Note the use of a qualified majority to ratify a deal, but unanimity to extend the deadline. If negotiations get bogged down but don’t break down, any state could veto a proposal to keep the talks going. Suppose that proposal came before the European Council. To take just one example of what might happen, Spain could threaten to veto further talks unless the UK offered concessions in relation to its overseas territory of Gibraltar. Indeed, any of the other 27 member states could throw a wrench in the works.

By contrast, Spain on its own could not block a deal if EU and UK negotiators did reach one. But neither could the UK’s friends in the EU insist on a favorable deal without building the necessary majority in the Council of Ministers. An example might be Ireland seeking arrangements that would keep open its border with Northern Ireland. So the qualified-majority rule is of partial, but only partial, benefit to the UK.

At this stage, nobody can be sure whether the negotiations will succeed or fail. But here is one reason why they might be extremely tricky. It concerns money. Already, the promise of the pro-Brexit campaign before the June 2016 referendum—that the UK could save the £350 million ($436 million) a week it contributes to the EU and spend it instead on the National Health Service—has crumbled. That figure relates to Britain’s gross contribution to the EU. But around half of that money comes back to the UK anyway, so the net transfer is much less. Furthermore, British ministers have accepted that the UK may continue to contribute to European programs of which it approves, such as science and space exploration.

That is not all. In Brussels, the talk is of demanding from the UK a one-off payment of €40–60 billion ($43–65 billion) for leaving the bloc. A Financial Times report suggested that this could be the cost of future spending commitments that the UK has agreed to help finance but that will not fall until after Britain leaves. Some are medium-term budget commitments; others cover longer-term liabilities such as pensions and loan guarantees. Ivan Rogers, until recently the UK’s ambassador to the EU, has told a committee of parliamentarians in London that this is indeed the amount that the EU will demand.

There is no reference to such an exit fee in Article 50. However, there is a precedent. When the UK decided in 2013 to opt out of parts of the EU’s police and criminal justice legislation, it accepted a protocol containing these words: “The Council . . . may also adopt a decision determining that the United Kingdom shall bear the direct financial consequences, if any, necessarily and unavoidably incurred as a result of the cessation of its participation in those acts.” It is easy to see the EU applying “necessarily and unavoidably” to the costs that Brexit will impose on the remaining 27 member states.

If there is a Brexit deal, then the chances are that the EU will impose a much smaller penalty on the UK. Some of the costs might be subsumed within transitional arrangements, for example to gradually withdraw both Britain’s payments and its rights of access to the EU single market over a number of years. There is also the possibility of brute political force: if everything else is agreed on, there will be immense pressure to compromise on the size of the penalty.

However, nobody should rule out the dangers of deadlock. Even if the calculations being done in Brussels turn out to be ambitious—and nobody has yet made public a detailed breakdown of the sums—it is certain that after Brexit, the EU will have future funding commitments to spread across fewer countries. UK negotiators will be asking the other 27 states not only to give Brits the best deal but also to increase their own contributions to the EU so the UK can pay as little as possible for Brexit.

Suppose the true cost of Brexit to the rest of the EU is €30 billion ($32 billion), but the UK refuses to pay anything above €10 billion ($11 billion). That will leave a €20 billion ($21 billion) gap, to be filled by larger contributions from other member states, or by cuts in EU spending, or by a mixture of both. Agreement on that might be possible, but it will not be easy. Some EU members in Southern and Eastern Europe may well plead poverty, while the leaders of richer countries, such as Germany and Sweden, would risk a backlash from their voters if they agreed to pick up the tab.

Worse, if there is no deal, there will be nothing to stop the EU from taking the UK to court to demand payment in full. In that case, it won’t just be the issue of applying WTO tariffs to UK-EU trade that clouds the UK’s future; it will be the possibility of the UK being sued for billions of euros.

If that is where Britain ends up, May’s words “No deal is better than a bad deal” could come back to haunt her.

 

Peter Kellner is a journalist, political commentator, and former president of YouGov.