Almost 1 year ago, a US Tax Court ruled against the IRS and declared that the stock gained through demutualization retained its IPO basis ($27.50) rather than the 0 as the IRS had claimed. However, as I understand it, the IRS can appeal the decision.
If you were doing a Schedule D today, would you choose the $27.50 or be safe with $0 for the basis?
What would need to happen if someone chose the $27.50 and the IRS later (possibly several years later) won the appeal?