Labor's education spokeswoman Carmel Tebbutt confirmed the party had decided against a conscience vote and would support the bill outright when it comes up for a vote later this year.

"The vast majority of non-government schools do the right thing and do not discriminate against students. However, consultation undertaken by Alex Greenwich MP has highlighted some examples of students who have had poor experiences or been subject to bullying at school," she said.

"Labor believes it is important to support this bill to demonstrate our support for tolerance and diversity and to send a clear message that discrimination against any student is unacceptable.”

But the bill's future remains uncertain with the Liberals yet to determine a position.

A spokeswoman for Attorney-General Greg Smith confirmed Liberal MPs would not be given a conscience vote, but said the party's position on the bill had not yet been determined.