The existing methods widely used for the design of Mechanically Stabilized Earth walls (MSE) do not consider the effects of reinforcement stiffness andwall-soil interface friction angle on the mobilized lateral earth pressures. For example, FHWA code provides the variation of the coefficient of lateral earth pressure, K, based on the type of reinforcement (extensible or inextensible reinforcement). The code recommends higher K values for MSE wall with inextensible reinforcement than that with extensible reinforcement. However, the reinforcement stiffness values corresponding to inextensible or extensible reinforcements are not defined in the code. In addition, the variation of K with depth is not available for intermediate values of reinforcement stiffness. Wall-soil interface friction angle is another important parameter that affects the mobilized lateral earth pressures. In the present study, Finite Difference Program (Fast Lagrangian Analysis of Continua FLAC) is used to study the effects of reinforcement stiffness and wall-soil interface friction angle on the lateral earth pressures for an active condition. © 2015 Taylor & Francis Group, London.