David Cameron will press for a minimum real-terms freeze in the EU's budget as leaders gather for a crunch summit on 2014 to 2020 spending today.
But aside from the politics, what do UK businesses make of the increasingly fractious relationship with Brussels?
What do they get out of the EU, and what damage does membership do to some UK firms?
Stephen Radley, chief economist at the manufacturers' organisation the EEF, explained to Today business presenter Simon Jack: "Business doesn't like uncertainty
they want Europe to be more dynamic but they don't want unnecessary disruptive change."
Phillip Souta, director at pro-Europe coalition Business for New Europe, said that the idea that we would see "radically or drastically less regulation" if the UK were outside the EU is "an over simplification".
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