Answer:
An IRA custodian has "naked possession" of the assets; i.e., he/she/it does not have investment authority. The common example would be a bank whose IRA investments are limited to its own deposits.
An IRA trustee generally is empowered to make investment decisions. An example would be a bank trust department, where a large QRP has been rolled over into an IRA. The trustee may be empowered to buy and sell a wide array of investments within pre-established boundaries or at its own discretion. Oftentimes, the terms are not used with precision.
First published on BankersOnline.com 1/04/10