Not a regulatory requirement, but I use the end of the year as a good time for cleaning out my files to send things to record storage. That way I can be sure I haven't overlooked something in a pending file that needs to be taken care of before year end.
In addition to the Reg O, HMDA, CRA LAR and BSA exemption tasks listed above, I also start investigating potential CRA Sunshine agreements for reporting about now.
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Opinions my own.