Brexit is costing the UK up to £90 billion a year in lost tax revenue, new analysis has revealed.
The Treasury missed out on £250 million a day in 2025, according to research published by the House of Commons library.
A recent study by US think-tank the National Bureau of Economic Research found that the British economy is between 6% and 8% smaller than it would have been had Brexit not happened.
According to the House of Commons library, that resulted in between £65bn and £90bn less tax being paid to the government in 2024/25.
It also found that the average Brit is between £2,700 and £3,700 worse off as a result of the UK’s decision to leave the EU.
The research was carried out on behalf of the Lib Dems, whose leader Ed Davey said: “The most dishonest campaign in our history said it would save us £350 million a week, but Brexit actually cost us £250 million a day in 2025.
“That is why we have the highest taxes ever, that is why we have sky-high bills, that is why we have a cost of living crisis.
“Worst of all, Labour know the cost of Brexit but refuse to do anything about it. My message ahead of the Budget is clear: fix our broken relationship with Europe to end the cost of living crisis.”
The findings come just days after former Tory prime minister John Major branded Brexit “an act of collective folly”.
He said: “It left our country poorer, weaker and divorced from the richest free trade market that history has ever seen.
“National interest was brushed aside by false hopes and promises. False hopes and promises that even a cabinet dominated by frontline Brexit enthusiasts was unable to deliver.”
Tom Brufatto, director of policy and research at Best for Britain, told HuffPost UK: “Brexit will continue to cripple our economy and our public finances until meaningful action is taken to remove the artificial barriers to trade it created.
“That starts with both the EU and UK progressing the areas of mutually beneficial cooperation outlined in May, on defence, on youth mobility and most crucially on greater regulatory alignment, starting with food and drink.”