The leader of Unidas Podemos, Pablo Iglesias, also a deputy prime minister, said on Thursday that the government was putting the finishing touches to rolling out a permanent minimum living wage from May.
The policy has long been held by the anticapitalist party despite the reticence of their majority coalition partners, the Socialist PSOE.
Iglesias explained in a message on social media that the minimum income for everyone will become "a new core social right", and that "it fills the fridge for a great many compatriots and many people can maintain a minimum level of consumption".
However Social Security minister, José Luis Escrivá, of the PSOE party, appeared to contradict Iglesias later: "We need weeks not to announce it but to get it onto the statute books," he explained. He added that the government had to carefully check tax data to make sure people genuinely in need would benefit and also work out how much it would cost to implement.