The Most Important Trader Tax Court Cases Every Active Trader Should Know

Last Updated on July 20, 2026 by Robert Green

Reference article for active traders who want a practical roadmap to the leading trader-tax cases. Trader Tax Status is only one part of trader-tax law. Tax Court decisions also address Section 475 elections, mark-to-market accounting, documentation and attribution issues, and the line between traders, investors, and dealers. This article is intended as a practical roadmap to the principal trader-tax cases, not a comprehensive legal digest. See Trader Tax Status for the related tax benefits.

Bottom line

There is no minimum trade count in the tax law for Trader Tax Status. Courts apply a facts-and-circumstances analysis. GreenTraderTax uses approximately 720 total trades per year — counting buys and sells separately — as a practical planning benchmark based primarily on Poppe v. Commissioner, T.C. Memo. 2015-205. That figure is a planning benchmark, not a legal threshold.

Why this companion article matters

Most traders do not need a long legal digest. They need a clear reference piece that:

• identifies the trader-tax cases that matter most,
• separates practical planning benchmarks from legal authority, and
• shows where TTS analysis ends, and Section 475 compliance begins.

Compliance note

Many trader-tax court cases are cautionary stories. The problem is often not one bad fact, but a combination of weak trading activity, poor documentation, missed or defective Section 475 elections, and inadequate representation during IRS exams or appeals. The best strategy is to claim TTS only when the facts support it and to follow Section 475 election procedures exactly.

Quick answers for active traders

Is there a minimum trade count for TTS?

No. Courts weigh volume, frequency, continuity, holding periods, and short-term trading intent.

Is 720 trades per year a legal threshold?

No. It is GreenTraderTax’s planning benchmark based primarily on Poppe.

Is Section 475 the same as TTS?

No. TTS depends on activity. Section 475 requires a separate, valid, timely election by the correct taxpayer.

Only traders eligible for TTS can elect and use Section 475 MTM accounting. TTS and Section 475 are critical issues in many IRS exams and in tax court cases involving traders. In many cases, taxpayers deducted significant ordinary losses they were not entitled to deduct because they either did not qualify for TTS, a prerequisite to using Section 475, or failed to properly elect Section 475.

For existing taxpayers, Section 475 generally involves two steps. First, file a Section 475 election statement for the current year with the prior-year tax return or timely extension by the applicable deadline. Second, perfect the election by filing Form 3115, Change in Accounting Method, with the current-year tax return. A copy of Form 3115 must also be filed with the IRS National Office in Ogden, Utah, at the same time the tax return is filed.

If you miss the applicable election requirements, you generally cannot use Section 475 ordinary gain-or-loss treatment for that year. See more information on how a new entity can make an internal resolution under Section 475 in the checklist below. 

GreenTraderTax Planning Benchmarks

GreenTraderTax uses approximately 720 total trades per year, counting buys and sells separately, as a practical benchmark. Courts also focus on how trades are spread through the year, holding periods, trading days, frequency, business intent, time spent per day, sporadic lapses, operations, account size, and whether the strategy seeks short-term market swings rather than long-term appreciation. See Trader Tax Status: How to Qualify for a fuller discussion of all TTS factors.

GreenTraderTax also considers continuous business activity (CBA) when evaluating close cases. CBA may help support TTS when transaction frequency is a little short, but it is not a replacement for the core benchmarks of trade volume, frequency, trading days, and average holding period.

