UK Defence Spending in 2026: The NATO Target, Equipment Gaps, and £17 Billion Shortfall

NATO member states agreed in 2014 that each alliance member would commit to spending at least 2% of gross domestic product on defence by 2024. The UK has consistently met and slightly exceeded this target, reporting expenditure of approximately 2.3% of GDP in 2025/26 — a figure the government regularly cites as evidence of its commitment to collective security.

However, the composition of UK defence spending recorded against the NATO target has been a subject of sustained criticism. NATO's agreed methodology allows member states to include a wide range of expenditure beyond core military capability: the UK's 2% figure includes spending on veterans' pensions, civilian MoD staff costs, contributions to NATO common-funded budgets, and elements of GCHQ and intelligence expenditure. Analysts at the Royal United Services Institute (RUSI) estimate that spending on directly deployable military capability — equipment, personnel, training and maintenance — amounts to approximately 1.7–1.8% of GDP when these ancillary items are excluded.

The distinction matters because the political debate focuses almost entirely on whether the headline 2% threshold is met, while the operational question — whether the armed forces have the equipment, people and readiness they need — is determined by the composition of spending rather than its aggregate level. The House of Commons Defence Committee has noted that NATO allies including Germany and France achieve higher levels of deployable capability at broadly similar headline spending percentages, suggesting the UK's accounting conventions flatter its effective investment in military readiness.

The National Audit Office's annual Major Projects Report provides the most authoritative independent assessment of MoD procurement. The 2025 edition of the report identified a cumulative funding shortfall in the MoD's 10-year Equipment Plan of approximately £17 billion — meaning the MoD has committed to purchasing equipment it cannot afford at current funding levels. This shortfall is not new: the NAO has identified a structural gap between MoD equipment ambitions and available funding in every Major Projects Report since 2012.

The Equipment Plan covers the procurement and support of major platforms across all three services: the Royal Navy's carrier strike group and submarine fleet, the Army's armoured vehicle programmes, and the Royal Air Force's combat aircraft and air mobility programmes. Flagship programmes including the Ajax armoured vehicle (finally declared in limited service in 2024 after years of delays and technical failures costing an estimated £3.2 billion in additional expenditure) and the Type 26 frigate programme illustrate the wider pattern of optimistic contracting, specification changes during development, and cost escalation that the NAO has consistently documented.

The MoD contests the NAO's methodology, arguing that the Equipment Plan is a planning tool rather than a fixed commitment and that the shortfall figure overstates the risk by not adequately accounting for planned efficiency savings and future spending review settlements. The Public Accounts Committee has consistently rejected this argument, noting that efficiency savings assumed in successive Equipment Plans have not materialised at the projected scale.

The Infrastructure and Projects Authority (IPA) assesses major government programmes against delivery confidence. Of the major defence projects assessed in 2025, 41% were rated as delivering on time and within budget — a figure that has remained broadly stable for a decade despite repeated commitments to procurement reform. The remaining 59% were assessed as amber (some concerns about delivery), amber/red (major risks), or red (successful delivery in doubt).

The MoD's relationship with its major contractors — principally BAE Systems, Babcock, Rolls-Royce, and Leonardo — is characterised by what the NAO describes as "dependency" rather than a competitive market dynamic. For many critical capabilities, single-source contracting is unavoidable because only one domestic supplier exists with the relevant expertise. The Single Source Regulations Office (SSRO) regulates profit rates on single-source contracts, but its 2025 annual report noted that the MoD continued to lack adequate data on contractor cost structures in a significant proportion of the contracts it oversees.

The Defence and Security Industrial Strategy, updated in 2025, committed to maintaining domestic industrial capacity in specified sovereign capability areas including nuclear submarines, combat aircraft, and certain munitions. The strategy explicitly accepts higher costs in some cases as the price of maintaining skills and production capacity in the UK rather than relying on imports — a trade-off the National Security Council has endorsed but which is not systematically disclosed in public spending assessments.

Beyond the equipment programme, defence analysts and the Commons Defence Committee have raised persistent concerns about the readiness of UK armed forces to fulfil their NATO commitments. The regular armed forces are below their authorised strength for the third consecutive year: as of April 2026, total trained strength stood at approximately 144,000 against an establishment of 153,000 — a shortfall of around 9,000 personnel. The Army has experienced the most acute recruitment and retention difficulties, with trained strength approximately 7% below establishment.

The MoD's Recruiting Partnering Project — a 10-year outsourcing contract awarded to Capita in 2012 — has been the subject of sustained criticism for failing to meet recruitment targets. Capita's contract was allowed to expire in 2022, and the MoD brought recruiting back under direct military control, but the transition period saw recruitment numbers fall to their lowest level since the 1990s. Recovery has been slower than projected.

NATO's 2025 assessment of UK force contributions found that the UK met its headline commitments for the alliance's forward presence in Estonia and its air policing contributions, but noted that several of the UK's declared high-readiness land force commitments could not be fully resourced simultaneously with current trained strength. This assessment — disclosed in NATO's Allied Command Operations report — received limited coverage in the UK national press.