26 U.S.C. § 4424
(a) General rule Except as otherwise provided in this section, neither the Secretary nor any other officer or employee of the Treasury Department may divulge or make known in any manner whatever to any person—
(b) Permissible disclosure A disclosure otherwise prohibited by subsection (a) may be made in connection with the administration or civil or criminal enforcement of any tax imposed by this title. However, any document or information so disclosed may not be—
(c) Use of documents possessed by taxpayer Except in connection with the administration or civil or criminal enforcement of any tax imposed by this title—
shall not be used against such taxpayer in any criminal proceeding.
(Added Pub. L. 93–499, § 3(c)(1), , 88 Stat. 1550; amended Pub. L. 94–455, title XII, § 1202(h)(6), title XIX, § 1906(b)(13)(A), , 90 Stat. 1688, 1834.)
Amendments 1976—Subsec. (a). Pub. L. 94–455, § 1906(b)(13)(A), struck out “or his delegate” after “Secretary” wherever appearing.
Subsec. (d). Pub. L. 94–455, § 1202(h)(6), substituted “6103(f)” for “6103(d)”.
Effective Date of 1976 Amendment Amendment by section 1202(h)(6) of Pub. L. 94–455 effective , see section 1202(i) of Pub. L. 94–455, set out as a note under section 6103 of this title.
Effective Date Section effective , and applicable only with respect to wagers placed on or after such date, see section 3(d)(1) of Pub. L. 93–499, set out as an Effective Date of 1974 Amendment note under section 4401 of this title.