Employers are responsible for paying social security, Medicare, and federal and/or state income taxes on behalf of their employees. If an employer misclassifies an employee, they are violating wage, tax, and employment eligibility laws. Doing so can incur fines and/or legal action from the US Department of Labor (DoL), the Internal Revenue System (IRS), as well as state agencies. Employers are also required to file payroll taxes and may be fined for failing to do so if they are misclassifying employees.
Additionally, employers must have I-9 forms on record for each individual employee to provide their employment eligibility. If you have misclassified an employee as an independent contractor, you may be fined for not retaining their I-9 forms on record.
Failure to pay for any fines or employee back-taxes, as well as being found to be deliberately misclassifying employees, may result in criminal or civil proceedings.