The EU hasn’t officially asked for any particular sum of money, but does say that “the United Kingdom must honour its share of the financing of all the obligations undertaken while it was a member”.
The UK government accepts that there might be a payment involved. But not the scale of it.
In late November, the Telegraph reported that the final payment figure will be “between €45bn and €55bn, depending on how each side calculates the output from an agreed methodology”. That’s between around £40bn and £49bn.
They say these terms were agreed at a meeting between both sides in Brussels, although it is not yet an official agreement.
Alex Barker and George Parker of the Financial Times says of the same negotiations that the UK will assume liabilities “worth up to €100bn” (£88bn). However, he says that the net figure (after deductions for payments made to the UK) could fall to less than half of that – “with the UK side pressing for an implied figure of €40-45bn” (£35-£40bn).
These reports have been neither confirmed nor denied by the UK and EU sides.
The Prime Minister said in a major speech in Florence in September that: “I do not want our partners to fear that they will need to pay more or receive less over the remainder of the current budget plan as a result of our decision to leave. The UK will honour commitments we have made during the period of our membership.”
There have been no official figures from either the UK or EU so far.
A Sunday Times report in September suggested the Prime Minister could approve a bill worth up to £50 billion (€54bn), while in August the Sunday Telegraph suggested £36 billion (€40bn) was considered by the UK as the sum likely to be reached through negotiations with the EU.
Researchers have speculated previously what the size of the demand might be, and €60 billion is within the range of several of the estimates so far.
The same figure had been circulating in Brussels since last year. More recent reports that the EU view of what to ask the UK to pay for was hardening led Alex Barker of the Financial Times to calculate an upfront demand of between €91-113 billion.
There’s no definitive figure for how much the EU will ask for. Professor Iain Begg, an EU budget expert, has said that calculations can only be “on the back of an envelope”.
These calculations are complicated: there are various liabilities apart from just the core EU budget; the UK’s share of these isn’t settled; and there’s the question of whether the UK is entitled to a portion of EU assets. So there are different figures for different assumptions and scenarios. Lower estimates assume “minimal obligations to the EU and maximum UK receipts”, whereas higher ones “maximis[e] the UK’s obligations and minimis[e] its receipts, as the Institute for Government puts it.
Nor do we know how much the UK government will actually agree to.
A House of Lords report has argued that legally the UK isn’t required to pay a penny. This has been disputed by some legal experts, and the report itself acknowledges that there are “competing interpretations”.
Correction 9 August 2017
We've removed the currency reference from the claim, which wasn't actually specified on the programme.
This factcheck is part of a roundup of BBC Question Time. Read the roundup.
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