Leaderboard

The 390 rule exists to stop professionals from masquerading as non-professional customers and taking advantage of the lower fees and higher order priority to gain a market-making advantage. If you end up crossing the threshold, you will be designated as a Professional and your orders must be handled the same as any other Professional trader. This means that your per-order fees will change according to each exchange's much-more-complicated professional fee schedule, and your orders will be deprioritized when compared to retail orders. Luckily you are with Interactive Brokers, who can handle this designation. Many other brokers cannot and will just cut you off before you reach the threshold. IB will take the professional fees into account when using smart routing, but your overall fees will probably increase significantly regardless. Hope that helps.