Toshiba Corp. President Hisao Tanaka is expected to step down to take responsibility for accounting irregularities, sources familiar with the matter said Saturday.

Tanaka's resignation will be finalized after a third-party panel tasked with investigating the scandal releases its report as early as next week. The panel has found the 64-year-old president put heavy pressure on subordinates to achieve profit targets, the sources said.

Sources say the electronics maker may have overstated around ¥200 billion ($1.6 billion) in its group operating profits in its mainstay infrastructure-related, semiconductor, television and personal computer businesses for the five years to March 2014.