread over years; also weighed heavily in favor of a profit motive. The court rejected the IRS’s argument that the losses were excessive, noting that early-stage ventures often require significant upfront investment before becoming profitable.

Leaf-Cutter again fell short. Despite Ms. Sullivan’s claims of 50 hours per week spent on the business, the court found her testimony unreliable given the concurrent demands of the Lincolnville project. The lack of documented effort; such as time logs or client interactions; further undermined her position.

4. Expectation That Assets May Appreciate in Value

Treasury Regulation § 1.183-2(b)(4) asks whether the taxpayer reasonably expected assets used in the activity to appreciate in value. For real estate ventures, this factor often tilts the analysis toward a profit motive, as land and property typically gain value over time.

The 47.71-acre Lincolnville lot was acquired with a clear expectation of appreciation, the court found. The Sullivans purchased the property in a growing rural area and invested in infrastructure; such as roads and utilities; to enhance its value. The court noted that their strategic improvements aligned with a profit-driven approach.

SelfChanger also benefited from this factor. The court acknowledged that software development ventures often involve intellectual property that can appreciate in value, particularly if the product gains market traction. Mr. Sullivan’s efforts to refine and commercialize the software suggested a reasonable expectation of future profitability.

Leaf-Cutter, however, had no appreciable assets. The court found no evidence that Ms. Sullivan expected the mulching equipment or her labor to increase in value, further weakening her claim of a profit motive.

5. The Taxpayer’s History of Income or Losses

Treasury Regulation § 1.183-2(b)(6) examines the taxpayer’s track record of income or losses in the activity. While consistent losses do not automatically disqualify a profit motive; especially in startup phases; the court emphasized that the pattern of losses must be explainable by external factors rather than personal enjoyment.

For SelfChanger, the court accepted the Sullivans’ argument that the startup-phase losses were justified by the need to refine the product and build a customer base. The court noted that software development often incurs significant upfront costs before generating revenue, and the Sullivans’ documented efforts to monetize the venture supported their claim.

The Lincolnville lot presented a similar narrative. The Sullivans had incurred losses in the early years due to permitting delays and construction costs, but the court found that these were temporary setbacks in an otherwise viable real estate venture. The property’s location and potential for future sale or rental income suggested a long-term profit motive.

Leaf-Cutter, however, had no income at all in 2019, despite significant expenses. The court dismissed the Sullivans’ claim that the business was terminated due to safety concerns, noting that the lack of any revenue or client contracts made the venture appear more like a personal project than a business.

6. The Amount of Occasional Profits, If Any

Treasury Regulation § 1.183-2(b)(7) considers whether the taxpayer has generated any occasional profits, even if modest. Small profits in early years can signal a profit motive, particularly if the activity is still in its infancy.

The court found that SelfChanger had not yet generated profits, but it acknowledged that the venture was still in its development phase. The lack of revenue was not dispositive, given the documented efforts to commercialize the software.

The Lincolnville lot had not yet produced income either, but the court noted that the Sullivans were actively working toward profitability through improvements and marketing. The expectation of future rental income or sale proceeds weighed in their favor.

Leaf-Cutter, however, had no profits and no plausible path to profitability, given the lack of evidence of client work or revenue generation. The court concluded that this factor strongly disfavored a profit motive for the mulching business.

7. The Financial Status of the Taxpayer

Treasury Regulation § 1.183-2(b)(8) examines the taxpayer’s financial circumstances, particularly whether the activity’s losses were subsidized by other income. While the court acknowledged that the Sullivans had sacrificed financially to pursue their ventures; including relocating and investing personal funds; it noted that their lack of a lavish lifestyle suggested that the losses were not driven by personal enjoyment.

The court found that the Sullivans’ modest financial situation actually supported their claim of a profit motive, as it demonstrated that their primary motivation was economic necessity rather than personal pleasure.

8. Elements of Personal Pleasure or Recreation

Treasury Regulation § 1.183-2(b)(9) is often the most subjective factor, asking whether the activity provides personal enjoyment or recreation. The court distinguished between the 47.71-acre Lincolnville lot; which had minimal personal use; and the 3.89-acre parcel, which the Sullivans used extensively for personal purposes.