TTS foundation cases

Case	Main issue	Practical point
Liang v. Commissioner, 23 T.C. 1040 (1955)	Whether the taxpayer’s securities activity rose to the level of a trade or business rather than investing	Early foundation case: traders seek to profit from short-term market swings, not long-term appreciation
King v. Commissioner, 89 T.C. 445 (1987)	Whether trading activity was substantial enough to be a trade or business	TTS depends on substantial activity and business-like trading, not investor behavior
Mayer v. Commissioner, T.C. Memo. 1994-209	Whether the taxpayer’s activity was frequent, regular, and continuous	Courts look at the full trading pattern, not labels or intent alone
Hart v. Commissioner, T.C. Memo. 1997-11	Whether the taxpayer’s activity was continuous and business-like	Sporadic or limited activity weakens TTS
Kay v. Commissioner, T.C. Memo. 2011-159	Whether holding periods and trading pattern supported trader status	Longer holding periods and investment-like patterns weigh against TTS

Key benchmark and caution cases

Case	Main issue	Practical point
Poppe v. Commissioner, T.C. Memo. 2015-205	Whether the taxpayer qualified for TTS, and separately whether he made a valid §475 election	Best practical benchmark case for TTS: about 720 trades per year, regular activity, and substantial time commitment supported TTS; strong TTS facts do not cure a defective §475 election — Rev. Proc. 99-17/Form 3115 compliance matters
Assaderaghi v. Commissioner, T.C. Memo. 2014-33	Whether 535 trades were enough to constitute a trade or business	Trade count alone is not enough; pattern, continuity, and regularity matter more than raw totals
Nelson v. Commissioner, T.C. Memo. 2013-259	Whether the taxpayer’s activity was substantial and continuous enough for TTS	Useful for the distinction between volume and substance; active trading still fails if the overall activity lacks sufficient business character
Endicott v. Commissioner, T.C. Memo. 2013-199	Whether options trading with longer holding periods qualified for TTS	Holding periods of roughly 1 to 5 months were weighed against the trader status; the IRS argued that the taxpayer’s 35-day average holding period was too long.
Holsinger v. Commissioner, T.C. Memo. 2008-191	Whether the taxpayer was trading for short-term swings or investing	Longer holding periods and investment-like behavior weaken TTS
Crissey v. Commissioner, T.C. Summary Opinion 2017-44	Whether an active day trader with more than 500 trades qualified for TTS	Favorable day-trader fact pattern, but nonprecedential; not authority for a 500-trade minimum
Obayagbona v. Commissioner, T.C. Summary Opinion 2016-72	Whether trader facts could overcome failure to make a proper §475 election	Summary Opinion / nonprecedential: trader facts do not cure an election defect; valid, timely election required

Section 475 election and mechanics cases

Case	Main issue	Practical point
Chen v. Commissioner, T.C. Memo. 2004-132	Whether the taxpayer properly made a §475(f) election	Election mechanics matter; taxpayers must follow procedural rules exactly
Knish v. Commissioner, T.C. Memo. 2006-268	Whether the taxpayer was entitled to §475 treatment without proper compliance	No proper election, no §475 treatment
Arberg v. Commissioner, T.C. Memo. 2007-244	Whether trading activity conducted through an account could support the claimed §475 treatment	Ownership, attribution, and account structure matter; the correct taxpayer and correct records are critical
GWA, LLC v. Commissioner, T.C. Memo. 2025-34	Whether a selective or mismatched §475 election was valid in a partnership / basket-option / disregarded-entity setting	Narrower than many summaries suggest: the correct taxpayer must make the election; §475 cannot be selectively applied to only part of a securities-trading business

The six featured cases

1. Poppe — the best practical benchmark case

Poppe v. Commissioner, T.C. Memo. 2015-205 remains the clearest modern case for GreenTraderTax’s trade-count benchmark.

The Tax Court described approximately 60 trades each month, or roughly 720 trades during the year, and found the taxpayer’s activity sufficiently frequent, regular, and continuous to constitute a trade or business.

Poppe was not a complete taxpayer win, however. Although the court found a qualifying trader fact pattern for TTS purposes, it rejected the taxpayer’s claimed Section 475 treatment because he failed to prove a valid prior election under Rev. Proc. 99-17, including an executed Form 3115 and proof it was timely filed or mailed. The court also rejected the taxpayer’s substantial-compliance argument.

Practical takeaway

Poppe supports using roughly 720 total trades per year as a planning benchmark, but it also reinforces that TTS and Section 475 are separate issues.

