Va. Code § 15.2-409
The board may by resolution require the commissioner of revenue of such county to prepare and make all tax bills, in accord with all items shown on the land books, personal property books and income assessment books for the current year, and deliver the bills to the treasurer of the county at the time the land books, personal property books and income assessment books are delivered to such treasurer under general law. Such requirement shall not be effective, however, until the board has first installed in the office of the commissioner of revenue a suitable machine by which the tax bills may be prepared and made out simultaneously with the preparation and making out of the books. The board may prescribe the form of the tax bills and require the commissioner of revenue to destroy all unused tax bill forms in the presence of the board or a committee of its members appointed by its chairman. When the board has adopted such resolution and certified it to the county treasurer, he shall be relieved of all duties and responsibility in reference to the preparation of the bills.
Va. Code § 15.2-409