The topic of pay transparency has reached great importance in the fight against gender gap and gender discrimination. Some time ago, certain national legislations developed rules that imposed on companies a set of duties, more or less demanding, to report about the average remuneration of men and women and to adopt meaasures in the event of excessive differences. Based on this experience, the European Commission approved the Recommendation of March 7, 2014, which led to legal reforms in several Member States, although not in many of them, due to the non-binding nature of the EU legislation. In the case of the Kingsom of Spain, the incorporation of the guidelines of the Recommendation was delayed until 2019, ans then it was completed with the regulatory development of 2020. Currently, the Proposal for a Directive on pay transparency measures have raised a renewed discussion on the sufficiency, relevance and adequacy of the various measures adopted. This study develops an analysis from the perspective of domestic legislation and other comparative models, especially of EU member countries, and not few critical considerations on this subject are formulated.