Macroprudential policies are being implemented around the globe. A key question is whether these policies prompt substitution toward the non-bank financial sector. This column presents compelling evidence of such ‘waterbed effects’ after macroprudential policy action. Substitution towards non-bank credit is stronger when policy measures applied to banks are binding and are implemented in countries with well-developed financial markets. While systemic risks may nonetheless decline, waterbed effects highlight the importance of developing macroprudential policies beyond banking.