Final answer:
When a CPA firm discovers a likely illegal act while preparing audited financial statements for an SEC filing, they must first report it to the company's management. If management does not respond appropriately, the issue should then be raised with the audit committee. This procedure aligns with corporate governance measures designed to protect investors from accounting fraud.
Step-by-step explanation:
Under Section 10A of the Securities Exchange Act of 1934, when a CPA firm preparing audited financial statements for an SEC filing discovers an illegal act, the initial step they should take is to inform the company's management about their findings. The intention here is to give the company's management the opportunity to investigate the matter and take appropriate action. If the management does not adequately address the CPA firm's concerns, they would then be required to escalate the issue to the company's audit committee. There is a clear sequence of reporting that must be followed, starting with management and potentially moving up to higher levels of governance, to ensure that the company has the opportunity to correct the issue internally before it becomes a matter for external oversight by the SEC or shareholders. This process is in line with the principles of corporate governance established to protect investors from accounting fraud and to ensure that they have accurate financial information about a company's operations.