After imposition of the penalty under this subsection, the amount of the penalty, if not paid within 30 days of receipt of notice of such penalty, shall bear interest at the rate of one percent per month or fraction thereof until the penalty has been paid.
Any person who fails to pay the Commissioner on a timely basis the amount of taxes due under this chapter shall also be subject to a civil penalty. The amount of the civil penalty shall be equal to 10 percent of the tax due or $50, whichever is greater; however, penalties resulting from an audit shall be equal to 10 percent of the tax due.
After imposition of the civil penalty under this subsection, the amount of the penalty, if not paid within 30 days of receipt of notice of such penalty, shall bear interest at the rate of one percent per month until both tax and penalty have been paid.
Va. Code § 58.1-2299.6