Which of the following is NOT considered an involuntary lien?

A mortgage lien is not considered an involuntary lien because it is a type of voluntary lien. When a property owner voluntarily borrows money to purchase property, they agree to place a mortgage on that property as security for the loan. This agreement is initiated by the property owner and, therefore, is classified as voluntary.

In contrast, involuntary liens arise without the property owner's consent, often due to legal actions or obligations. For example, a contractor's lien (or mechanic's lien) comes into play when a contractor files a claim against a property because they were not paid for labor or materials provided. A property tax lien is imposed by the government when property taxes are not paid, reflecting the obligation of the property owner to fulfill their tax responsibilities. Similarly, a judgment lien is placed against a property when a court rules that a creditor is entitled to collect a debt, often as a result of a lawsuit.

Thus, the key aspect distinguishing a mortgage lien from these other types of liens is the voluntary nature of the agreement made by the property owner, which does not apply to the involuntary liens that arise from external actions or obligations.