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Directory Results for Department of the Treasury - Internal Revenue Service 3949-A OMB Number 1545-1960 Information Referral (July 2013) (See instructions on reverse) Use this form to report suspected tax law violations by a person or a business - sedm to Department of the Treasury - Internal Revenue Service 3949-A OMB Number 1545-1960 Information Referral (March 2014) (See instructions on reverse) Use this form to report suspected tax law violations by a person or a business