The Commission noted that the budget plan the government submitted by the mid-October deadline contained only measures that had been already adopted, with no new measures planned for 2019.
It also took note of the Slovenian government's commitment to update the plan as soon as the budget bills for 2019 are sent to the Slovenian parliament.
But is added that the current scenario projected higher expenditure growth than recommended, 3.9% compared to 3.1%, and that the structural effort was projected at a negative 0.7% of GDP, which runs contrary to the recommendation that Slovenia budget a structural improvement of 0.65% of GDP.
The letter - similar letters were also sent to Belgium, Spain, France and Portugal - comes after the government decided to eschew adopting a revised budget for 2019.
Instead, it submitted to Brussels documents adopted in late 2016 as part of two-year budgeting.
The government decided to delay revising the budget due to a series of outstanding issues, most notably public sector pay negotiations and the abolishment of austerity measures planned for next year, that are unlikely to be resolved soon.