New research shows Brexit has cost UK up to £90bn per year in lost tax revenue, Lib Dems say – UK politics live | Politics

New research shows Brexit has cost UK up to £90bn per year in lost tax revenue, Lib Dems say

New research suggests Brexit has cost the government up to £90bn a year in lost tax revenue, the Liberal Democrats have claimed.

They have released the figures based on a new study by the National Bureau of Economic Research in the US that suggests the impact of Brexit on the UK economy has been worse than critics feared at the time.

The report has been written by five economists, including one from the Bank of England. They considered almost a decade’s worth of data and in their summary they say:

These estimates suggest that by 2025, Brexit had reduced UK GDP by 6% to 8%, with the impact accumulating gradually over time.

We estimate that investment was reduced by between 12% and 18%, employment by 3% to 4% and productivity by 3% to 4%.

These large negative impacts reflect a combination of elevated uncertainty, reduced demand, diverted management time, and increased misallocation of resources from a protracted Brexit process.

Comparing these with contemporary forecasts – providing a rare macro example to complement the burgeoning microliterature of social science predictions – shows that these forecasts were accurate over a 5-year horizon, but they underestimated the impact over a decade.

The Liberal Democrats asked the House of Commons library, which conducts authoritative research on behalf of MPs, to quantify what a reduction in GDP by 6% or 8% would mean for tax revenues.

The library said that if GDP were 6.4% higher in 2024/25 (the increase that would be need to compensate for the economy being 6% smaller than it otherwise would have been), tax revenues would have been £65bn higher.

And if GDP were 8.7% higher (the increase needed to compensate for the economy being 8% smaller), tax revenues would have been £90bn higher.

The library assumed the tax-to-GDP ratio remained at 34.7%.

Commenting on these figures, Ed Davey, the Lib Dem leader, said:

The most dishonest campaign in our history said it would save us £350m a week, but Brexit actually cost us £250m 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 Lib Dems want the UK to form a customs union with the EU. Next month they want to trigger a vote on this in the Commons.

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Key events

Heidi Alexander chooses larger of two options for Heathrow 3rd runway, requiring part of M25 to be moved

Ministers have backed plans from Heathrow Airport’s owners that would see the M25 moved to make way for a third runway, PA Media reports. PA says:

Transport secretary Heidi Alexander rejected a rival proposal from Arora Group, saying Heathrow’s own plans were “the most credible and deliverable option”.

The Heathrow proposals involve building a 3,500-metre runway and require a new M25 tunnel and bridges to be built 130 metres west of the existing motorway.

The Arora plan, put forward by a group led by hotel tycoon Surinder Arora, was for a shorter, 2,800-metre runway that would not require diverting the M25.

In a written ministerial statement, Alexander said the proposal would still have “a considerable impact” on the motorway, and require the compulsory purchase of more homes around the airport.

A Heathrow spokesperson welcomed the decision, saying expanding the airport “will mean more connectivity, increased trade, improved passenger experience and a huge economic boost for the British businesses that will help design and build it”.

But the spokesperson added that “further clarity” was needed on how the next phase of the project would be regulated, calling for “definitive decisions” from government and the Civil Aviation Authority by mid-December.

The planned third runway is estimated to cost £33bn, including £1.5bn on moving the M25, and is expected to be fully privately financed.

It will see Heathrow’s capacity increase to 756,000 flights and 150 million passengers per year.

The government aims to make a decision on a planning application for Heathrow’s expansion by the next election, with the third runway becoming operational by 2035.

In her statement explaining why she has chosen the Heathrow Airport Limited (HAL) scheme, not the Arora Group/Heathrow West Limited (HWL) one, Alexander says:

Following a comparative assessment of the remaining proposals for Heathrow expansion, the government’s view is that the Northwest runway scheme brought forward by Heathrow Airport Limited offers the most credible and deliverable option, principally due to the relative maturity of its proposal, the comparative level of confidence in the feasibility and resilience of its surface access plans, and the stronger comfort it provides in relation to the efficient, resilient and sustainable operations of the airport over the long-term.

The HAL scheme is considered comparatively more mature in its approach to road infrastructure. While the HAL scheme requires major works to the M25, assessment indicates that the HWL scheme would also have a considerable impact on the M25.

We know we must provide as much clarity and certainty for communities affected by expansion at Heathrow, as soon as possible. While HAL’s scheme requires more land, it would require the acquisition of fewer residential properties around the airport than HWL’s scheme.

The runway length proposed by HAL – up to 3.5km – is considered to be advantageous in terms of providing greater resilience and potential futureproofing for next-generation aircraft when compared with the 2.8km runway proposed by HWL.

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