2. Crissey — helpful, but not a 500-trade rule

Crissey v. Commissioner, T.C. Summary Opinion 2017-44 is often cited because the taxpayer reportedly made more than 500 trades and prevailed.

That makes Crissey attractive to traders looking for a lower numerical benchmark, but it must be used carefully:

• it is a Summary Opinion,
• Summary Opinions are nonprecedential, and
• the opinion does not clearly state whether the trade count refers to executions, sales, or round trips.

Based on the reported trading period, it appears the taxpayer’s active trading may have begun partway through the year, implying a monthly pace of 50 or more trades. That is an inference from the facts, not a stated holding.

Practical takeaway

Crissey supports a favorable day-trader fact pattern. It does not establish a 500-trade threshold.

3. Assaderaghi — pattern matters more than totals

Assaderaghi v. Commissioner, T.C. Memo. 2014-33 shows why trade count alone is not enough.

Although the taxpayer made 535 trades, the court found the activity too irregular and not sufficiently continuous. The court also noted the taxpayer’s full-time engineering job, the lack of persuasive evidence regarding many of the holding periods, and that the activity was not sufficiently substantial overall to constitute a trading business.

Pattern Matters More Than Totals

Assaderaghi is the cautionary case for traders who focus only on annual trade count. A respectable total does not carry the day if the trading is clustered, continuity is weak, holding periods are not demonstrated, or the taxpayer’s overall activity does not appear to be a real trading business.

Practical takeaway

A trader with steady year-round activity has a stronger TTS fact pattern than a trader with a similar annual total concentrated into short bursts.

4. Nelson — substantiality and continuity still control

Nelson v. Commissioner, T.C. Memo. 2013-259 is better understood as a substantiality-and-continuity case than a pure documentation case.

The court focused on limited trading days, significant gaps in activity, and the taxpayer’s full-time nontrading work. Although the opinion also noted uncertainty about which trades were attributable to the taxpayer, the court made clear that she would lose even assuming all trades were hers.

Nelson also helps illustrate the difference between volume and substance. Volume is the number of transactions; substance looks at the size, materiality, continuity, and overall business character of the trading activity.

Practical takeaway

Even more than 500 trades can fail if trading days are limited and the overall activity pattern is not sufficiently regular and continuous.

5. Obayagbona — trader facts do not fix a bad election

Obayagbona v. Commissioner, T.C. Summary Opinion 2016-72 is also a nonprecedential Summary Opinion, but it remains useful as an educational example.

The lesson is straightforward: taxpayer arguments for trader status do not cure a defective or late Section 475 election.

Practical takeaway

TTS and mark-to-market treatment are separate. Qualifying as a trader does not automatically produce ordinary-loss treatment.

6. GWA — a technical but important Section 475 case

GWA, LLC v. Commissioner, T.C. Memo. 2025-34 arose in a partnership / basket-option substance-over-form context, not a typical individual active-trader TTS dispute.

Its Section 475 lesson is narrower and more technical than many summaries suggest. The Tax Court treated the trading activity of the disregarded entity as attributable to its owner, and it rejected an impermissibly selective Section 475 election that did not cover the taxpayer’s full securities-trading business.

The Tax Court also rejected the selective election problem because the election was not made with respect to the taxpayer’s entire business as a securities trader, and a taxpayer trading only securities cannot elect mark-to-market treatment for less than all of its securities-trading business.

Practical takeaway

The correct taxpayer must make the election, and the election cannot be selectively limited to only part of the securities-trading business.

Holding periods and the 31-day benchmark

Holding periods are one of the best indicators of whether a taxpayer is trying to capture short-term market swings.

GreenTraderTax uses an average holding period of 31 days or less as a practical benchmark. The IRS argued in Endicott that the average holding period of 35 days was too long. Traders should not read the cases as creating a simple safe harbor: courts still examine the full pattern of activity, including volume, frequency, continuity, trading days, and short-term trading intent.

