At its November 2022 peak, excess liquidity in the euro area reached €4.7 trillion — roughly 14% of every euro-area bank’s total assets, combined. That extraordinary stockpile, built through years of bond purchases and cheap multi-year lending, is now draining at pace. Excess liquidity is expected to fall further over the coming years, according to ECB estimates, with about €2.5 trillion in maturing bonds still to be absorbed by the market by the end of 2027.

The scale is unprecedented. So is the question hanging over Frankfurt: what happens when the money stops?

What the stimulus built

Between the ECB’s asset purchase programmes and its pandemic emergency purchase programme (PEPP), the central bank became the euro area’s dominant bond buyer. The PEPP alone reached a total envelope of €1.85 trillion after successive expansions in 2020. At its peak, the combined effect of the ECB’s bond holdings depressed ten-year sovereign yields by approximately 175 basis points, according to ECB research cited by Executive Board member Piero Cipollone in a February 2025 speech.

The stimulus worked as designed. Borrowing costs stayed near zero. Governments funded pandemic responses. Banks were flooded with reserves through targeted longer-term refinancing operations — cheap, multi-year loans that peaked alongside the bond purchases.

But the money left its mark. Banks grew accustomed to effectively free liquidity. Asset prices rose across the board. And the euro-area financial system became dependent on a central bank balance sheet that was, by any historical standard, grotesquely large.

The drain

The unwinding began in late 2022. First came the repayment of the TLTROs. Then the gradual run-off of the ECB’s bond portfolios. The PEPP discontinued reinvestments at the end of 2024. The remaining PEPP portfolio still holds roughly €1.38 trillion in securities, with an estimated €142.7 billion maturing in 2026 and €148.1 billion in 2027, according to ECB data as of March 2026.

Excess liquidity has already fallen from that €4.7 trillion peak by more than €2 trillion in roughly three years, according to Executive Board member Isabel Schnabel’s November 2025 assessment, and has continued to decline since. With about €2.5 trillion in maturing bonds still to be absorbed by the market by the end of 2027, per Cipollone, the trajectory has a long way to run.

ECB research puts the transmission mechanism in concrete terms: each €1 trillion reduction in bond holdings raises ten-year sovereign yields by approximately 20 basis points on average. The easing impact of the ECB’s portfolio has already fallen from 175 basis points at peak to roughly 75 basis points. That remaining 75 is eroding every month.

The problem of opposing forces

This is where the arithmetic turns uncomfortable. The ECB has been cutting policy rates. But rate cuts and balance sheet reduction push in opposite directions — rate cuts press down on short-term borrowing costs while the liquidity drain pushes long-term yields up. The result is a steepening yield curve that may not deliver the net easing the ECB’s governing council intends.

Cipollone was direct about the risk in his February speech: the decline in excess liquidity “could exert additional tightening pressures on financial and financing conditions, potentially exceeding the intended policy stance.”

Lending data already tells a cautious story. Growth in lending to firms sat roughly two-thirds below its historical average. Housing loan growth remained at about one-fifth of its long-term average. The loan-to-GDP ratio has continued to decline — meaning credit expansion has not kept pace with the nominal growth of the economy.

The opening argument

The ECB’s public posture is composed. Executive Board member Isabel Schnabel, speaking in November 2025, described the normalisation as “remarkably smooth.” Ten-year sovereign yields stand almost exactly where they were when the run-off began in March 2023. Banks have purchased sizeable amounts of government bonds to replace lost reserves, keeping aggregate liquidity coverage ratios well above pre-pandemic levels.

The new operational framework adopted in March 2024 provides a safety valve: standard refinancing operations offer unlimited liquidity at a fixed rate against broad collateral. In Schnabel’s framing, this “decouples” the pace of balance sheet reduction from interest rate control. If money market rates rise too far, banks simply borrow more from the ECB.

This is the institution’s opening argument — technically sound, carefully constructed, and designed to prevent alarm. It may well be correct. But “so far, so good” is not the same as “through to the end.” The ECB’s own 2024 targeted reviews found that banks still have “room for improvement” in their ability to mobilise collateral quickly. No financial system has navigated a liquidity withdrawal of this magnitude.

The timing sharpens the risk. Euro-area governments face rising defence spending commitments and an energy transition that demands capital. Cipollone himself noted that geopolitical fragmentation is making the global economy “more shock-prone” — a judgement that has not aged poorly. Governments that once relied on the ECB to cap their borrowing costs will soon face those costs alone.

The pandemic money machine is shutting down. By the time it finishes, well over €2 trillion will have left the system. The ECB insists the plumbing can handle it. The next eighteen months will test that claim.

Sources