Berlin’s €203 billion debt-brake detour

Germany's federal auditors warned parliament on 3 September that the government is heading into a debt trap. Federal debt could double from roughly €1.5 trillion at the end of 2020 to at least €3 trillion by 2030 if Berlin follows through on its current spending plans (FAZ, Bundestag). That matters well beyond Germany. Europe's largest economy is borrowing heavily for its own defence and infrastructure. At the same time, it is pushing to cut roughly €400 billion from the next EU budget (Investir/Les Echos). A more indebted Berlin means a less generous one for the rest of the continent.

How €200 billion a year slips past the debt brake

The Bundesrechnungshof (the body that checks whether the federal government spends money lawfully) is not predicting a sovereign crisis. It is warning that borrowing is being channelled around Germany's debt brake, the constitutional rule that caps the federal structural deficit at 0.35% of GDP (Bundestag). That rule was meant to stop normal budgets from running large deficits. A March 2025 constitutional amendment punched two holes in it. Defence spending above 1% of GDP is now exempt. And a new €500 billion infrastructure and climate fund can borrow on its own account over twelve years (BMF).

The result is a steep borrowing ramp. Core federal net borrowing rises from €98 billion in 2026 to €167.3 billion in 2030. Combined new borrowing in 2027 alone reaches roughly €203 billion when special funds are included (Bundestag, Onvista/Reuters).

The interest bill shows where borrowing turns into lost choices. The government's own projections put interest spending at €80.7 billion by 2030, against total federal spending of €635.4 billion (Bundestag). Roughly one euro in eight would go to debt service. That is money the budget must pay before it can fund schools, rail or tax relief.

Borrowed money, unbuilt bridges

The case for borrowing is real. The Bundesbank has said Germany's net fixed investment turned negative in 2024 and 2025 for the first time since reunification, meaning the country wore out roads, railways and energy grids faster than it replaced them (Bundesbank).

But authorising debt is easier than building things. The ifo Institute found that in 2025 the government borrowed €24.3 billion through the infrastructure fund while federal investment rose only €1.3 billion (ifo). Most of the new debt replaced money the budget would have spent anyway rather than paying for extra capacity. Zeit reported that only about 10% of the infrastructure fund had been used so far (Zeit). The Finance Ministry argues that the fund's real impact should be judged over 2025–2028 (BMF), but that is a promise, not a result.

Who pays across Europe

When Germany borrows more, the cost of borrowing rises for everyone in the eurozone. German bonds are the reference price for "safe" debt in Europe. If that baseline rises, investors demand more from every other government too. German 10-year yields have already pushed above 3.36%, hitting 15-year highs (Euronews, Le Monde). France, carrying public debt at 115.6% of GDP (Insee), is already under an EU excessive-deficit procedure (a formal process that forces governments running oversized deficits to cut spending or raise taxes). Its Senate estimates that France's contribution to the next EU budget could jump from €26 billion to €36 billion annually (Sénat). Higher market rates make that squeeze worse.

The political fallout lands on the next seven-year EU spending plan for 2028–2034, which the Commission has proposed at around €2 trillion (European Commission). Six net-contributor countries, including Germany and the Netherlands, are demanding deep cuts (NOS). Poland worries that German budget pressure means cuts to cohesion funds, while about 28% of Polish exports go to Germany, making German stagnation a direct risk to Polish producers (Rzeczpospolita).

Germany's partners now have evidence for a hard suspicion: Berlin can make room for German priorities faster than it can make room for shared European ones. Whether that changes depends on something the auditors' report leaves open: whether the infrastructure fund turns into real investment, or remains a way to relabel old spending with new debt.