Interesting question. I am confident that your examiner would argue that the total should appear on the January statement. I am also confident that the wording of Comment 11(a)(3)-1 says exactly what you have said: "...starting the first statement period that begins after January 1, 2010." I think you'd have a good logical argument that the Comment means the applicable statement period would start on February 1.
As a practical matter, try to get this done for the January statement if you can. You can debate with your examiner over more important things. On the flip side, there aren't any onerous penalties for compliance errors under Reg. DD.
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John S. Burnett
BankersOnline.com
Fighting for Compliance since 1976
Bankers' Threads User #8