300+ trades is strong evidence for TTS, especially if you were trading almost daily and holding for short periods. You'd want to document:
- Trading was substantial and regular (4+ hours/day, 4+ days/week)
- Trades were frequent (you're well above the typical threshold)
- Holding periods were short (day trading and swing trading support this)
- You were seeking profit from short-term price movements, not long-term appreciation
On the loss carryforward: here's the tricky part. Your 2024 losses are Section 1256 capital losses. When you elect 475(f) MTM, it only applies going forward. Your existing capital loss carryforwards remain as capital losses - they don't convert to ordinary losses.
So you'd have $177K of capital loss carryforward that can offset future capital gains, but if all your 2026+ trading is MTM ordinary income, you won't have capital gains to offset. You'd still be stuck with the $3K/year limitation.