Final answer:
The professional bondsman's monthly report must be filed with the Commissioner by the 15th day of each month to ensure compliance with regulatory requirements.
Step-by-step explanation:
The professional bondsman's monthly report must be filed with the Commissioner by the 15th day of each month. This report provides detailed information about the bondsman's activities, including the number of bonds written and surrendered, the amount of premiums collected, and any outstanding liabilities. Filing the report on time is crucial to ensure compliance with the regulatory requirements and to avoid any penalties or fines.