PARIS — The outlook for the eurozone remained unsettled Thursday, as data showed that confidence among European businesses and consumers continued to fall in September and the Spanish government prepared to unveil a plan to restore its finances next year.

The European Commission reported from Brussels that its economic sentiment indicator for the 17-nation eurozone fell by 1.1 points, to 85.0, a seventh month of decline.

The commission attributed the weakening to slipping confidence among services, retail and industrial businesses, as well as among consumers. For the broader, 27-member European Union, confidence fell by 0.9 points in September, to 86.1. The commission pointed to more optimism among construction managers in both areas as a sign for hope.

The data ‘‘serve as another warning that the eurozone economy is sinking further into recession,’’ Jonathan Loynes, chief European economist at Capital Economics, wrote in a note, adding that it dashed hopes that the European Central Bank’s Sept. 6 pledge ‘‘to take more decisive policy action might have improved sentiment towards the broader economy.’’

Loynes said the confidence data were consistent with an annual contraction in eurozone economy of about 2.5 percent.

In Madrid on Thursday, Prime Minister Mariano Rajoy was preparing to roll out tough measures to bring the 2013 budget in line with its target — 4.5 percent of gross domestic product, from the 6.3 percent targeted for this year.

Spain, which had already received a promise of up to $129 billion, to restructure its shaky financial sector, is hoping to avoid the type of full bailout that Ireland, Portugal, and Greece have already received, and more importantly, the constraints on government action such bailouts have entailed.

In Athens, Prime Minister Antonis Samaras and his coalition partners reached agreement on the basic components of a new austerity package. Finance Minister Yannis Stournaras said the accord would form the foundation for dynamic negotiations with the troika on Monday. The head of the junior partner in the coalition, Fotis Kouvelis of Democratic Left, was more reserved, saying that he had reached a basic agreement with his coalition partners but stressing that ‘‘some outstanding issues remained.’’

The Socialist leader Evangelos Venizelos said the basic pact still needed to be finalized in detail and that ‘‘intensive political negotiations’’ would continue, an apparent reference to forthcoming talks with the three-party coalition.