The reps said they would consider "mobilisation initiatives" if the government did not respond to their demands.
"We need to accelerate discussions on social security, pensions, health and safety, non-self-sufficiency, revival of investments, and quality and stability of employment," Luigi Sbarra, leader of Italy's second-largest union federation Cisl, said.
"If the government responds to our claims and priorities, fine.
Otherwise, together with CGIL and UIL, we are prepared to consider mobilisation initiatives in support of our demands."
Leading trade union federation Cgil deputy general secretary Gianna Fracassi said the meeting "did not go well, either on merit or method", adding that the union did not agree on the plans to reduce the number of income-tax bands applied to people employed by private-sector firms and the State from four to three in preparation for introduction of a flat tax, another measure contained in the proposed reform.
The reduction, she said, would "favour high and very high incomes", while the flat tax "is outside the dimension of progressivity provided for by the Constitution".
Prime Ministerr Giorgia Meloni's government is aiming to bring in a flat tax for all workers in Italy by the end of the current parliamentary term, in less than five years' time, according to its tax-reform bill.
At the moment, Italy has a 15 per cent flat tax, but it currently only applies to self-employed people earning up to 85,000 euros a year.
The reform also seeks to significantly cut down the number of taxes in force in Italy.
ANSA
