Under its ultra-loose monetary policy, the BOJ guides short-term rates towards -0.1%, eroding profit margins at financial institutions.

"(Charging fees) is something for the banking industry as a whole to think about," Sumitomo Mitsui Trust Bank President Masaru Hashimoto told the Sankei in an interview, according to the paper.

If negative rates deepen, Sumitomo Mitsui Trust "will also consider it," Hashimoto said.

The BOJ is due to announce its policy decision on Thursday after a two-day board meeting, where deepening negative rates is expected to be an option if it were to ease.

(Reporting by Chang-Ran Kim in Tokyo; Editing by Stephen Coates)