I'd be interested in recent experiences from anyone with an individual 401k account at Interactive Brokers, especially regarding the legal document provider or any other service used to maintain the 401k (for example, a record keeping service if you don't do it yourself), such as a provider listed at http://www.401khelpcenter.com/pdf/Solok_Vendor_List.pdf . theonline401k.com charges $215/year + more if you want them to generate tax forms, which is much less than I think I'd save in commissions and make from putting on a few more marginal trades, but I would prefer to deal with a 401k provider that has actually dealt with Interactive Brokers before. For example, one "blog" at http://mysolo401k.blogspot.com/2012/09/self-directed-solo-401k-openning.html mentions, "We have a number of clients who have opened brokerage account for their Solo 401k with Interactive Brokers." I might consider solutions using other low cost brokerages, such as MB Trading or Lightspeed, but I have other accounts at IB, and like the variety of instruments available, even if I don't currently trade strategies that use many of them. Thanks in advance for any help with this.