A conversion of an amount that was previously converted and subsequently recharacterized.
An IRA owner who converts an amount to a Roth IRA during any taxable year and recharacterizes the amount, may not reconvert the amount before the later of the following :
- January 1 following the taxable year in which the amount was converted to a Roth IRA or
- The end of the 30-day period beginning on the day on which the amount was recharacterized
If the amount is reconverted before this period it a failed conversion
Treas. Reg. §1.408A-5, Q&A-9(a)(1)