Example 1. A third-party summons is issued to a bank to determine the amount held in an account in the name of A, against whom unpaid income taxes have been assessed. Notice of the summons is not required to be given to A or any other persons identified in the summons because the summons is issued in connection with the collection of taxes that have been assessed.
Example 2. A third-party summons is issued to determine whether assessments should be made against A, who is potentially liable for a trust fund recovery penalty under section 6672 with respect to the assessed but unpaid withholding tax liability of employer E. The summons is captioned: In the matter of A. Notice of the summons must be provided to A and to any other persons identified in the summons because the summons was issued with respect to A's potential, unassessed liability under section 6672.
26 C.F.R. §301.7609-2