"This contribution is of similar value to the retail sector or Australia's iron ore exports," the report said.
In terms of the outlook, the report said the direct contribution to the Australian economy over the next five years would increase by A$20 billion, or 7 per cent, to A$70 billion.
This growth was twice as fast as the rest of the economy, the report said.
The report found the internet yielded A$27 billion in productivity increases to business and government, which flowed through to lower prices and new products, and delivered benefits of about A$53 billion to households.
Were it not for the internet, Australia's poor level of productivity growth in recent times would have been even worse, said Deloitte Access Economics director Ric Simes.
Leeder said research had shown that for every job lost due to the internet, 2.6 new jobs were created.
"While overall it is good, a change like that does create friction," Leeder said.
- AAP