Interactive Brokers has been one of my main brokers since 2007. Yet I didn’t realize until today that you can customize the smart routing of orders. I was trying to figure out how to set a hotkey to set a market/ECN destination (route) and stumbled across the smart routing configuration which is even better than what I was looking for. Read IB’s description of how it works.
The simple explanation is that you can set the smart router to prioritize execution (in various ways) or prioritize ECN rebates. This only affects orders where you are adding liquidity (when you are taking liquidity the smart routing always prioritizes execution). For someone who trades a lot of low-priced stocks, ECN fees and IB’s per share commissions add up fast. By setting my smart routing to always go to the highest rebate venue I will dramatically lower my trading fees on low-priced stocks. Simply put, I should have looked into this long ago and saved thousands of dollars in commissions.
For the record, for adding liquidity on Nasdaq stocks under $1, the best route is NSX, which offers a rebate of 0.25% of the trade value.
Here is a screenshot of how I have my smart routing configured now: