As found at the bottom of the CTR instructions on the form:
Paperwork Reduction Act Notice. The requested information
is useful in criminal, tax, and regulatory investigations and
proceedings. Financial institutions are required to provide
the information under 31 U.S.C. 5313 and 31 CFR Chapter X,
commonly referred to as the Bank Secrecy Act (BSA). The BSA
is administered by the U.S. Department of the Treasury’s
Financial Crimes Enforcement Network (FinCEN). You are
not required to provide the requested information unless a form
displays a valid OMB control number. The time needed to
complete this form will vary depending on individual
circumstances. The estimated average time is 19 minutes. If you
have comments concerning the accuracy of this time estimate or
suggestions for making this form simpler, you may write to the
Financial Crimes Enforcement Network, P. O. Box 39,
Vienna, VA 22183. Do not send this form to this office. Instead, see When and Where to File in the instructions.
Emphasis mine.
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My opinions do not necessarily reflect those of my employer.