Superannuation experts are calling on the Federal Government to reveal how much tax concessions on superannuation will cost over the next decade

From July next year, superannuation earnings of more than $100,000 will be taxed at 15 per cent instead of being tax free.

The changes will affect about 16,000 of the country's highest earners next financial year.

Richard Denniss, the executive director of The Australia Institute think-tank, says super tax concessions will cost the budget $32 billion this year.

Dr Denniss says last week's changes have done nothing to relieve pressure on the system.

"By 2015, Treasury estimates that [the $32 billion] will rise to $45 billion per year," he said.

"[That] $15 billion a year increase in the cost of tax concessions is enough to fund the Gonski [education reforms] and NDIS [National Disability Insurance Scheme] reforms instantly."

But Financial Services Council chief John Brogden says constant changes to the system act to discourage people to save for their retirement.

"There have been 11 changes to taxes, concessions and government contributions to superannuation since 2008, and with MySuper and SuperStream - the government reforms underway at the moment - there have been thousands of additional changes to the system," he said.

Dr Denniss and Mr Brogden made the comments in a National Press Club debate today.