Comparison website WhistleOut conducted the analysis, comparing speeds and pricing of , Internode, Exetel and iPrimus NBN plans.

Based on the cost of copper phone line rental and ADSL usage from the four providers, WhistleOut director, Cameron Craig, said consumers can expect to save between 23 and 43 per cent on their internet plans once the NBN has finished being constructed.

"On the NBN's entry level speeds of 12Mpbs [megabits per second] and 25Mbps we found consumers will actually be paying less than today's ADSL 2+ and line rental plans for the equivalent usage," Craig said.

"[This equates to] savings of 23 per cent to 43 per cent on the entry-level speeds of 12Mbps."

Craig said the NBN will democratise internet access across Australia.