The SIM card tax is actually under-ambitious for potential change to be maximised. Nevertheless, the tax initiates a step in the right direction. Firstly, it will ensure reductions are made in tax avoidance. Secondly, the model shows the potential role the private-sector can play in tax collection. Decentralisation, and shifting responsibility, to independent providers means valuable resources can be collected outside of the criticised TRA structure. For example, the Association of Tanzania Employers may be granted greater involvement in enhancing corporate tax collection. Estimations suggest corporate tax exemptions resulted in annual revenue losses of 4% between 2011-2012 (Gaddis, 2013).  The SIM card tax indicates domestic resources can be mobilised by engaging in public-private partnerships. For progressive tax systems, Tanzania needs to utilise private actors.