The ior once had more than 30,000 account holders, ranging from private entities to Catholic missionaries around the world.
When the ior published its annual report (PDF) for the first time last year, they did little to ease the minds of the skeptical.
Major financial institutes, including JP Morgan, ceased doing business with the ior in 2012 because of a lack of transparency.
The ior has been the subject of great scrutiny and scandal for decades.
But ior spokesman Max Hohenberg said the plan was ridiculous.