If a deed to secure debt reflects an amount secured, that is greater than the principal amount of the note, and the description of the note contained in the security instrument does not clearly indicate what part of the face amount of the note is principal and what part represents other charges, the holder may at the time of recording, present a sworn affidavit itemizing the principal amount of the note and the other charges. The collecting officer shall then use the principal amount from the sworn affidavit in determining the proper tax liability.
Ga. Comp. R. & Regs. R. 560-11-8-.10
O.C.G.A. Sec. 48-6-61.