(a) The amount of any penalty or assessment which has become final under section
3803 of this title, or for which a judgment has been entered under section
3805 (e) or
3806 of this title, or any amount agreed upon in a settlement or compromise under section
3803 (j) or
3806 (f) of this title, may be collected by administrative offset under section
3716 of this title, except that an administrative offset may not be made under this subsection against a refund of an overpayment of Federal taxes, then or later owing by the United States to the person liable for such penalty or assessment.