Although Okura-sho (Ministry of Finance) under the Okura-sho ritsuryo sei (the political system based on the codes of the Ministry of Finance) also worked as an organization engaged in finance, Minbu-sho was considered a more important ministry than Okura-sho because the former handled land taxes and family registers related to the land taxes.
財政官庁として他に大蔵省律令制における大蔵省があったが租税や租税関係の戸籍はこちらが取り扱ったため大蔵省よりも重視された。