NSW voters head to polls in tightly contested election

NSW voters have until 6pm to cast their ballots as the state goes to the polls. (Dean Lewins/AAP PHOTOS) (AAP)

Voting is under way in NSW, with more than four million people across the state set to decide who will form government for the next four years.

By Friday close to a quarter of the state's 5.5 million voters had cast their ballots, with nearly 1.2 million people pre-polling and 92,000 lodging postal votes.