Trader tax · 8 min read
Trader tax basics: wash sales and mark-to-market accounting
A plain-English introduction to trader tax workflows, wash sales, and Section 475 mark-to-market accounting context.
Read this first: educational context, not tax advice
Trader taxation in the United States is genuinely complex, fact-specific, and changes over time. This article explains common concepts at a high level so you can have a more informed conversation with a professional — it is not tax, legal, or accounting advice, and it does not address your individual situation. Before acting on anything here, consult a qualified CPA or tax attorney who works with active traders, and rely on primary sources such as IRS publications and your professional's guidance.
Trader tax status is a high bar, not a checkbox
The favorable treatments active traders read about generally hinge on qualifying for 'trader tax status' (TTS) in the eyes of the IRS, which is determined by facts and circumstances — frequency, continuity, volume, holding periods, and the intent to profit from short-term price movement rather than from dividends or long-term appreciation. There is no form you file to simply elect it, and casual or part-time activity usually does not qualify. Because the criteria are subjective and have been litigated, this is precisely the kind of determination that belongs with a professional rather than a self-assessment.
Wash sales create recordkeeping pressure
The wash-sale rule disallows a loss when you buy a substantially identical security within 30 days before or after realizing that loss, deferring the loss into the basis of the replacement position. For an active trader cycling in and out of the same names, this can generate a long chain of basis adjustments that is nearly impossible to reconstruct by hand at year-end. The practical takeaway is that the cost of wash sales is as much an operational problem — keeping accurate, lot-level history all year — as it is a tax one. Disorganized records are where traders get hurt, regardless of which rules apply.
What mark-to-market (Section 475) actually changes
A Section 475(f) mark-to-market election, available to those who qualify for trader tax status, treats open positions as if sold at year-end and generally converts gains and losses to ordinary treatment. Two consequences are most discussed: the wash-sale rule generally no longer applies to the marked positions, and there are different implications for loss treatment. But the election has strict, easy-to-miss timing and procedural requirements, it is consequential and not casually reversible, and it interacts with other parts of a return. This is firmly professional territory — the point of understanding it is to ask better questions, not to self-elect.
Where analytics help — and where they stop
Software can do a great deal of the heavy lifting on the recordkeeping side: keeping lot-level trade history organized, letting you compare existing P&L under different accounting views (FIFO, LIFO, specific-lot, mark-to-market), and producing clean exports for your CPA. What software should not do is compute your personalized tax liability, prepare your return, or record a Section 475(f) election for you. BlitzPulse's tax-aware reporting is portfolio analytics in that first category — it organizes and visualizes; it does not advise. Treat its outputs as inputs to a professional, not as conclusions.
A practical, all-year workflow
The traders who find tax season least painful treat it as a year-round discipline rather than an April scramble: keep trade history synced and reconciled continuously, label corporate actions and transfers as they happen, periodically review P&L under the relevant accounting method, and keep a tidy export ready to hand to a professional. The objective is to arrive at the CPA's office with complete, accurate records and a clear question list — not a box of disorganized statements and a hope that the software figured it out.
Key takeaways
Trader tax status is a fact-and-circumstances determination, not a checkbox; the wash-sale rule turns frequent trading into a serious recordkeeping problem; a Section 475(f) mark-to-market election is powerful but procedurally strict and consequential; and software's proper role is organizing records and exports, not computing liability or advising. None of this is tax advice — consult a qualified CPA and rely on IRS primary sources before acting.
This article is educational and is not investment, legal, accounting, or tax advice.