In order to fight money laundering, efficient international cooperation in criminal matters is necessary. As Switzerland is one of the world's leading financial centres, it is often approached by foreign states, in particular to obtain bank documents. Switzerland grants extensive judicial cooperation in money laundering matters, provided that foreign requests comply with the requirements of Swiss law on international mutual assistance in criminal matters. The purpose of this contribution is to discuss how the Swiss authorities respond to requests for mutual assistance in money laundering matters submitted by EU Member States. The article does not only give insights into the Swiss law but also into the practice to decide on MLA requests as defined by the Swiss federal courts.