A US corporate reform law known as Sarbanes-Oxley has become a major compliance issue with mainland companies that are listed or are planning to list in the United States.
Accounting firms are benefiting as Chinese companies, including subsidiaries of US listed firms, scramble to comply with the new accounting regulations ahead of the deadline.
The Sarbanes-Oxley Act of 2002 was created following major US accounting scandals that led to the collapse of Enron and WorldCom.
The Act brings in accounting reforms and requires all US listed companies and their overseas subsidiaries to have proper internal controls in place to prevent corporate frauds and false accounting.
Sarbanes-Oxley compliance has become a major business for Deloitte Touche Tohmatsu's mainland operations in the coming year, according to its China chief executive Peter Bowie.
Mr Bowie describes the rush to meet Sarbanes-Oxley regulations as the biggest one-off event boosting business for accountants since the Y2K episode.
'As the deadline is looming, we have seen substantial demand from mainland firms and multinational companies on Sarbanes-Oxley compliance,' he said.