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(a) Requirement. Any individual who within the calendar year makes any transfers by gift (except those under which section 24 are not to be included in the total amount of gifts for such year) shall make a return under oath in duplicate. The return shall set forth (1) each gift made during the calendar year under which section 24 is to be included in computed net gifts; (2) the deductions claimed and allowable under section 25; (3) such further information as may be required by regulations made pursuant to law.\n(b) Time and place for filing. The return shall be filed on or before the 15th day of March following the close of the calendar year.