Mark-to-Market Trader Status §475(f) Election 2026

When the §475(f) election creates real economic value

The election shines for traders whose losses exceed US$3,000 in any single year. Default capital-loss rules allow only US$3,000 to offset ordinary income (Form 1040 line 7), with excess carried forward to future years. An active options trader with US$25,000 of 2025 losses can deduct US$3,000 in 2025 and carry US$22,000 forward — potentially indefinitely if no capital gains arise. Under §475(f), the entire US$25,000 deducts against ordinary income in 2025 itself.

For taxpayers in the 24%-37% federal bracket plus state, accelerating a US$22,000 deduction by 5+ years has a present-value impact of US$3,000-US$8,000. This calculation alone justifies the election for traders with consistent net losses.

The election also removes the structural drag of §1091 wash sales, which can disallow 10-30% of a losing trader's harvest in any given year. The wash-sale exemption is not directly monetary but improves the realization timing of recognized losses.

When the election destroys economic value

Traders with consistent net gains lose preferential long-term capital-gain rates under §475(f). A trader who holds positions 1+ year and recognizes US$200,000 of long-term gain in 2027 pays US$30,000-US$48,000 federal under default capital-gain rules (15-20% bracket plus 3.8% NIIT). The same US$200,000 under §475(f) is ordinary income, potentially US$60,000-US$74,000 federal (24%-37% bracket).

Because the election is irrevocable for 5 years, traders cannot toggle in and out based on annual P/L. The decision is structural, made under uncertainty about future returns.

Trader status documentation: the litigation standard

Levin v. Commissioner (1979) established the modern trader-status test. The court considered: (1) the taxpayer's intent to derive income from market price movements rather than long-term appreciation or dividend yield, (2) the substantiality of the activity in terms of frequency, regularity, and dollar volume, (3) the average holding period of positions.

Subsequent cases (Boatner, Henricks, Holsinger) have hardened the standards. Common minimums in 2026 case law: 4-5 hours daily activity, 4-5 trading days per week, 1,000+ trades per year, average holding periods under 1 week. Below these thresholds the IRS Examination Division will challenge trader status and re-classify the activity as investor (subject to capital-gain treatment and §212 expense limitations).

Mechanics of the year-end mark-to-market

On the last business day of the tax year (typically December 31), each open securities position is marked to fair market value. The gain or loss flows to Form 4797 part II (Sales of Property Used in a Trade or Business) and ultimately to Form 1040 as ordinary income.

Open positions reset their basis to the marked value on January 1. There is no holding period — every position is treated as if sold and repurchased. This eliminates the wash-sale rule because every loss is permanently recognized at year end with no opportunity for disallowance.

Practical implication: traders should expect their tax return preparation to include all open year-end positions, not just closed trades. A broker statement showing realized + unrealized P/L is essential.

Schedule C deductions available under trader status

Investor expenses are no longer deductible after TCJA 2017 eliminated miscellaneous itemized deductions. Trader-status expenses on Schedule C are above-the-line deductions reducing AGI, which can also lower NIIT exposure and state tax.

• Home office (if used regularly and exclusively for trading)
• Computer, monitors, trading software subscriptions
• Market data feeds (Bloomberg, Refinitiv, FactSet)
• Educational expenses for trading-related courses and conferences
• Trading-specific professional fees (tax preparation, attorney, CPA)
• Margin interest on trading accounts (not investment-interest limited)
• Travel for trading-related conferences and broker visits
• Health insurance via self-employed health-insurance deduction (if entity structure permits)

Entity structure considerations: LLC vs S-Corp

Many serious traders adopt a single-member LLC (disregarded entity) for liability protection without changing federal tax treatment. The LLC files no separate federal return; trading income still flows through Schedule C of Form 1040.

Higher-income traders sometimes elect S-Corp treatment via Form 2553. The S-Corp pays the trader a 'reasonable' W-2 salary subject to self-employment tax; remaining profit flows through as ordinary K-1 income not subject to SE tax. The arrangement can save US$10,000-US$20,000 in SE tax annually but requires more administrative complexity (separate corporate return, payroll, retirement plan setup).

The structure decision should be made with a CPA experienced in trader entities — common mistakes include taking too-low W-2 salary (triggering reasonable-compensation challenge), failing to maintain corporate formalities (piercing the veil), and electing S-Corp without sufficient income to justify the costs.