Whenever the personal representative of any estate fails to pay the amount of tax assessed against the estate, plus interest on the tax, pursuant to Code Section 48-12-5 within 30 days after notice from the commissioner as to the amount to be paid or whenever the personal representative timely files a duplicate return as required by Code Sections 48-12-2 and 48-12-3 but fails to pay the state estate tax due on or before the filing, the commissioner shall issue an execution against the estate for the amount of the tax, plus interest due on the tax to the date of the issuance of execution and the amount of any penalty as provided in this Code section. The execution shall be enforced by levy and sale and shall bear interest on the amount of the tax at the rate specified in Code Section 48-2-40 from the date of execution until paid. An additional penalty in an amount equal to 10 percent of the amount of the credit for state death taxes as finally determined for federal estate tax purposes shall be paid by the personal representative of the estate to the commissioner for failure to file a duplicate of the federal estate tax return as required by Code Sections 48-12-2 and 48-12-3 or for failure to pay the tax within 30 days after notice from the commissioner as to the amount to be paid.