The equilibrium structures and harmonic Vibrational frequencies for CHBr+, CBr+, and their neutrals have been determined using second-order Moller-Plesset perturbation theory, singles and doubles configuration interaction theory, and coupled-cluster theory in conjunction with the triple-zeta double-polarized and 6-311++G(3df, 3pd) basis sets. The coupled-cluster results are in good agreement, for the experimental geometries and harmonic frequencies, with available experimental data. The adiabatic ionization potentials are predicted to be 205.7 kcal mol(-1) for CHBr and 197.5 kcal mol(-1) for CBr.