D.C. Code § 47-2319

Any person aggrieved by a final determination of tax or by a denial of a claim for refund, other than a refund of tax finally determined in § 47-2316, may within 6 months from the date of assessment of the deficiency, or from the date of the denial of a claim for refund, appeal to the Superior Court of the District of Columbia in the same manner and to the same extent as set forth in §§ 47-3303 and 47-3304 as amended.