Each commissioner shall begin annually, on the first day of January, to discharge the duties prescribed by law. As part of his duties each commissioner of the revenue shall ascertain and assess, at fair market value, all subjects of taxation in his county or city on the first day of January in each year, except as otherwise provided by law. For each such assessment of local mobile property tax as defined in § 58.1-3983.1, prior to the time that any tax with respect to such assessment is due, the commissioner or other local tax official shall provide in writing to each applicable taxpayer:
Va. Code § 58.1-3103