"We are set to finally approve the Single Supervisory Mechanism today," Lithuanian Finance Minister Rimantas Sadzius said.
Once approved, the SSM will formally "enter into force in November next year," Sadzius said, as he arrived to chair a meeting of the 28 European Union finance ministers.
The SSM was originally supposed to start early next year but the timetable slipped amid sharp differences over its precise role and especially over how it would relate to non-euro countries.
To ensure that the 17 eurozone members did not out-vote the 11 non-euro members also grouped in the EBA, London got agreement in December that there would have to be a 'double majority' in both camps for any action.
London has won fresh assurances this would be the case, so clearing the way for the SSM and ultimately the Banking Union structure.
"This represents a decisive step towards the Banking Union," a draft of the closing statement said.
ECB executive board member Joerg Asmussen said SSM approval means "we can now start the real work -- hire people, rent a building ... All the practical things to be ready to start working in one year."
The SSM is to be complemented by a Single Resolution Mechanism to close failing banks and a Deposit Guarantee regime to protect savers.
Combined, this will provide the comprehensive, single regulatory framework intended to avoid any need for taxpayers to have to fund the disastrously expensive bank bailouts which led to years of austerity and recession in the eurozone.
German Finance Minister Wolfgang Schaeuble was notably restrained.
