UK Government aims to spend 3% of GDP on defense by 2030, Chancellor says, but not everyone's convinced

The Government has set two defense-spending milestones. It aims to spend 3% of the UK's economic output on defense by 2030. It also remains committed to NATO's target of spending 3.5% of GDP on defense by 2035. These targets matter because they would increase the resources available for equipment, training, operations and other defense needs.

Chancellor John Healey said the Government would explain how it will meet the 3.5% commitment at next year's spending review. He also set a target date for reaching 3% in 2030. Defense spending is expected to reach 2.7% of the economy by 2027, after funding is added to the Defense Investment Plan.

The Government says it will pursue the targets in a fiscally sustainable way. That could mean reducing or reprioritizing other public spending, while also using innovative financing with private-sector partners and international allies. Critics called the announcement a plan to have a plan.

Spending 3% of GDP means allocating defense a sum equal to three parts of every 100 parts of the UK's annual economic output. GDP, or gross domestic product, measures the value of goods and services produced in an economy. The commitment therefore rises or falls with the country's economic size rather than being a fixed cash amount.

For example, if GDP were £2 trillion, 3% would equal £60 billion. If the economy grew, the cash amount needed to maintain 3% would generally grow too. If GDP shrank, the same percentage would represent less money. The article estimates that reaching the target will require an extra £17.3 billion in 2029-30.

Using GDP also gives NATO members a common yardstick. It helps show defense effort relative to national resources. However, the percentage alone does not reveal exactly how effectively money is spent, or how much funding goes to equipment, personnel, training or operations.

Reaching 3% of GDP on defense is expected to require £17.3 billion more in 2029-30. This is an estimate from the Office for Budget Responsibility. It shows that the target is not only a percentage promise; it also represents a major future call on the public finances.

The exact cash requirement can change because the target is linked to GDP. A stronger economy would make 3% a larger cash sum. A weaker economy would make it smaller, although the Government would still need to meet the percentage if the commitment remained unchanged. The article gives the £17.3 billion figure specifically for 2029-30.

The Government has not yet published the full route to this target. John Healey said details would be set out at next year's spending review. He also said the effort must be fiscally sustainable, suggesting that spending reductions elsewhere and innovative financing could help cover the additional defense cost.

When defense receives more money from a limited budget, other government priorities may receive less. This could mean cuts, delayed projects or tighter budgets for departments outside defense. The article does not identify specific frontline services that would lose funding, so the precise effects remain undecided.

One mechanism is already visible in the Defense Investment Plan. Departments will be asked to reduce their capital budgets by 1% between 2027-28 and 2029-30. The Government expects this to raise about £3 billion for defense. Capital budgets usually fund long-term projects and investments, so reprioritizing them can change when public projects happen.

Healey also said the Government would examine public spending while using innovative financing with private-sector partners and international allies. The wider 3% target is estimated to require £17.3 billion extra in 2029-30. This creates continued pressure to balance defense commitments against other services and fiscal limits.

The Defense Investment Plan had a £4.7 billion funding gap. The Government has promised to cover it fully. This gap existed because the plan promised £15 billion of extra funding for defense but had committed only £10.3 billion, leaving the Chancellor to find the balance.

The main mechanism is a 1% reduction in departments' capital budgets from 2027-28 to 2029-30. The Government expects those reductions to provide about £3 billion. Capital budgets fund investment and long-term projects, so this is a reprioritization of planned government investment rather than a new tax announced in the article.

The remaining £1.7 billion will come from an unallocated contingency in the Treasury's capital reserve. Together, these sources fill the £4.7 billion hole. The extra funding means defense spending will rise to 2.7% of the economy by 2027, while the larger 3% target remains a later commitment.

The UK Government is dealing with two linked commitments. It aims to reach 3% of GDP on defense by 2030, while promising NATO that defense spending will reach 3.5% of GDP by 2035. The first target is therefore an earlier milestone, and the second is the later, higher level.

This staging gives the Government a timetable for increasing spending rather than requiring the full 3.5% immediately. Healey said the spending review next year would set out how the UK will meet the 3.5% commitment and confirm the target date for 3% in 2030. Defense spending is due to reach 2.7% of the economy by 2027.

The article links both targets to fiscal sustainability. Reaching them may require reprioritizing public spending and using innovative financing. NATO Secretary General Mark Rutte welcomed the announcement, while Conservative leader Kemi Badenoch criticized it as a plan to have a plan.

Governments receive money through taxes and other income, then decide how to allocate it among defense, health, education, infrastructure and other priorities. They can also borrow, but borrowing adds to future debt costs and is limited by fiscal rules, market confidence and the Government's affordability assessment. Spending priorities therefore compete when resources are constrained.

The article gives a concrete example. To fund the Defense Investment Plan shortfall, departments will reduce capital budgets by 1% between 2027-28 and 2029-30. That is expected to raise £3 billion. The Treasury will provide another £1.7 billion from an unallocated capital reserve, filling the £4.7 billion gap.

The larger 3% target is estimated to need £17.3 billion extra in 2029-30. Healey said the Government would look hard at public spending and use innovative financing. This means future decisions could involve reprioritization, new financing or borrowing, although the article does not announce specific service cuts or tax rises.