Tonight's debate is taking place in western Sydney.
Many experts believe the election can be won or lost in NSW.
This is partially due to the high number of marginal seats, a total of 15 across the state, held by a margin of 6 per cent or less.
Labor currently holds 26 of 46 NSW seats, however, nine of these are marginal.
Seats to watch include Bradfield, Bennelong, Calare, Reid, Parramatta, Werriwa, Gilmore, Fowler and Paterson.
Cost-of-living will be front of mind for many of tonight's 100 undecided voters, with Sydney residents paying some of the highest rents and mortgages in the country.
— Ewa Staszewska