Summary

Frank Murphy Magruder v. Supplee — Opinion of the Court

A tax lien is an encumbrance upon the land, and payment, subsequent to purchase, to discharge a pre-existing lien is no more the payment of a tax in any proper sense of the word than is a payment to discharge any other encumbrance, for instance a mortgage. It is true that respondents here could not have retained the properties unless the taxes were paid, but it is also true that they could not retain them without paying the purchase price.
Source: Wikisource

Frank Murphy Magruder v. Supplee — Opinion of the Court

Thus either a pre-existing tax lien or personal liability for the taxes on the part of a vendor is sufficient to foreclose a subsequent purchaser, who pays the amount necessary to discharge the tax liability, from deducting such payment as a 'tax paid'. Where both lien and personal liability coincide, as here, there can be no other conclusion than that the taxes were imposed on the vendors.
Source: Wikisource

Frank Murphy Magruder v. Supplee — Opinion of the Court

It is no answer therefore to say that the property was burdened with the taxes and that respondents became obligated to pay them. There was a burden, but it was contractually assumed. In discharging this assumed obligation respondents were not paying taxes imposed upon them within the meaning of Section 23 (c) . For 'only the person owning the property at that time (i.e., when the tax lien attaches) is subjected to the burden which the law imposes; and only the person who has been thus subjected to the burden of the tax is entitled to a deduction for paying it.
Source: Wikisource

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