What percentage of non-audit services fee over audit fees that received by the CPA firm from the same client will likely compromise the auditors' independence?

你认为会计师事务所由同一位委讬人身上收到的非审计服务费超过审计费用的多少百分比可能会损害审计师的独立性？

youdao

US-based GAAP and SEC reporting experts in the global audit firms review the workpapers behind the filings for every non-US based audit client that is listed on a US stock exchange, all over the world, before any filing with the SEC.

FORBES: A Legal Secret Weapon May Help Hold Deloitte US Firm Liable for ChinaCast Fraud

In 2002 the Sarbanes-Oxley act limited what kind of non-audit services an American accounting firm can offer to an audit client.

ECONOMIST: The Big Four accounting firms