In 1902-1903, Pokrovsky was a deputy chairman (chairman from 1904) of the Department of Taxation of the Ministry of Finance. In 1906, he was appointed deputy finance minister and mainly oversaw taxation affairs. In 1914-1916, Pokrovsky was a member of the State Council (retaining his post of the deputy finance minister until July 1914).
From 1902 to 1903, Pokrovsky was a deputy chairman in charge of the Department of Taxation at the Ministry of Finance. In 1906, he became an assistant finance minister and focused on tax administration. Between 1914 and 1916, Pokrovsky was part of the State Council (remaining as deputy finance minister until July 1914).