Europe’s Defence Bill Is Rising: What It Means for Government Debt

Europe has committed to spend much more on security while many governments already carry large debts. At the 2025 NATO summit in The Hague, allies agreed to work towards 5% of GDP a year by 2035: at least 3.5% for core defence and up to 1.5% for security-related investment such as infrastructure, resilience and industry.

The European Union has created room and financing to support that shift. Its Readiness 2030 framework includes national fiscal flexibility and the SAFE instrument, which can provide up to €150 billion in long-maturity loans for defence procurement. But neither mechanism makes the cost disappear. Loans still have to be repaid, and flexible fiscal rules still leave countries with higher expenditure, deficits or taxes.

What did NATO countries actually promise?

The 5% figure has two parts. At least 3.5% of GDP is intended for core defence under NATO’s established definition. Up to 1.5% can cover defence- and security-related areas including critical infrastructure, cyber defence, civil preparedness, innovation and the defence industrial base.

The target date is 2035, not 2026. Allies must submit national paths and the balance will be reviewed in 2029. It would therefore be misleading to multiply current GDP by 5% and describe the result as this year’s bill. Governments start from different levels and decide how quickly to increase budgets.

NATO reported that European allies and Canada increased combined defence expenditure by nearly 20% in real terms in 2025. The direction is already clear, but the eventual debt effect depends on how each country funds the rise.

How large is the EU’s financing response?

The Commission’s Readiness 2030 plan estimated that defence investment could reach at least €800 billion over four years if the available mechanisms were taken up. That is an estimate of potential additional investment, not a central EU budget allocation and not guaranteed borrowing.

SAFE is the most concrete common instrument. The EU raises funds and lends them to participating member states on competitive, long maturities. The money supports eligible defence capabilities, generally through joint procurement. Because these are loans rather than grants, they create a repayment obligation for the beneficiary country.

What do the fiscal escape clauses change?

The EU fiscal framework normally constrains the growth of nationally financed net expenditure and can require adjustment from countries with excessive deficits. The defence-related national escape clause allows an eligible rise in defence spending to deviate temporarily from that path within defined limits.

This flexibility reduces the risk that a rapid military build-up forces equally rapid cuts elsewhere. It does not erase the deficit under accounting rules or remove new debt from the national balance sheet. Markets, credit analysts and Eurostat still observe the underlying finances.

That is why “defence is exempt” is an inaccurate shortcut. The flexibility changes the pace and treatment of fiscal adjustment; it does not turn expenditure into revenue.

Why the starting debt ratio matters

At the end of Q1 2026, France had government debt of 117.6% of GDP, Belgium 109.1% and Italy 138.9%, according to Eurostat. Germany stood at 64.4% and Poland at 61.6%. A similar permanent spending increase can have very different consequences across those starting points.

High-debt countries are not automatically unable to invest in defence. They may have deep bond markets, long average maturities and substantial tax capacity. But they have less room for error when growth disappoints or interest costs rise. Lower-debt countries can borrow more easily, though they still face industrial capacity and political trade-offs.

The debt-to-GDP comparison supplies context, but it cannot decide whether a defence programme is affordable on its own. The timing, financing structure and economic return matter too.

Four ways defence spending can affect debt

1. Direct borrowing: if a government increases expenditure without higher revenue or cuts elsewhere, its deficit and debt normally rise.
2. EU-backed loans: SAFE may lower rates or lengthen maturities, but the national borrower still repays principal and interest.
3. Growth and capacity: domestic production and infrastructure can support output, while imports may create less domestic tax revenue. Bottlenecks can push prices up.
4. Risk reduction: credible defence may reduce the economic cost of security threats, but that benefit is difficult to quantify and does not create immediate budget cash.

The outcome is therefore not “defence versus debt” in a simple one-year contest. It is a long-term portfolio choice under uncertainty.

Can joint procurement save money?

Potentially. Common orders can increase scale, reduce incompatible systems and give industry clearer demand. SAFE is designed around that logic. Savings depend on execution: specifications must converge, contracts must be competitive and production must expand quickly enough.

Joint buying can also be slower when governments disagree on suppliers or technical requirements. An instrument’s maximum size is not evidence that every euro has already produced equipment or efficiency.

What would responsible financing look like?

A credible plan separates temporary investment from permanent operating costs. Factories, infrastructure and equipment have multi-year value; salaries, maintenance and ammunition replenishment recur. Funding recurring commitments entirely with debt creates an increasingly difficult baseline.

Governments should publish annual paths that show the defence definition used, expected procurement, financing source, interest cost and effect on the medium-term deficit. Transparent milestones allow citizens to judge whether additional borrowing creates usable capacity.

The debt question also cannot be isolated from priorities. Higher taxes, lower non-defence spending and more borrowing each distribute the cost differently. Fiscal flexibility gives time for that choice; it does not avoid it.

What should readers watch?

• National implementation paths towards the 3.5% core and 1.5% broader targets.
• Actual SAFE loan agreements and disbursements, not only the €150 billion ceiling.
• Whether procurement becomes more joint and whether industrial delivery improves.
• Observed deficits, debt ratios and interest expenditure after the new spending begins.
• The 2029 NATO review and any changes to EU fiscal treatment.

Track the recorded outcomes on the EU Debt Map. The map reports observed public debt; it does not assume that every announced defence envelope becomes borrowing.

FAQ

Does NATO require every EU country to spend 5% now?

No. The commitment is for NATO allies to reach 5% by 2035 through national paths. Not every EU member is a NATO ally, and the target includes both core defence and broader security-related spending.

Is SAFE a €150 billion grant fund?

No. SAFE provides up to €150 billion of loans to participating member states. The terms may be attractive, but the principal must be repaid.

Are defence expenses excluded from public debt?

No. Fiscal flexibility can change the required adjustment path. Borrowing still adds to public liabilities and remains visible in debt statistics.

Conclusion

Europe can finance a stronger defence, but the method matters. The NATO commitment sets a large long-term direction; the EU escape clauses provide time; SAFE offers coordinated loans. None eliminates the budget cost.

Countries with high debt need especially clear sequencing and transparency. The sustainable answer combines security needs with realistic revenue, controlled recurring costs, joint procurement and an honest account of borrowing. Defence may be necessary, but necessity does not repeal arithmetic.

Sources and methodology

• NATO: the 5% defence commitment
• European Commission: Readiness 2030
• Council of the EU: SAFE instrument
• Eurostat: government debt, Q1 2026