Britain is facing an extra £1.7 billion bill towards the EU budget.
The shock demand - which would add almost a fifth to the UK's annual contribution of £8.6 billion - is intended to reflect improvements to Britain's economy since the figures were last calculated.
Preliminary figures seen by the Financial Times suggest Britain is facing by far the biggest top-up.
By contrast, Germany receives a rebate of 779m euro, France 1bn and Poland 316m.
Today's trip to Berlin should be a moment to savour for the Chancellor, but it is the £1.7 billion EU bill that is on everyone's minds.
George Osborne has told ITV News it is "not acceptable" for the EU to spring a £1.7 billion bill on Britain without any warning.
Ukip leader Nigel Farage has told ITV's The Agenda Britain should tell the European Union to "get stuffed" over the £1.7 billion bill.