Except where such authority is expressly given by this title to any person other than an officer or employee of the Treasury Department, the Secretary shall prescribe all needful rules and regulations for the enforcement of this title, including all rules and regulations as may be necessary by reason of any alteration of law in relation to internal revenue.
Paragraph (1) shall not apply to regulations filed or issued within 18 months of the date of the enactment of the statutory provision to which the regulation relates.
The Secretary may provide that any regulation may take effect or apply retroactively to prevent abuse.
The Secretary may provide that any regulation may apply retroactively to correct a procedural defect in the issuance of any prior regulation.
The limitation of paragraph (1) shall not apply to any regulation relating to internal Treasury Department policies, practices, or procedures.
The limitation of paragraph (1) may be superseded by a legislative grant from Congress authorizing the Secretary to prescribe the effective date with respect to any regulation.
The Secretary may provide for any taxpayer to elect to apply any regulation before the dates specified in paragraph (1).
The Secretary may prescribe the extent, if any, to which any ruling (including any judicial decision or any administrative determination other than by regulation) relating to the internal revenue laws shall be applied without retroactive effect.
The Secretary shall prepare and distribute all the instructions, regulations, directions, forms, blanks, stamps, and other matters pertaining to the assessment and collection of internal revenue.
Except to the extent otherwise provided by this title, any election under this title shall be made at such time and in such manner as the Secretary shall prescribe.
Any temporary regulation issued by the Secretary shall also be issued as a proposed regulation.
Any temporary regulation shall expire within 3 years after the date of issuance of such regulation.