We examine how international transfer affects welfare levels of a donor with a higher marginal propensity to save and a recipient with a lower marginal propensity to save, when both countries adopt a pay-as-you-go (PAYG) pension system using a one-sector overlapping generations model. A PAYG pension scheme is found to lead to impairment of the donor and of the recipient as a result of the transfer under the dynamic efficiency condition. This is because the transfer increases the divergence in the rate of return between PAYG and private savings.