In the letter, the groups argued that criticism of the current systems and its often-claimed “unfairness” has been exaggerated by various media outlets.

The groups also argued that the superannuation system should be considered as part of the overall retirement savings and incomes system. This should include benefits such as the age pension and Commonwealth Seniors Health Care Card.

“Different parts of the retirement income system have different objectives. The age pension provides a safety net to reduce poverty. Compulsory superannuation savings prevent over-reliance on the age pension from people with private resources and address behavioural biases that lead people to under-save,” the letter stated. “Superannuation tax concessions prevent compulsory and voluntary long-term savings from being overtaxed.”

Further, the groups argued the caps on contributions should be retained as an “economically effective” way of limiting access to superannuation tax concessions, as opposed to taxing or limiting resultant earnings or balances.

“The contribution caps should be set at a level that allows Australians to save adequately in super. Consideration should also be given to having a rolling cap or lifetime cap rather than an annual cap so as to provide more flexibility and opportunity to save for those with broken work patterns,” the letter stated.