Teachers have taken their fight for more school funding to federal parliament, but the education minister has accused them of scoring an own goal.
The Australian Education Union's "I give a Gonski" buses rolled into Canberra on Wednesday after three weeks on the road.
Labor leader Bill Shorten and his deputy Tanya Plibersek joined teachers and principals on the lawns of Parliament House to call for a big boost to funding in the May budget.
They heard from 24 principals around the country who said the money received since 2014 under the so-called Gonski funding has made a big difference to their students.
But Education Minister Simon Birmingham says some of the schools the union is profiling actually received less money in 2015 than 2013.
"How can policymakers and teachers trust the education union and Labor when they're peddling fraudulent documents like this?" he told AAP in a statement.
It was an "embarrassing own goal" for Mr Shorten, he said.
"This analysis proves what I've been saying all along - that while a strong level of funding matters, and we have record funding under the Turnbull government, what matters more is how funding is used."
Union president Correna Haythorpe rejected the minister's analysis, saying the figures were at least two years old and don't reflect what principals are saying.
"Instead of trying to discredit the very brave principals who are here sharing their stories, come down and meet them and see the evidence first hand," she told reporters.
The union also released its State of Schools 2017 survey to back its call for large funding increases from next year, which the Turnbull government has repeatedly ruled out.
The survey found that only one in five principals believed funding was enough to meet the needs of all their students, and nearly half said their school was under-resourced now.
The government is negotiating a new school funding deal with the states and territories, which leaders are expected to agree to at the next COAG meeting, likely to be in June.
