Your investment club has an EIN number that is issued by the IRS. It identifies your club and is used on your tax forms and to open any financial accounts you have.

You've probably applied for it, put it where needed and forgotten about it.

Starting in 2014, the IRS has just published new regulations which will require you to update your information on a regular basis. They will want to make sure you have designated a "responsible party" that they can contact if they have any issues relating to your club that they need to address with you. They'll be coming out with a new form and new instructions for the information you'll need to update. We'll pass along links when they are available.

Here is further information, including a link to the new regulation:

http://www.journalofaccountancy.com/News/20137918.htm

Nothing to worry about until 2014, but just a heads up that something is coming you'll need to address.