If an individual who, but for paragraph (1)(C), would be relieved of liability under paragraph (1), establishes that in signing the return such individual did not know, and had no reason to know, the extent of such understatement, then such individual shall be relieved of liability for tax (including interest, penalties, and other amounts) for such taxable year to the extent that such liability is attributable to the portion of such understatement of which such individual did not know and had no reason to know.
For purposes of this subsection, the term “understatement” has the meaning given to such term by section 6662(d)(2)(A).
Except as provided in this subsection, if an individual who has made a joint return for any taxable year elects the application of this subsection, the individual’s liability for any deficiency which is assessed with respect to the return shall not exceed the portion of such deficiency properly allocable to the individual under subsection (d).
If the Secretary demonstrates that an individual making an election under this subsection had actual knowledge, at the time such individual signed the return, of any item giving rise to a deficiency (or portion thereof) which is not allocable to such individual under subsection (d), such election shall not apply to such deficiency (or portion). This subparagraph shall not apply where the individual with actual knowledge establishes that such individual signed the return under duress.
The term “disqualified asset” means any property or right to property transferred to an individual making the election under this subsection with respect to a joint return by the other individual filing such joint return if the principal purpose of the transfer was the avoidance of tax or payment of tax.
For purposes of clause (i), except as provided in subclause (II), any transfer which is made after the date which is 1 year before the date on which the first letter of proposed deficiency which allows the taxpayer an opportunity for administrative review in the Internal Revenue Service Independent Office of Appeals is sent shall be presumed to have as its principal purpose the avoidance of tax or payment of tax.
The portion of any deficiency on a joint return allocated to an individual shall be the amount which bears the same ratio to such deficiency as the net amount of items taken into account in computing the deficiency and allocable to the individual under paragraph (3) bears to the net amount of all items taken into account in computing the deficiency.
If an item of deduction or credit is disallowed in its entirety solely because a separate return is filed, such disallowance shall be disregarded and the item shall be computed as if a joint return had been filed and then allocated between the spouses appropriately. A similar rule shall apply for purposes of section 86.
Except as otherwise provided in section 6851 or 6861, no levy or proceeding in court shall be made, begun, or prosecuted against the individual making an election under subsection (b) or (c) or requesting equitable relief under subsection (f) for collection of any assessment to which such election or request relates until the close of the 90th day referred to in subparagraph (A)(ii), or, if a petition has been filed with the Tax Court under subparagraph (A), until the decision of the Tax Court has become final. Rules similar to the rules of section 7485 shall apply with respect to the collection of such assessment.
Notwithstanding the provisions of section 7421(a), the beginning of such levy or proceeding during the time the prohibition under clause (i) is in force may be enjoined by a proceeding in the proper court, including the Tax Court. The Tax Court shall have no jurisdiction under this subparagraph to enjoin any action or proceeding unless a timely petition has been filed under subparagraph (A) and then only in respect of the amount of the assessment to which the election under subsection (b) or (c) relates or to which the request under subsection (f) relates.
The Tax Court shall establish rules which provide the individual filing a joint return but not making the election under subsection (b) or (c) or the request for equitable relief under subsection (f) with adequate notice and an opportunity to become a party to a proceeding under either such subsection.
An individual who elects the application of subsection (b) or (c) or who requests equitable relief under subsection (f) (and who agrees with the Secretary’s determination of relief) may waive in writing at any time the restrictions in paragraph (1)(B) with respect to collection of the outstanding assessment (whether or not a notice of the Secretary’s final determination of relief has been mailed).
In the case of a person who is prohibited by reason of a case under title 11, United States Code, from filing a petition under paragraph (1)(A) with respect to a final determination of relief under this section, the running of the period prescribed by such paragraph for filing such a petition with respect to such final determination shall be suspended for the period during which the person is so prohibited from filing such a petition, and for 60 days thereafter.
In the case of any election under subsection (b) or (c) or of any request for equitable relief under subsection (f), if a decision of a court in any prior proceeding for the same taxable year has become final, such decision shall be conclusive except with respect to the qualification of the individual for relief which was not an issue in such proceeding. The exception contained in the preceding sentence shall not apply if the court determines that the individual participated meaningfully in such prior proceeding.
No credit or refund shall be allowed as a result of an election under subsection (c).