I use flat rates with IB, trading future. Can someone tell me the break-even daily (or monthly total) contract size to favor any pricing? Also, is the pricing (trading volume) based on a single account? or the master account (combined)? For April, I paid about $900 commissions on the main account and about $1,400 total all accounts combined. So I do not think the tiered pricing would favor me since my volumes are still small. How do you think?