The end of Bund scarcity

In early July, the Finanzagentur launched its new ten-year line, maturing August 2036, six billion euros to start, close to forty at completion. A routine issuance, except the routine itself is new: four syndications in the year, an unprecedented twenty-year line, a €511 billion programme. Germany, which spent a decade rationing its debt, is now industrialising it. And the market has already delivered its verdict, discreet but historic: the Bund’s yield has moved above the equivalent swap rate, a first since these two curves have existed. Europe’s most sought-after asset is turning into a bond like any other.

The technical detail that sums it all up fits on a trading screen. On 17 July, the ten-year Bund yielded 3.14%, while the euro swap rate of the same maturity traded below 3%. This negative swap spread, the German state’s yield above the fixed interbank rate, would have sounded absurd to any operator of the 2010s: the gap historically ran the other way, and its width measured the premium investors accepted to pay for holding the risk-free asset par excellence. The reversal, initiated in late 2024 and entrenched since, means one simple thing: the Bund’s scarcity premium is gone. Our guide on interest rate swaps details the mechanics of this spread; here is the story of its death.

Where the scarcity came from

The Bund of the 2010s and early 2020s was not merely a bond: it was a rationed commodity. The rationing had two mutually reinforcing sources. On the supply side, the constitutional debt brake and the cult of the “schwarze Null”, the balanced budget, kept net issuance close to nil: some years Germany repaid more than it borrowed. On the demand side, the Eurosystem vacuumed up the stock: the purchase programmes removed such a share of federal paper from the free float that Bundesbank research documented a repo “specialness” premium, where borrowing a specific Bund cost more than the cash it secured, including for bonds merely eligible for purchases and never actually bought. The German bond served as the ultimate collateral for Europe’s entire plumbing, the machinery we describe in our analysis of the repo market and collateral, and that unfindable-asset status carried a price: yields crushed below swaps, dips under zero, auctions oversubscribed no matter what.

That world rested on a precise political equilibrium: a state that refuses to borrow, a central bank that buys everything. Both pillars fell in under three years.

The tap opens

The first pillar gave way on 21 March 2025, when Germany reformed its debt brake to exempt defence spending above 1% of GDP and house €500 billion of infrastructure in a special fund, a turn we framed in our guide on European sovereign debt. The translation into paper is immediate: the Finanzagentur’s 2026 issuance programme plans about €511.5 billion of securities against €362.4 billion of redemptions, a net supply in the region of €150 billion, a volume raised by a further €8 billion along the way. Total federal borrowing needs, special funds included, approach €174 billion, more than triple two years earlier, financing among other things a military budget now above €100 billion. The toolkit follows: two new ten-year lines in the year, four syndications including an unprecedented twenty-year line, €16 to 19 billion of green securities. The issuer that used to play hard to get has become an industrial producer of debt.

The second pillar withdrew in silence: the ECB reinvests nothing anymore and its quantitative tightening returns about €500 billion of securities to the market each year. The price-insensitive buyer disappeared at the precise moment supply tripled. The OECD puts a number on the result: since mid-2022, sectors other than the central bank have had to absorb about €430 billion of additional German federal debt, taken up by investors far more price-sensitive, funds, insurers, households, foreigners. The consequence reads on the curve: long-dated European risk-free rates gained more than 40 basis points in 2025 alone, a steepening the ECB itself attributes to the combination of supply and central bank withdrawal.

The chain of consequences

A regime change in the reference asset never stays confined to that asset, and three shifts are already visible. The first concerns how sovereign spreads should be read: the celebrated European convergence, Italy back at 70 basis points, owes part of its existence to a moving denominator. When the Bund cheapens under the weight of its own supply, the gap with everyone else compresses without the periphery doing anything more; a portion of the advertised “normalisation” of spreads is in reality a banalisation of Germany. A reading grid to keep in mind when interpreting the tightening of the BTP-Bund and OAT-Bund spreads.

The second touches the valuation reference. When the safest sovereign yields more than the swap, the swap curve, anchored to the €STR, becomes the de facto pricing yardstick: it is already the curve on which European Union bonds are priced, along with agencies and a growing share of credit, a path American markets travelled before Europe, Treasury swap spreads having been negative for years. The Bund remains the hedging instrument and the futures underlying, but its monopoly on the risk-free rate is now shared.

The third is, for once, good plumbing news: with German collateral abundant again, specialness premia evaporate, quarter-ends strain less, and the European repo market breathes more easily than in the days when every borrowed Bund was a treasure. Scarcity carried a discreet systemic cost; its end is a dividend of the same order.

The other reading: scarcity does not die, it sleeps

The picture deserves its counterpoints, because burying the Bund’s haven status would be premature. First, the yardstick of stress: in every episode of tension, from June’s oil shock to French fever spikes, money still flees toward Germany, and redenomination risk, were it ever to awaken, would make the Bund the most sought-after asset on the continent within hours; the scarcity premium is cyclical, the German insurance policy is not. Second, the arithmetic: even at €174 billion of annual borrowing, Germany started from debt of about 63% of GDP, the lowest of the large advanced economies, and its absorption capacity remains unmatched; the market is charging for supply, not doubting the signature. Third, depth: a larger, more liquid pool serves benchmark status over the long run, as the US Treasury has demonstrated for decades, having survived its own swap spreads’ move into negative territory without damage. The optimistic version of the same phenomenon reads like this: the Bund stops being a collector’s item and becomes a genuine asset class, and Europe gains the deep bond anchor it lacked, a natural complement to the common debt pool under construction.

Between the two readings, one point of agreement exists: the old regime is not coming back. Neither the fundamentalist version of the debt brake, buried by geopolitics, nor massive ECB purchases, with the balance sheet still shrinking, will make the Bund a rationed asset again on any foreseeable horizon.

The arbiters

What follows will be tracked on a handful of screens. The ten-year swap spread first: a deeper plunge would say absorption is still forcing the discount, a drift back toward zero that the market has digested the new volume. German auctions next, cover ratios and tails, read with the same grid as American auctions: the day a German syndication struggles, the regime will have shifted another degree. The slope of the curve again, the German ten-to-thirty segment pricing the compensation demanded for long duration once supply settles in. And Thursday’s ECB meeting finally, since any further tightening stacks on top of this supply shift: the mix of rate hikes, QT and tripled German issuance is precisely the configuration our analysis of the 2011 remake flags for watching. Germany spent ten years proving that a state can be too lightly indebted for markets to function well. It will spend the coming decade testing the converse.

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Primary sources: Deutsche Finanzagentur, 2026 issuance outlook (18 December 2025) and Q3 update (25 June 2026): €511.5 billion of issuance, €362.4 billion of redemptions, new lines and syndications; ECB, blog “Sloping up: the repricing of euro area yields in 2025” (16 January 2026): long risk-free rates up more than 40 basis points in 2025; Bundesbank (research), “The Eurosystem’s asset purchase programmes, securities lending and Bund specialness”: specialness and eligibility premia in German repo; OECD, Global Debt Report 2026, investor base chapter: €430 billion absorbed outside the central bank since mid-2022.

Market and analysis: Trading Economics, Bund at 3.14% on 17 July 2026; Blue Gamma, euro swap rates; TwentyFour AM on negative swap spreads; Amundi Research, “Swap Spreads: Analysis & Outlook”; Bloomberg on the borrowing programme increase (14 November 2025); Finance Unlocked on euro pricing conventions; Bruegel on the debt brake reform. Figures and dates checked against the sources cited; the swap spread moves continuously, levels quoted are those of mid-July 2026.