NSW public service wage increases could outstrip a $3.6 billion fund the Minns government created as a buffer to support higher claims, according to a treasury analysis of the state budget, as a slew of unions prepare for fresh negotiations and rule out multi-year deals.

Emboldened by big wage deal wins in the education, health and community services unions, NSW paramedics will push for one-year pay rises of as much as 30 per cent in their first round of negotiations following the government’s removal of a 2.5 per cent wage cap.