tax returns or portions thereof (including information returns and other written statements) filed with the Commissioner of Internal Revenue under title VIII of the Social Security Act, under subchapter E of chapter 1 or subchapter A of chapter 9 of the Internal Revenue Code of 1939, under chapter 2 or 21 of the Internal Revenue Code of 1954 or the Internal Revenue Code of 1986, or under regulations made under authority of such title, subchapter, or chapter;

assessments of amounts due under an agreement pursuant to section 418 of this title (as in effect prior to December 31, 1986 ), if such assessments are made within the period specified in subsection (q) 1 of such section (as so in effect), or allowances of credits or refunds of overpayments by a State under an agreement pursuant to such section;

except that no amount of self-employment income of an individual for any taxable year (if such return or statement was filed after the expiration of the time limitation following the taxable year) shall be included in the Commissioner’s records pursuant to this subparagraph;