Akumochizake is classified as 'other liquor' under Japan's Liquor Tax Act however it is considered a 'liquor designated as a type of sake similar to mirin' in Article 3-21 of the Liquor Tax Act and is subject to the same reduced tax rate as mirin which is 20,000 yen per kiloliter.
灰持酒は酒税法上の品目は雑酒であるが、酒税法3条21号の「みりんに類似する酒類として政令で定めるもの」に該当しみりんと同額の課税（1キロリットル当たり2万円）の軽減税率を受けている。