Perhaps some clarification would be helpful here as this thread appears to involve discussion of various grouped account structures offered by IB, one being a 'linked' account type another a 'Friends & Family' account type and a third a âSeparate Trading Accountâ.
To start, a linked account is intended to facilitate ease of operation of multiple accounts belonging to the same beneficial owner (same name and taxpayer identification number). Thus, for example, if one maintained an individual trading account, a Roth IRA account and a Traditional IRA account, all could be linked (a joint account cannot be linked to an individual account at this time). The primary benefits of doing so would include a single user ID, password and security device through which all accounts could be accessed and a single market data subscription which would be accessible to all accounts. It's important to note that each account is funded separately, margined separately (including PDT calculations) and is subject to its own monthly minimum activity fee. Operationally, once the account holder logs in to the trading platform or Account Management, they are presented with a drop down list of the linked accounts and need to specify the account for which orders are submitted or administrative tasks performed.
A new linked account can be opened by either selecting the Account Administration and then Link Existing Account menu options in Account Management or by selected the 'Open an Account' button from the IB home page and entering the same email address as on the existing account. If the account holder already has multiple eligible accounts which were opened prior to the availability of linkage, they may be linked by selecting the Account Management menu options referenced above. For additional information regarding the steps to link an account type KB1319 into the search engine on the IB home page. Information regarding the selection of a market data billing account can be found at KB1684 and general FAQs at KB1467.
In comparison, the Friends & Family account type is designed to accommodate trading on behalf of multiple beneficial owners (e.g., family members) by a single individual. This account is a variant of the professional advisor account structure and involves a master account through which all trading is conducted, with trades being pre-allocated to the sub-accounts. As trading is generally not conducted through the sub-accounts, trading platform access is not needed nor is market data. Accordingly, any market data subscriptions would be provided and billed to the master account user.
In addition, each account, including the master, is subject to a monthly activity minimum, however, there are provisions for waiver based upon aggregate activity (see website for example). As this account structure is intended for multiple beneficial owners, each sub-account is provided access to a version of Account Management which is not accessible by the master and which provides for the logical separation of administrative tasks unique to that owner (e.g., account funding, maintenance of individual information and access to statement). Finally, as is the case with linked accounts, each Friends & Family sub-account is funded and margined separately.
The Separate Trading Account structure is intended for proprietary trading groups and likewise provides for a master account and sub-accounts, however all are part of the same legal entity. In this account type, funds are deposited in the master account and transferred between the master and sub-accounts to control individual trader limits. Initial margining is determined for each sub-account, while maintenance margining is determined at a consolidated account level. In terms of market data, subscriptions are billed to the master account but are assessed based upon subscription elections of each individual sub-account user. Here, monthly activity minimums are determined in the same manner as the Friends & Family account structure.
Hope this is helpful.