The objective of this research is to understand the influence of black money on SMEs, to outline solutions to prevent and combat these illegal practices contributing to the strengthening of business responsibility and ethics. The methodology used is qualitative, based on the hypothetical deductive method applied in the field: the capital of the state of Puebla. The object of study is the influence of black money on SMEs. We consider black money to be money obtained illegally (drug trafficking, floor collection, clandestine marketing of fuels or any illicit activity) that comes from a legitimate source with the aim of “laundering” it, that is, disguising large amounts of cash as legal, which allows criminals to maintain control over their profits. The main finding is: 81% of SME owners are prone to use black money for the operation of their business.