By adopting the stochastic frontier model, this study follows Anandarajan, Hasan, and Lozano-Vivas (2005) and examines the effi ciency frontier of the Loan Loss Provision (LLP) model in the Taiwanese banking industry during the period 1997 -2004. The determinants of the ineffi ciency LLP are also analyzed. The main results are as follows. (i) The overall effi ciency LLP index was 0.3282, indicating 67.18 per cent ineffi ciency of LLP decision making, similar to one major fi nding of the study by Anandarajan et al (2005), which suggests that ineffi ciency does exist for the LLP decision making. (ii) The LLP estimator is signifi cantly and positively correlated with default loan loss. (iii) Large fi rms are generally subject to an especially close scrutiny by fi nancial analysts and are thus highly motivated to maintain their credibility. In addition, they are more fi nancially transparent relative to small fi rms and are more effi cient in LLP decision making. (iv) Banks with higher non-interest expenses are inclined to manage LLP ineffi ciently.