This paper shows that, contrary to their favourable effect in the EU non-FCC (Former Communist Countries), fiscal rules do not significantly affect fiscal performance in the group of EU FCC. This finding, which may echo differences between FCC and other EU inherited from the Cold War period, is robust when considering various estimation methods, dividing fiscal rules along various dimensions, and using several observed and computed measures of fiscal performance. However, when going beyond the simple presence of fiscal rules, we find that an improvement of the strength of fiscal rules significantly affects fiscal performance in EU FCC, with a magnitude higher than that in EU non-FCC. Our findings are particularly important from the perspective of the future Euro zone and European Union enlargements, which involve former communist countries, and go along with the adoption of various types of fiscal rules.