The European Central Bank heads into its 10 September meeting with one decision largely priced and the next decisions very much open. Markets were assigning a 100% probability to a 25-basis-point rise in the deposit rate to 2.50% as of 4 September. The Governing Council meets in Berlin, with the policy decision due at 14:15 CET and the press conference at 14:45.
The catalyst is a renewed inflation shock. Euro-area annual inflation rose to an estimated 3.3% in August from 2.9% in July. Energy inflation accelerated to 14.3%, up from 10.3%, while services eased to 3.0%. The composition matters because it leaves the ECB responding to a supply shock rather than an economy simply overheating from excess demand.
The ECB raised rates by 25 basis points in June and paused in July. The deposit rate has remained at 2.25%, the main refinancing rate at 2.40% and the marginal lending rate at 2.65%. Minutes of the July meeting show that all members backed the pause, with officials focused on the duration, intensity and propagation of the energy shock.
That framework explains why a September increase does not automatically imply a long sequence of hikes. Higher interest rates cannot produce more oil or gas. They can, however, reduce the risk that a jump in energy costs spreads into corporate pricing, wage bargaining and inflation expectations. The longer the shock lasts, the stronger the case for leaning against those second-round effects.
The problem is growth. June Eurosystem projections put euro-area expansion at just 0.8% in 2026, followed by 1.2% in 2027 and 1.5% in 2028. Inflation was projected at 3.0%, 2.3% and 2.0% respectively. The ECB is therefore tightening into an economy that is resilient enough to avoid a sharp downturn but weak enough for financing costs to matter.
Credit transmission is already visible. In July the ECB said mortgage demand had declined, while its Economic Bulletin described tighter mortgage lending standards in the second quarter. The corporate equivalent is straightforward: a higher risk-free rate raises the hurdle for investment, refinancing and acquisition activity, particularly for leveraged businesses.
For British investors, the ECB decision matters even outside the single currency. Euro-area rates affect European bond yields, bank funding costs and the relative attractiveness of euro assets. They also influence demand in the UK's largest neighbouring market. A longer European tightening cycle would therefore feed into portfolio allocation, corporate financing and cross-border trade assumptions.
The market's near-term conviction is much stronger than its medium-term certainty. The ECB's own Survey of Professional Forecasters showed a modal deposit rate of 2.50% for the fourth quarter of 2026 and the first quarter of 2027, with a gradual move back towards 2.00% over the medium term.
That is a contained tightening story: one more hike, perhaps a period on hold, and eventual normalisation. The risk to that view is persistence. If energy remains expensive and broader inflation follows, the ECB may need to keep rates higher for longer or raise again. If the shock fades without destabilising long-term expectations, 2.50% could prove close to the peak.
The most important information on Thursday may therefore sit in the new projections and the language around propagation rather than in the quarter-point move itself. The ECB has deliberately avoided forward guidance. Investors will have to infer the next step from how it describes the path from energy prices to wages, credit and underlying inflation.