It's not well known that all Solo 401ks are technically approved by the IRS not the Solo 401k Provider. The IRS Solo 401k approval process entails the IRS issuing determination letter confirming that the Solo 401k Plan is a Prototype Plan meeting the IRS Qualified Plan Rules. Further the IRS rules allow for any of the following to be the Trustee of their Solo 401k: 1. Business owner, 2. employee, 3. financial or trust institution Visit following IRS page to learn more about who may serve as trustee of Solo 401k. http://www.irs.gov/retirement/sponsor/article/0,,id=151923,00.html Click on Solo 401k to learn more about Solo 401k.