This paper analyzes the effect of private supplementary pensions (and the tax reliefs that aim to stimulate such plans) on national saving in Spain. It tries to test the alleged positive effects of private pension plans on savings. Using a longitudinal dataset and fixed-effects methods, we find that tax-favored contributions to a pension fund are not associated with a lower consumption level, which implies that this policy does not increase national saving. The empirical results on the impact of contributions on private household wealth are less clear.