A report by the Audit Court found that executives at state-owned banks had earned as much as 622 million rials (USD 20,000) per month - compared to average public sector salaries of USD 400.
Ali Larijani, the parliament speaker, said the salaries were "a stain" on Iran's public sector, and that legal cases had been opened against all 397 officials who earned more than 200 million rials.
"I hope (the report) will be the source of fundamental reform in the country so that individuals cannot take advantage (of the system)," he said, according to the Fars news agency.
The scandal broke in May when leaked payslips were published by conservative media outlets. Including bonuses, one bank director was shown to have earned USD 60,000 a month.
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It was considered a major blow to President Hassan Rouhani, a moderate who came to power in 2013 promising to tackle the vast corruption in Iran's institutions.
Several executives were sacked and the entire management of Iran's development fund forced to resign following the leaks, while the government announced a cap on public sector salaries of 189 million rials, and 100 million rials for those in political roles.