For example, assume an electing corporation incurs $50 of debt, distributes the $50 of proceeds to its shareholder, and immediately after the distribution, the electing corporation's gross asset value is below the net value floor by $25. The electing corporation may avoid the inclusion of its remaining deferred COD income if value of at least $25 is restored to it before the due date of the electing corporation's tax return (including extensions) for the taxable year that includes the distribution. The value that must be restored is determined at the time of the impairment transaction on a net value basis (for example, additional borrowings by an electing corporation do not restore value).
26 C.F.R. §1.108(i)-1