Answer:
Generally, bank accounting systems only have the ability to report interest for a given account on one TIN- the one on file at year end. If for some reason ownership of an account changes mid-year, closing out the old account and reopening provides the cleanest way to allocate the interest paid; otherwise, the bank might have to create extra records to generate adjusted (and multiple) 1099's at year end.
First published on BankersOnline.com 10/08/07