The structure of the paper is as follows. In the next section, we outline essential features of the EOM-CCSD method and the calculation of the state and transition properties within EOM-CC. We then describe spin-tensor formalism and apply it to derive the key equations for calculation of the SOC matrix elements via reduced density matrices and Wigner-Eckart's theorem. We also discuss the implementation of the algorithm within the EOM-CC suite of methods in the Q-Chem electronic structure package . We discuss additional aspects of the theory in the case of open-shell references. Section III presents illustrative calculations.