But the heads of state and government of the EU member states, in their first physical meeting since the outbreak of COVID-19 in Europe, seemed resolved to reach a deal as meetings in small groups continued during a prolonged midnight plenary break.
The summit, which kicked off on July 17, had been scheduled to end on July 18.
Officials said the discussion was in the right direction as the leaders were seeking consensus on the proposals to authorize the European Commission to borrow EUR750 billion (US$857 billion) and give as grants and loans to the pandemic-hit member states.
The long list of disagreements has been reduced to only four points thanks to the brokering efforts made by European Council President Charles Michel, according to Hungarian Prime Minister Viktor Orban.
The most difficult issue was rebates, a term referring to the compensation offered to some wealthy countries, including the Netherlands, Sweden, Denmark and Austria, which claim to have made excessive contributions to the EU budget even if based on objective economic criteria.
European Parliament Speaker David Sassoli has said the time has come to eliminate the rebates, which are "unfair and difficult to justify."
Michel has made a middle-ground proposal allowing countries with long-held rebates on their European contributions to continue to get them.
The Netherlands and Austria were said to be tough on the rebate issue during Sunday's negotiation, and called for setting up a new mechanism to supervise the beneficiaries' commitment to the rule of law.
Earlier in the day, Austrian Chancellor Sebastian Kurz said despite some progress, there was still "a long way to go" to reach an agreement.
During dinner time, Slovenian Prime Minister Janez Jansa tweeted a chart from the European Commission, showing the great benefits achieved by EU member states thanks to the single market against their contributions to the bloc's long-term budget, formally known as the Multiannual Financial Framework (MFF).
"EU was built on the assumption that you can trust each other to cooperate in good faith. This kind of trust is why countries have opened their borders and their markets and created a single market. Its benefits largely outweigh the cost of contributing to the MFF," said Jansa, referring to the intention of wealthy EU countries to ask for more rebates, an assertion largely rejected by the rest.
Besides, the overall size of the fund and the ratio of grants versus loans were also points of contention.
The frugal countries asked to lower the total to EUR700 billion (US$798 billion) with the non-payable grants not exceeding EUR350 billion (US$399 billion), while the rest of the bloc members preferred the original package of EUR750 billion (US$857 billion) with two thirds in grants and one third in loans.