NBN Co chief executive Bill Morrow has admitted its recent price discounts have left it “unlikely” to hit its average revenue target for each home and business connected by 2021, though watered down expectations it could leave overall revenue falling short.

Average revenue per user has long been forecast to reach $52 by the end of the national broadband network rollout, if the NBN Co intends to deliver on its $5 billion revenue projections.

NBN Co chief executive Bill Morrow said there would be a delay in reaching its revenue target. Credit:Daniel Munoz

The results for the six months to December 2017 found the average revenue had increased to $44, up 2 per cent from $43 in December 2016.

Despite this, Mr Morrow said at the company's half-year announcement on Monday that it was “probably unlikely” to reach its $52 target due to price promotions and discounts announced in December.