Both the AAUP and SUOAF contracts refer to tuition waiver (course privileges). I have copied them below. As for any tax implication, you will have to contact Payroll.
13.13 Course Privileges
Subject to the approval of the receiving university, a permanent, full-time or emeritus member, with at least one (1) semester of service, spouse and children under the age of twenty-five (25) may take courses without tuition or State University fee at any university within Connecticut State University on a space available basis, provided, however that participation in said courses shall not interfere with the member’s employment obligations. This benefit shall also be available to the above mentioned spouse and dependents surviving a deceased member (death having occurred on or after August 24, 1990, during the member’s active service) who had accumulated ten (10) years of service in the University. Individuals taking courses on this basis may be admitted to a course in which space is not available, at the discretion of the instructor. Admission to a course shall not be counted toward overload credit as described in Article 10.3 of this Agreement. Cost of this provision shall be absorbed.
A part-time member who has been employed for eighteen (18) or more load credits in the University, or spouse or children under the age of twenty five (25) may take courses at any university in the system on a space available basis, provided however that participation in said course shall not interfere with the member’s employment obligations. For each load credit for which the member is compensated, one (1) credit hour’s extension tuition shall be waived or the full-time tuition and State University fee shall be reduced by one twelfth (1/12). The total benefit shall not exceed the member’s current equivalent workload credit and shall only be used during the semester of employment or the semester immediately following. Individuals taking courses on this basis may be admitted to a course in which space is not available at the discretion of the instructor. Admission to a course shall not be counted toward overload credit as described in Article 10.3 of this Agreement
22.2 Course Privileges
22.2.1 Subject to the approval of the receiving Connecticut State University, administrative faculty members shall be allowed to register for courses on a space available basis provided that such coursework does not interfere with the member's employment obligations. The tuition, University General Fee and State University Fee for courses undertaken shall be waived for all members of the bargaining unit.
The parties agree to participate in continuing efforts to access courses and programs offered by other Connecticut institutions of higher education on a tuition–free basis.