N.C. Gen. Stat. § 43-46
It shall be the duty of the tax collector of each taxing unit, not later than June 30 following the date the taxes became delinquent, to file an exact memorandum of the delinquency, if any, of any registered land for the nonpayment of the taxes or assessments thereon, including interest, in the office of the register of deeds for registration; and if such officer fails to perform such duty, and there shall be subsequent to such day a transfer of the land as hereinbefore provided, the grantee shall acquire a good title free from any lien for such taxes and assessments, and the collector and his sureties shall be liable for the payment of the taxes and assessments with the interest thereon. The register of deeds shall enter the notice of delinquency on the record copy of the certificate of title, and the tax lien shall be valid against the registered estate from the time it is noted on the record copy. The register of deeds shall enter the notice of cancellation of the tax lien on the record copy of the certificate of title upon presentation of satisfactory evidence of payment.
N.C. Gen. Stat. § 43-46