Barely four months before Britain is due to leave the European Union, May has failed to get much of her own Conservative Party behind the agreement sealed with EU leaders on Sunday, leaving open the possibility of a no-deal Brexit.
BoE Governor Mark Carney and finance minister Philip Hammond have both previously stressed the importance of a transition period, as included in May’s plan, to ease Britain out of its four-decade membership of the EU.
Carney said last week that the impact of leaving the bloc without a transition could be akin to the 1970s oil crisis for the world’s fifth-biggest economy.
But the prospect remains of a disruptive Brexit, given the scale of opposition to May’s plan in parliament where it faces a vote on Dec. 11.
The Daily Telegraph said Wednesday’s report from the government would show that in a scenario resembling May’s plan, Britain’s economy would be 1-2 percent smaller in 15 years’ time than if the country remained in the EU. But it would be 7.6 percent smaller if there is no deal.
The forecasts are likely to revive the protests from supporters of a more definitive break from the EU who accused the government of trying to scare voters into remaining in the EU ahead of the 2016 Brexit referendum.
“Politically, it looks like a rehash of Project Fear,” Dominic Raab, who resigned as May’s Brexit minister earlier this month, told the Telegraph. “People expect to be inspired, not scared witless into deferring to the government.”
Brexit supporters say May’s deal will hurt Britain’s economy by making it harder to strike trade deals with faster-growing countries and regions beyond Europe.
Many voters ignored government warnings of a dire outcome for the economy when they decided to leave the EU in the 2016 referendum and it is not clear that lawmakers will be swayed by forecasts about the effects of a no-deal Brexit.
The government is expected to publish on Wednesday morning its assessment of the impact of different Brexit outcomes including a comparison with remaining in the EU.
Then, at 1630 GMT, the BoE will publish its assessment of the implications for interest rates and its oversight of the banking sector arising from different Brexit scenarios.
Carney and other senior officials at the central bank have warned investors not to count on cuts to borrowing costs in the event of a no-deal shock to the economy, saying it could push up inflation sharply as well as damage growth.