Three forces on one curve
The Bund curve in mid-2026 is the resultant of three forces that do not point the same way. The ECB's June hike to a 2.25 percent deposit rate anchors the front end higher: the 2-year Schatz trades near 2.63 percent. The end of the Iran war, sealed by the Hormuz reopening, pulled oil and inflation expectations lower and dragged the 10-year down toward 2.93 percent, its lowest since April. And underneath both sits the structural force that will define the Bund market for years: a supply wave from the debt-brake reform and the €500 billion fund that turns Germany from a scarcity asset into a steadily growing issuer.
Real yields, the variable that matters
For an economy trying to finance a generational investment programme, the real yield - the nominal Bund yield less expected inflation - is the number that matters, and it has risen. With the 10-year near 2.93 percent and inflation expected to grind back toward 2 percent over the medium term, the real yield on German duration is now clearly positive and at its highest in over a decade. That is the mechanical consequence of an ECB that hiked to contain a shock while the disinflation trend continues underneath. Positive real yields are healthy for savers and for long-term capital allocation, but they raise the hurdle rate for exactly the private investment the fiscal plan needs to crowd in.
The cruel irony for Berlin is that its own fiscal expansion adds to the upward pressure on real yields - more issuance, more growth, more inflation risk - at the same time as the ECB's hike does. The fiscal authority is partly financing itself at rates its own policy is helping to lift.
The supply wave
The most underappreciated structural story in European rates is the transformation of the Bund's scarcity premium. For a decade the Bund was the euro area's scarce, precious risk-free asset, its yield depressed by limited issuance and heavy ECB holdings. The debt-brake reform changes that. Germany will issue substantially more debt to fund the infrastructure fund and the defence build-out, and quantitative tightening means the ECB is no longer absorbing it. More supply, less central-bank demand, and a higher policy rate together argue for a structurally higher and steeper Bund curve over the medium term than the 2015-2021 regime conditioned investors to expect.
| Dimension | 2015-2021 | 2026 onward |
|---|---|---|
| Issuance | Constrained by debt brake | Expanding via reform + fund |
| ECB holdings | Rising (QE) | Falling (QT) |
| Policy rate | Negative to zero | 2.25% and data-dependent |
| Scarcity premium | Large | Eroding |
| Curve | Flat / inverted, low | Positive, higher |
Spreads: the periphery that will not widen
The Bund's role as the euro-area benchmark is visible in spreads, and the striking feature of 2026 is how contained they are despite the supply wave and the war. The OAT-Bund spread sits around 69 basis points - elevated by French political and fiscal noise but far from crisis levels - and Italian and other peripheral spreads have compressed, with the France-Italy gap narrowing toward a handful of basis points. The ECB's Transmission Protection Instrument backstop, a calmer political backdrop in the periphery, and investor demand for euro duration have kept spreads orderly. For now, the German benchmark is doing its job: anchoring the bloc rather than fragmenting it.
The risk to watch is not the periphery but the core. If the Bund supply wave lifts the entire euro curve, it raises financing costs for every sovereign, and the most fiscally stretched - France above all - feel it first. The Bund is the anchor, but a heavier anchor drags the whole chain.