UK Defence Spending: Will It Reach 3% of GDP by 2029? | UK Politics Explained (2026)

A bold move is on the horizon for the UK government, as they contemplate a significant increase in defense spending. This proposal, which aims to allocate 3% of the country's GDP to defense, has sparked both excitement and controversy.

The prime minister's aides are reportedly exploring ways to achieve this ambitious target by the end of the current parliament, potentially by 2029. However, no official decision has been made, and the Treasury remains cautious.

The idea was discussed at a critical meeting earlier this month, where the focus was on fulfilling existing defense commitments as part of the long-awaited "defense investment plan." Reports suggest that the Ministry of Defence (MOD) requires an additional £28 billion to cover existing costs over the next four years.

Sir Richard Knighton, the chief of the defense staff, highlighted the challenge, stating, "We cannot do everything we want to, as quickly as we want, within our current budget." This realization has driven the idea of accelerating spending plans.

Downing Street sources emphasize that the defense investment plan is still being finalized, and decisions are yet to be made. Reaching the 3% GDP target five years earlier than planned would be an expensive endeavor.

The Office for Budget Responsibility estimates that increasing defense spending to 3% of GDP by 2029-30 would cost an additional £17.3 billion per year. However, Bee Boileau, a research economist, suggests a slightly lower figure of around £13-14 billion, considering existing spending increases.

Last year, the UK spent approximately 2.3% of its GDP on defense, amounting to around £66 billion. The country, along with other NATO allies, has committed to spending 3.5% of its GDP on core defense by 2035.

Sir Keir, speaking in Munich, made a compelling case for increased defense spending to counter the threat posed by Russia. He emphasized the need to build hard power, stating, "We must spend more, deliver more, and coordinate more."

The prime minister argued that greater defense spending would reduce reliance on the United States and foster stronger cooperation with European allies to defend Ukraine.

"To address the wider threat, it's clear we must spend more, faster," Sir Keir said. "We've demonstrated our collective intent with the historic agreement to increase spending to 5% on security and defense. We're open to innovative solutions."

One defense source described the prime minister's speech as an argument for increased defense spending, with the announcement being the missing piece.

Whitehall sources revealed that Morgan McSweeney, Sir Keir's former chief of staff, had been a strong advocate for extra defense spending. However, since McSweeney's resignation, Treasury concerns have intensified.

Treasury sources deny specific resistance to a 3% plan, stating that joint conversations about future defense spending are ongoing and led by the prime minister.

Other Whitehall sources suggest that the Treasury could be tasked with finding the necessary funds, potentially by redirecting budgets from areas like Overseas Development Assistance, net-zero economy initiatives, or high-speed rail projects.

An alternative option is to borrow the money, but the Treasury is reluctant to breach its borrowing targets, fearing negative impacts on financial markets.

Meeting the 3% spending target in this parliament would be well-received by the United States, which has privately urged the UK to accelerate its defense spending.

A defense source commented, "Shifting the 3% target left is not surprising, given the government's commitment to reach 3.5% by 2035 alongside other NATO allies. The UK must demonstrate its path to achieving this goal."

Foreign Secretary Yvette Cooper acknowledged the need for further action, stating, "We must strengthen our defense and partnerships to be able to do so."

An MOD spokesperson emphasized, "We do not comment on speculation. The government is focused on delivering for defense. We are committed to the largest sustained increase in defense spending since the Cold War."

This proposal has sparked a lively debate, with some advocating for increased defense spending and others questioning the allocation of resources. What are your thoughts on this potential shift in defense spending? Do you think it's a necessary step, or are there other priorities that should take precedence? Feel free to share your opinions in the comments below!

UK Defence Spending: Will It Reach 3% of GDP by 2029? | UK Politics Explained (2026)

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