You have hired someone to do work for you. Is that person an employee or an independent contractor?
The answer is important because misclassifying an employee as an independent contractor, whether intentionally or through ignorance, can land you in court and in debt for payroll taxes.
There are several tests from a variety of regulatory agencies that are used to try to determine employment status and occasionally changes are made to the standards. Even if you classified certain of your workers correctly before, you might need to revisit the question to ensure you remain in compliance.