School principals say Novopay is still struggling to pay teachers properly, with an average of almost six teachers at every school affected by incorrect payments.
A survey this week of 714 principals, conducted by the Principals' Federation, found 72.7 per cent of principals had no confidence the system was on track to becoming an effective payroll tool.
It also found an average of 5.89 staff per school were paid incorrectly in the latest pay round, while two thirds of schools still had unresolved problems from last year.
Principals' Federation president Philip Harding said he expected the first pay round of the year to be challenging, but the error rate was "way beyond anything we imagined".
He was also disappointed by the number of problems that remained unresolved from last year.