Germany's defence spending sprint toward 2029: fiscal and political constraints create a "triple lock"

Overview

This report focuses on the fiscal and political rationale behind Germany's accelerated increase in defence and security spending through 2029. Deutsche Bank notes that, after reforming the debt brake, the Merz government is fulfilling its "whatever it takes" defence commitment through higher budgets and debt financing. The report's core conclusion is that German defence spending has clear upward rigidity through 2029, with the current medium-term fiscal plan more likely to represent a spending floor.

Core views

The report argues that the German government has established reaching or exceeding NATO's 3.5% target by 2029 as a highly certain policy objective. Supporting factors include NATO's assessment of the timeline for a potential Russian military threat, the possibility that political changes in the United States in 2029 could weaken NATO commitments, domestic political tail risks associated with Germany's next federal election, and fiscal-rule pressure that could emerge after the EU defence-spending escape clause expires at the end of 2028. Together, these factors create a "triple lock" on German defence spending over the next three years.

Analysis framework

The report combines macro-fiscal policy analysis, budget-path decomposition, assessment of political constraints, and evaluation of defence procurement strategy. The focus is not on corporate earnings or individual-stock valuation, but on the impact of changes to Germany's fiscal system, debt-financing capacity, NATO targets, EU fiscal rules, and the political window around 2029 on the path of defence spending.

Methodology notes

• Macrofiscal analysisAnalysis of debt-brake and fiscal-rule constraints

  Germany's amended debt brake excludes most defence spending from the constitutional borrowing constraint, with only defence spending up to 1% of GDP counted toward the constraint.

  Based on this, the report concludes that Germany's capacity to finance defence spending through borrowing is relatively weakly constrained under domestic law, while EU fiscal rules may become a more important medium-term constraint after 2028.

• Policy and political economy2029 political-window analysis

  External security, US policy, the German election, and EU rules will create a concentration of risks around 2029.

  The report views these risks as important reasons for the German government to expand the budget early, prioritise conventional equipment that can be delivered, and demonstrate domestic results.

• Defence procurement strategySecond-best procurement strategy assessment

  Under time pressure, prioritising the completion of conventional capabilities and domestic capacity rather than fully shifting toward a unified European market or cutting-edge technology systems.

  The report believes this strategy may not be optimal in the long term, but it can help create visible military capability and domestic political returns before 2029.

Asset mapping & comparison

Structured mapping from thesis to named assets (strengths, weaknesses, peers, risks).

• German sovereign bonds and euro rates

  Expanded defence spending and additional debt financing could increase bond supply and attention to fiscal deficits.

  Strengths

  The domestic debt brake places relatively weak constraints on defence spending, leaving substantial short-term financing capacity.

  Weaknesses

  Higher borrowing needs could raise term premia and increase doubts about fiscal sustainability.

  Comparison

  Compared with the special infrastructure fund, the defence-spending exemption has greater persistence and a more significant impact on the fiscal system.

  Risks

  Renewed constraints from EU fiscal rules, an excessive-deficit procedure, inflation, or rising interest rates.

• German and European defence industrial chain

  Budget expansion, replenishment demand, and a preference for domestic orders provide demand support for German defence contractors.

  Strengths

  Strong policy commitment, a clear spending path, and recent orders flowing predominantly to German companies.

  Weaknesses

  The preference for conventional equipment may limit long-term technological spillovers and the efficiency of European integration.

  Comparison

  Poland has a higher share of investment in new-paradigm systems, while Germany has recently placed greater emphasis on conventional capabilities and domestic delivery.

  Risks

  A change of government after 2029, changes in procurement structure, rising costs, and delivery bottlenecks.

• Euro and European macro risk assets

  Fiscal expansion, defence investment, and changes in European security policy will affect growth, interest rates, and risk appetite.

  Strengths

  Defence spending may provide some demand stimulus and industrial investment.

  Weaknesses

  If disputes over fiscal rules intensify, policy credibility could weaken.

  Comparison

  Germany has greater borrowing capacity than other European countries, but it also faces stronger institutional reputational constraints.

  Risks

  A deterioration in NATO's security environment, uncertainty over US policy, and conflicts with EU rules.

Key data

• 2027 defence and security budgetApproximately EUR160bn, or about 2.7% of GDPHigher than the 2.1% allocation in the 2026 budget and above the previous medium-term fiscal plan.
• Planned 2028 defence budgetApproximately EUR171bn, or about 3.5% of GDPThis implies that Germany plans to reach NATO's 3.5% target by 2029 at the latest.
• Planned 2029 defence and security spending as a share of GDPApproximately 3.6% of GDPThe report says this is roughly equivalent to one euro in every three euros of the core budget being allocated to defence and security.
• Cumulative spending plan for 2025-2029Approximately EUR730bnFurther increased from approximately EUR640bn in the fiscal plan issued the previous autumn.
• Debt financing volumeAt least approximately EUR500bnPrimarily supported by the debt brake's more lenient treatment of defence spending and the special armed forces fund established in 2022.
• Polling support for Germany's centrist partiesApproximately 48%The combined support for CDU/CSU, SPD, and the Greens is only barely sufficient to maintain a parliamentary majority, creating a 2029 election risk.
• Share of procurement allocated to new-paradigm systemsBelow 10% in Germany, approximately 16% in PolandThe Kiel Institute estimates that Germany's recent procurement has allocated relatively little to new types of systems such as autonomous platforms.
• Destination of recent order flowsNearly 90% directed to German companiesThe report points out that procurement is more heavily oriented toward domestic German suppliers and conventional equipment.

Impact & implications

The report's investment implications are primarily at the macro and cross-asset levels: German sovereign bond supply and fiscal-deficit pressures may increase, while EU fiscal rules could become a market focus after 2028; the defence industrial chain, particularly traditional German equipment, replenishment, and security-related infrastructure, may benefit; however, if budget expansion drives up interest rates, inflation, or concerns about fiscal credibility, fixed-income and euro assets could face volatility.

Risks

• After the EU defence-spending escape clause expires at the end of 2028, Germany may find it more difficult to avoid an excessive-deficit procedure.
• Germany's 2029 federal election could weaken the centrist majority supporting debt-financed defence budgets.
• If the United States adopts a more isolationist NATO policy after 2029, pressure on European security could increase further.
• Price increases in the defence industry and supply bottlenecks could cause the current budget to underestimate actual spending needs.
• The preference for conventional weapons and domestic orders may come at the expense of long-term technological upgrading, integration of the European defence market, and economic spillover effects.

What to watch

• Whether Germany's 2028 draft budget further increases defence spending.
• Whether Germany transfers more security-related infrastructure projects, such as railways, roads, and bridges, from the infrastructure fund into the defence budget.
• Whether the EU extends the defence-spending escape clause or adjusts the way fiscal rules are enforced.
• Polling changes for CDU/CSU, SPD, the Greens, and AfD before 2029.
• Whether the shares of new-paradigm systems, autonomous platforms, and European suppliers in German defence procurement increase.
• German sovereign bond supply, term premia, and market reactions to fiscal credibility.