(a) Each corporation subject to this article which fails to file timely the returns required by this article shall become liable for a penalty of 10 percent of the tax. The penalty shall be collected in the same manner as the tax is collected. The commissioner shall have the authority to extend the time for filing the return when good cause for the extension is shown.

(b) Should the tax imposed by this article remain unpaid after the date prescribed for payment, the delinquent corporation liable for the tax shall be subject to and shall pay, in addition to other penalties incurred, a penalty of 10 percent of the tax for failure to pay the tax when due.

(c) Any tax imposed by this article which remains unpaid after the date prescribed for payment shall bear interest at the rate specified in Code Section 48-2-40 until paid. The interest shall be in addition to all other penalties prescribed by law and shall be collected in the same manner as the tax imposed by this article.