For the purpose of ascertaining the correctness of any tax return, making an assessment where no tax return has been made, determining the liability of any person, firm or corporation for any taxes or fees of any nature whatsoever that may be due or owing to the state of Tennessee, or for determining the liability at law or in equity of any transferee or fiduciary of any person, firm or corporation with respect of any taxes or fees due or owing to the state of Tennessee, or collecting any such liability, the commissioner of revenue, the comptroller of the treasury, or their duly authorized representatives, are authorized to: