There are no additional costs for being in a Friends and Family account structure. It is actually a cost saver if the structure fits your trading needs.
1. Sub account volumes are pooled together for the purpose of reaching tiers in our commission schedules.
2. If you have one very active account (your regular trading account), the commissions generated can be applied to a less frequently used account (maybe your IRA) so no accounts are charged a minimum fee.
3. You only pay market data once. Again here, commissions generated for all the accounts go towards the $30.00 required for the US non pro bundle of data.
4. If you buy 200 shares (100 for the individual account, 100 for the IRA) each account is charged $.50. If they were separate, each account would be charged 1.00
Some of our most advanced trading software is implemented in the advisor account. For example, if you get multiple prices on a single order that you have allocated to multiple accounts, IB will give each account an average price so the first account that receives an execution doesn't get a better price than the last one.
If you need more information, you should look on our web site or give us a call.
Sal