The purpose of our paper is to highlight the main negative economic implications of the existence of tax havens, namely the increase in harmful tax competition, the erosion of the tax base and implicitly the reduction of tax revenues; all these negatively affect the economic development of a country, negatively affecting direct investments, or effects on the structure of tax revenues. However, it should be mentioned that in addition to the negative ones, there are also positive effects/implications on the economy, respectively, they can contribute to the reduction of taxes in other jurisdictions, or even the economic development of tax havens. The methodology used is descriptive and empirical, by calling on various bibliographic sources, with a preponderance of foreign specialized literature, as well as a quantitative methodology, for the processing and analysis of data taken from international databases.