UCCSD(T) and IC-MRCI methods have been employed in conjunction with large contracted basis sets for He [5s, 4p, 3d, 2f] and Be [9s, 8p, 6d, 4f, 2g] to characterize the ground electronic state of BeHe2+. For both UCCSD(T) and IC-MRCI wave functions, basis set superposition errors were included, with size-extensivity corrections included for IC-MRCI calculations. UCCSD(T) and IC-MRCI results are in agreement with predicted trends in geometry, vibration frequencies and potential well-depths. A 45-point potential energy surface was calculated using IC-MRCI from which a (4,4) Pade analytical function was constructed yielding an absolute error to the fit of the surface (chi(2))(1/2) of 3.88 cm(-1). (c) 2006 Elsevier B.V. All rights reserved.