Regulatory structure around frequent trading
The pattern day trader (PDT) rule, enforced by FINRA through brokerages, applies to margin accounts and generally requires a minimum equity balance of $25,000 if a trader executes four or more day trades within five business days; falling under that threshold without meeting the equity minimum can restrict further day trading in the account, a structural constraint worth understanding before building a strategy around frequent same-day trades. Traders who qualify as engaging in a trade or business of trading, and who meet specific IRS criteria around frequency, continuity, and intent, can consider a mark-to-market election under Section 475(f), which changes how gains and losses are treated for tax purposes, including exemption from the wash-sale rule for those positions and more flexible deduction of trading losses against other income—a specific, consequential election that benefits from a tax professional's review.