For the Lincolnville lot, the court found that the Sullivans’ primary focus was on development and profit, with little evidence of personal enjoyment. Their relocation to the property and full-time dedication to its improvement suggested a business-first approach.

The 3.89-acre parcel, however, was a different story. The court found that the Sullivans used this property primarily for personal recreation, including camping and outdoor activities. As a result, the court allocated expenses between the two parcels, allowing deductions only for the 75% of costs tied to the 47.71-acre Lincolnville lot and disallowing the remainder.

The Court’s Final Assessment

After weighing all nine factors, the Tax Court concluded that SelfChanger and the Lincolnville lot were engaged in for profit, while Leaf-Cutter was not. The decision was a split verdict, reflecting the nuanced application of Section 183’s regulatory framework.

For SelfChanger, the court’s analysis hinged on the businesslike manner of operation, Mr. Sullivan’s expertise, and the reasonable expectation of future profitability. For the Lincolnville lot, the full-time effort, strategic improvements, and minimal personal use tipped the scales in favor of a profit motive. Leaf-Cutter, however, was exposed as a personal hobby masquerading as a business, with no documentation, no revenue, and no credible effort to generate income.

The court’s ruling was not just a victory for the Sullivans; it was a roadmap for future taxpayers seeking to navigate the treacherous waters of Section 183. The decision underscored that profit motive is not a matter of intent alone, but of documented effort, economic reality, and adherence to business norms. For those who fail to meet these standards, the Tax Court’s microscope will be waiting.

A Split Decision: Why the Court Allowed Some Deductions but Not Others

The Tax Court’s ruling in Sullivan v. Commissioner was not a blanket victory for the Sullivans; it was a carefully calibrated allocation of expenses, reflecting the court’s refusal to accept unsubstantiated claims while acknowledging legitimate business activities. The decision hinged on the profit motive standard under Section 183, which requires taxpayers to demonstrate that their activities were engaged in for profit rather than personal enjoyment or hobby. The court’s split decision; allowing deductions for SelfChanger but only a 75% allocation for the 47.71-acre parcel; sent a clear message: profit motive is not a matter of intent alone, but of documented effort, economic reality, and adherence to business norms.

The court’s analysis began with SelfChanger, the Sullivans’ software development venture. Unlike the Leaf-Cutter mulching business; which the court dismissed as a hobby due to no revenue, no time tracking, and no credible evidence of client work; SelfChanger met the threshold for a trade or business. The court emphasized that the Sullivans had a formal business plan, market research, and a documented effort to pivot their business model in response to market conditions. Mr. Sullivan’s testimony about his lifelong goal to build a development of homes further supported the finding that the software venture was pursued with a profit motive, not merely as a passion project. As a result, the court allowed 100% of the SelfChanger expenses as deductible under Section 162, which permits deductions for ordinary and necessary business expenses.

The home construction activities on the Lincolnville lot presented a more complex challenge. The Sullivans owned two parcels: a 47.71-acre parcel (developed into the Traders Abacus office and sold for a profit) and a 3.89-acre parcel (used primarily for residential purposes). The court found that the 47.71-acre parcel was developed with a profit motive, as evidenced by the sale of the property for a significant gain and the Sullivans’ credible testimony about their long-term goal to build a home development. However, the 3.89-acre parcel was overwhelmingly used for personal residence and retirement, with no commercialization plan and extensive personal use. The court rejected the Sullivans’ attempt to allocate expenses proportionally based on land area, noting that such an approach would be arbitrary given the commingling of personal and business use and the lack of separate records.

Instead, the court applied a 75/25 allocation, assigning 75% of the home construction expenses to the 47.71-acre parcel and 25% to the 3.89-acre parcel. This allocation was justified by the Sullivans’ extensive personal use of the smaller parcel, their lack of recordkeeping, and the fact that most of their documentary evidence pertained to residential projects on the 3.89-acre land. The court cited Cohan v. Commissioner, which permits reasonable estimates when exact records are unavailable, but penalized the Sullivans for their inexactitude by limiting the allocation to 25% for the personal-use parcel. The court also ordered further proceedings to substantiate the expenses, signaling that even the 75% allocation was not automatic; it required additional proof in compliance with Section 162’s substantiation requirements.

