No action is permitted under 26 U.S.C. 7426(a)(1) unless there has been a levy upon the property claimed.
For purposes of paragraph (b)(1) of this section, a levy is wrongful against a person (other than the taxpayer against whom the assessment giving rise to the levy is made), if the levy is upon property exempt from levy under 26 U.S.C. 6334 , or the levy is upon property in which the taxpayer had no interest at the time the lien arose or thereafter, or the levy is upon property with respect to which such person is a purchaser against whom the lien is invalid under 26 U.S.C. 6323 or 6324(a)(2) or (b) , or the levy or sale pursuant to levy will or does effectively destroy or otherwise irreparably injure such person's interest in the property which is senior to the Federal tax lien. A levy may be wrongful against a holder of a senior lien upon the taxpayer's property under certain circumstances although legal rights to enforce the holder's interest survive the levy procedure. For example, the levy may be wrongful against such a person if the property is an obligation which is collected pursuant to the levy rather than sold and nothing thereafter remains for the senior lienholder, or the property levied upon is of such a nature that when it is sold at a public sale the property subject to the senior lien is not available for the senior lienholder as a realistic source for the enforcement of the holder's interest. Some of the factors which should be taken into account in determining whether property remains or will remain a realistic source from which the senior lienholder may realize collection are: The nature of the property, the number of purchasers, the value of each unit sold or to be sold, whether, as a direct result of the distraint sale, the costs of realizing collection from the security have or will be so substantially increased as to render the security substantially valueless as a source of collection, and whether the property subject to the distraint sale constitutes substantially all of the property available as security for the payment of the indebtedness to the senior lienholder.
27 C.F.R. § 70.207
26 U.S.C. 7426