The budget's "positive" measures are largely neutralised by the recently announced "exorbitant" water and electricity rates, according to Alternattiva Demokratika.
Referring to last Monday's budget speech as the "second part of the budget", AD chairman Arnold Cassola called for a scientific and economic impact assessment to determine the effects on society.
Meanwhile, AD sustainable development spokesman Carmel Cacopardo said the new car registration tax system was "badly designed" since it was based on the age of the car while not taking account of the vehicle's actual emissions.
Mr Cacopardo also criticised the subsidy scheme launched by the government on photovoltaic panels, saying that only around 200 families would be eligible.