TCC: Transmitter Control Code. This is the 5-character code that was assigned to the transmitter by the IRS in order to file electronically. TCC is like your unique ID that you need to have to e-file 1099s with the IRS. If you do not have a TCC, please see "How do I obtain a TCC code?" question.
Real Business Solutions Support Team, Makers of W2 Mate and Payroll Mate