One Person Company (OPC) is required to fulfill specific annual compliance requirements to maintain its legal status and avoid penalties. These include filing annual returns (Form MGT-7A), financial statements (Form AOC-4), and adhering to tax regulations. Additionally, an OPC must conduct board meetings, maintain proper financial records, and comply with GST and TDS filings if applicable. Staying compliant ensures smooth business operations, enhances credibility, and prevents legal issues.