The bank could have a problem, too. You want to make certain that checks are deposited to an account in the payee name. How do you police that with a multi-owner account? Multiple commercial owners also causes problems with FDIC insurance coverage. They don't recognize joint owners (for insurance purposes) that are not natural persons.
Besides Tom's suggestion, the customer can also have problems sorting everything out at year end for accounting and tax purposes. Even though he can report single-member LLC earnings on his own 1040, he needs to include a separate schedule for each LLC.
Finally, don't forget that one of your customer's goals may simply be to save on the bank's fees. That may be a good idea for him, but not for you.
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John S. Burnett
BankersOnline.com
Fighting for Compliance since 1976
Bankers' Threads User #8