TPG will save about $10 million over five years in NBN levies after the federal government introduced an exemption in the Regional Broadband Scheme, which helps subsidise NBN Co's cost of supplying satellite and fixed wireless to regional areas.

In legislation introduced on Thursday, the government revealed the first 25,000 premises serviced by a super-fast broadband network owner will be exempt from the $7.10 per month levy, which starts in July 2018.

NBN Co's chief executive Bill Morrow. Credit:Daniel Munoz

The levy only applies to fixed lines, not mobile broadband or fixed wireless broadband.

The exemption means the smallest players may not have to pay the RBS levy at all until mid-2023, and companies with more than 25,000 will save about $2.13 million annually for five years.