Im et al. (Unpublished working paper, 2008) develop cointegration tests using stationary instrumental variables. Their tests avoid the need to simulate critical values for the cointegration estimations, especially problematic in the presence of a nuisance parameter. Likewise, bootstrapping errors is unnecessary. Using an updated version of the Taylor (Rev Econ Stat 84(1):139-150, 2002) data set, the Im et al. (Unpublished working paper, 2008) approach is applied to two well-known, single equation cointegration methods to test for purchasing power parity. The estimations with instruments provide evidence of purchasing power parity (PPP) for more than half of the countries studied; but the empirical results, hence conclusions regarding PPP sometimes differ with the choice of instrument. © 2013 Kiel Institute.