Just like any other taxpayer, a trading entity can have TTS status if qualified. However, an entity IS NOT necessary for earned income.
An individual with TTS can use Schedule C with several explanatory and specific footnotes to generate earned income. GreenTraderTax developed the method many years ago with much success. An entity is streamlined and clearer to the IRS.
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From:
https://greentradertax.com/business-traders-maximize-tax-benefits-with-an-s-corp/
Plus, a sole proprietor cannot pay himself a salary or fee to generate self-employment income (SEI) or earned income, which is required for AGI deductions including health insurance and retirement plans.
Traders need an entity to financially engineer earned income for health and retirement plan deductions.