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In this paper, we investigate the performance of different approximatevariants of the EOM-CCSD method for calculation of ionization potential, ascompared to EOM-CCSDT reference values. The errors in the various approximatevariants of the EOM-CCSD method are quite different for different kind ofionized states. None of the approximate variants including the originalEOM-CCSD method gives a uniform performance over outer valence, inner valence,and core ionization, favoring one or other, depending upon nature of theapproximation used.

Assessment of Low Scaling Approximations to EOM-CCSD Method for Ionization Potential