Luxembourg charts a cautious path to NATO's 5% goal, one tenth of a point at a time

Luxembourg, NATO's smallest member, has set out how it intends to begin closing the distance between an ambitious alliance-wide spending pledge and its own fiscal reality — and the answer, for now, is one tenth of a percentage point at a time.

On 20 May 2026, Defence Minister Yuriko Backes presented an updated defence-spending roadmap to members of parliament, following the prime minister's State of the Nation address. The plan, agreed by the Government Council, raises military outlays by 0.1 percentage points of gross national income (GNI) each year through 2029. Under that trajectory, spending reaches 2.1% of GNI — EUR 1,373 million — in 2027, 2.2% (EUR 1,513 million) in 2028, and 2.3% (EUR 1,665 million) in 2029.

The increments are modest by design. Backes framed the rise as a careful, calibrated response rather than an aggressive ramp-up, and she was explicit about what the policy is not.

These investments strengthen both our national defence and Europe's collective security. This is not about engaging in an arms race. It is about building credible capabilities that contribute both to the defence of our country and to collective defence.

An incremental start to a steep target

The roadmap is aligned with the commitment all NATO allies made at the alliance's June 2025 summit in The Hague to invest 5% of GDP — or GNI, in Luxembourg's case — in defence by 2035. That headline figure breaks into two parts: at least 3.5% for core defence requirements and up to 1.5% for broader security-related spending, a category that the Hague Summit Declaration of 25 June 2025 defines to include critical infrastructure, resilience and the defence industrial base. Allies agreed to a collective review of progress in 2029.

That review date matters. Luxembourg's publicly declared pace of 0.1 points a year runs only as far as 2029 — the same year the alliance takes stock. What happens after that is where the arithmetic turns daunting. Reaching 2.3% of GNI by the end of the decade still leaves the Grand Duchy less than halfway to the 5% destination, implying a far steeper climb in the 2030s than anything the current roadmap commits to.

Backes cast the measured approach as a reflection of national circumstances as much as geopolitics.

This increase in defence spending is a measured response to the challenges arising from the current geopolitical context. It is also a decision that reflects Luxembourg's national circumstances.

A near fourfold rise, and a EUR 13.4 billion bill

The scale of the eventual commitment is laid bare by Luxembourg's national finance council, the Conseil national des finances publiques (CNFP). Its estimates put the cumulative additional cost of reaching the 5% GNI target between 2025 and 2035 at EUR 13.4 billion. Annual defence expenditure would rise from about EUR 1.18 billion in 2025 to roughly EUR 4.63 billion in 2035 — a near fourfold increase over the decade.

The gap between the gentle gradient through 2029 and the quadrupling required by 2035 captures a wider tension running through the Hague commitments: even wealthy, small states are stretching to keep pace, and the political pledge sits some distance ahead of any concrete spending plan that has yet been tabled.

• 2027: 2.1% of GNI (EUR 1,373 million)
• 2028: 2.2% of GNI (EUR 1,513 million)
• 2029: 2.3% of GNI (EUR 1,665 million)
• 2035 target: 5% of GNI, roughly EUR 4.63 billion a year

Why Luxembourg measures in GNI

One feature distinguishes Luxembourg's accounting from that of its allies: it benchmarks defence spending against gross national income rather than gross domestic product. The choice reflects the country's unusual economic structure, in which a large cross-border workforce and substantial international activity inflate GDP well beyond GNI. Using the smaller measure produces a more demanding — and, the government argues, more representative — yardstick for what the country can sustainably commit.

Backes, a Democratic Party (DP) politician who has held the defence portfolio since November 2023, also tied the spending plan to the war in Ukraine, presenting it as an expression of solidarity rather than narrow national interest.

Europe's defence begins in Ukraine, and this plan reaffirms Luxembourg's full solidarity with the people and armed forces of Ukraine.

For now, the roadmap to 2029 gives Luxembourg a credible, incremental answer to the question every NATO capital is being asked. The harder question — how a country of its size finances a near fourfold rise in the years that follow — remains open, and the 2029 alliance review is likely to bring it sharply into focus.