Among all the demands submitted to the British Government as part of the current review of gambling legislation, the one for a harm prevention levy is often presented as the most straight-forward. The idea of putting the current system of voluntary industry contributions on a statutory and prescriptive basis attracts support from campaigners, the industry regulator, and several of the larger licensees. There is some logic to this as the provision of treatment services for gambling disorder in Great Britain (and likely in most jurisdictions worldwide) needs to be put on a more substantial and sustainable footing. It is far from obvious however that a new tariff is the best means of achieving this.