O.C.G.A. § 48-5-162

For a violation of any of the provisions of subsection (a) of Code Section 48-5-161, the tax collector or tax commissioner so violating shall forfeit all or such part of his commissions as the grand jury of the county shall recommend. If the tax collector or tax commissioner fails to pay over the penalty imposed, it shall be enforced against the tax collector or tax commissioner and his sureties by the commissioner as provided by law for defaulting tax collectors, and a 20 percent penalty of the amount of the penalty set by the grand jury shall be added to such penalty.