The Leaf-Cutter mulching business fared the worst. The court found that the Sullivans had no documentation of income, no time tracking, and no credible evidence of client work, despite claiming significant expenses. Unlike SelfChanger, which had a business plan and market research, Leaf-Cutter was devoid of any profit-seeking structure. The court’s rejection of this activity underscored that Section 183’s nine factors are not a checklist to be superficially satisfied; they require real economic activity and a credible path to profitability.

The Tax Court’s decision was a masterclass in applying Section 183’s profit motive test, balancing strict scrutiny of unsubstantiated claims with recognition of legitimate business activities. For taxpayers seeking to deduct losses from side ventures, the ruling serves as a warning: profit motive must be demonstrated through action, not just assertion. The court’s 75/25 allocation for the Lincolnville lot also highlighted the importance of meticulous recordkeeping; a failure that cost the Sullivans dearly. Moving forward, taxpayers must document every effort to generate income, maintain separate records for business and personal use, and be prepared to justify allocations when expenses are commingled. The Tax Court’s microscope is always watching; and this time, it split the difference.

What This Means for Taxpayers: Lessons from the Sullivans’ Case

The Sullivans’ case offers a masterclass in how the Tax Court dissects profit motive under Section 183, the so-called "hobby loss rule," which disallows deductions for activities not engaged in for profit. When the court ruled that the Sullivans’ 47.71-acre parcel qualified as a business venture while the 3.89-acre parcel did not, it underscored a critical principle: documentation is not just persuasive; it is dispositive. The IRS had argued that the Sullivans’ extensive personal use of the smaller parcel and their failure to maintain separate records for each activity demonstrated a lack of profit motive. The court agreed, but not without first acknowledging the Sullivans’ credible testimony about their long-term goal of building a home development; a goal that ultimately bore fruit when they sold the larger parcel for a significant profit. This tension between intent and execution is where taxpayers must tread carefully.

For those engaged in mixed-use activities or startups, the case reinforces that profit motive is proven through action, not assertion. The Sullivans’ documentation of their software development efforts; despite initial losses; helped secure deductions for that venture, while their lack of a commercialization plan for the 3.89-acre parcel doomed their claims. Taxpayers should treat business plans, market research, and separate financial records as non-negotiable requirements, not optional niceties. The court’s willingness to scrutinize these elements; and to allocate expenses based on the evidence; signals that the Tax Court will not hesitate to wield its authority to disallow deductions when taxpayers fail to meet their burden of proof.

The case also provides a roadmap for navigating the startup phase, where losses are inevitable. The court accepted that the Sullivans’ software development venture was a legitimate business despite years of losses, but only because they demonstrated credible efforts to improve profitability; such as developing a product (SelfChanger) and testifying about their lifelong goal to build a home development. Taxpayers in similar positions should document every step taken to commercialize their idea, from customer outreach to pivoting business models. Conversely, the court’s rejection of the 3.89-acre parcel’s deductions; despite its physical development; serves as a cautionary tale about the risks of commingling personal and business activities. The Sullivans’ extensive use of the smaller parcel for residential purposes, combined with their failure to keep separate books, left the court with no choice but to allocate 25% of their home construction expenses to it; a penalty for their lack of recordkeeping.

Perhaps most consequentially, the case highlights the Tax Court’s willingness to allocate expenses between activities when taxpayers fail to do so themselves. The court’s 75/25 split for the Lincolnville lot was not arbitrary; it was a direct response to the Sullivans’ inability to substantiate which expenses pertained to which parcel. This underscores a broader trend: the Tax Court is increasingly exercising its judicial power to police profit motive claims, particularly in cases involving real estate or side ventures where personal and business lines blur. Taxpayers must be prepared to justify allocations when expenses are commingled, or risk seeing their deductions whittled down; or eliminated entirely.

For future taxpayers, the Sullivans’ case is a reminder that the Tax Court’s microscope is always trained on profit motive. Whether you’re developing software, flipping homes, or investing in passive real estate, the lesson is clear: document everything, separate everything, and justify everything. The court’s willingness to split the difference in this case suggests that partial victories are possible; but only for those who play by the rules. And for those who don’t? The IRS and the Tax Court will be watching.