Cases such as Holsinger v. Commissioner, T.C. Memo. 2008-191, Kay v. Commissioner, T.C. Memo. 2011-159, and Endicott v. Commissioner, T.C. Memo. 2013-199 support the broader point that longer holding periods weigh against trader status.

Practical takeaway

Shorter holding periods generally help, but courts still examine the full trading pattern.

Section 475: separate from TTS

One of the biggest trader-tax misunderstandings is confusing TTS with Section 475.

• TTS is based on activity.
• Section 475(f) requires a separate, valid, timely election by the correct taxpayer.
• A trader can have a strong TTS fact pattern and still lose Section 475 treatment if the election was not made properly or on time.

Rev. Proc. 99-17 provides the exclusive procedure for traders in securities or commodities to make a Section 475 election.

For election timing and filing mechanics, see our Section 475 election-deadline guide.

How traders should use these lists

• Start with the table of key benchmark and caution cases for planning and client education.
• Use the foundation and Section 475 tables as deeper reference lists when comparing fact patterns.
• Treat the cases as practical guidance, not numeric formulas.

Four practical reminders

• TTS depends on actual trading activity.
• 720 trades is a planning benchmark, not a legal threshold.
• Section 475 requires eligibility and a valid election by the correct taxpayer.
• Segregate trading and investing: Keep trading-business positions separate from long-term investment positions, with clear records identifying which positions belong to each category.

2026 TTS Planning Checklist

Use these as planning targets, not legal requirements.

• Trade count: Approximately 720 total trades per year.
• Counting method: Count buys and sells separately.
• Monthly pace: Around 60 trades per month.
• Continuity: Spread trading across the year; avoid clustering activity into short bursts.
• Trading days: Be active on a high percentage of available market days; our benchmark is 75%.
• Holding period: Preferably 31 days or less on average as a planning benchmark.
• Strategy: Focus on short-term market swings rather than long-term appreciation.
• Documentation: Maintain trade logs, brokerage statements, expense records, time records, and business records.
• Segregate trading and investing: Keep trading-business positions separate from long-term investment positions, with clear records identifying which positions belong to each category.
• Other factors: See How To Qualify for TTS.
• Section 475 deadline for existing traders: For 2026 treatment, attach the election statement to the timely filed 2025 return without extensions, or to a timely extension request, as required under Rev. Proc. 99-17, Section 5.03(1).
• Section 475 for true “New Individual” Taxpayers: A new trader is not a new taxpayer if they have filed a prior-year individual federal tax return. Under Rev. Proc. 99-17 § 5.03(2), a true new individual taxpayer (e.g., a student or immigrant with no previous filing history) makes the election within 2 months and 15 days of starting operations. 
• Section 475 Entity Deadline Reset (75-Day Rule): If an existing individual misses the April 15 deadline, they can form a new entity (Partnership or S-Corp) later in the year to reset the clock. The new entity “adopts” Section 475 from inception via an internal books-and-records resolution within 75 days of inception—bypassing the need to file a Form 3115. 
• Correct taxpayer: If the entity is disregarded, the owner is generally the taxpayer who must make the election. The GWA court emphasized that, after a single-member LLC has disregarded status, elections are made by the single member, not by the disregarded entity itself.

When to get professional help

Traders should seek qualified tax advice before filing returns, making Section 475 elections, responding to IRS notices, or petitioning the Tax Court. Many trader-tax losses are avoidable compliance failures, not unavoidable legal defeats.

Final takeaway

The planning lesson is simple: build the TTS fact pattern, document the trading business, and make any Section 475 election on time and by the correct taxpayer.

Related content

• Green’s 2026 Trader Tax Guide
• Tax Center: Trader Tax Status, How to Qualify for TTS, and Section 475 MTM Accounting

In Essence

Trader Tax Status is not based on a single magic number; it depends on the trader’s overall activity pattern. Use the cases as guardrails, not safe harbors, and treat Section 475 as a separate compliance step that must be done correctly and on time.