Since Arai witnessed widespread bribery and arbitrary decision and execution by Shigehide OGIWARA who was dismissed, Arai revived Kanjoginmiyaku in 1712 that was abolished by Ogiwara earlier and assigned Yoshitsura SUGIOKA and Yoshimasa OGIWARA (both of them became kanjo bugyo [commissioner of finance] later) and strived for tightening up the official discipline in the finance ministry.
賄賂の横行や罷免された荻原重秀の独断専行を目の当たりにしていた新井は先に荻原が廃止した勘定吟味役を正徳2年（1712年）に再度設置し、杉岡能連、萩原美雅（ともにのち勘定奉行）を任命し、勘定所自体の綱紀の引き締めを図った。