The ECB Does Not Set Interest Rates. Rome Does.
Italy is about to overtake Greece as the Eurozone's most indebted country. Not because of a crisis. Because the arithmetic ran its course.
This year, Italy is expected to overtake Greece as the most indebted country in the Eurozone. That sentence requires a moment to absorb. Greece — the country that triggered a sovereign debt crisis in 2010, required three successive bailouts, and became synonymous with fiscal failure — will no longer hold the record. Italy will. Not because of a crisis. Not because of a shock. Because the arithmetic of slow accumulation has simply run its course.
Italy’s fiscal watchdog puts the debt-to-GDP ratio at 137.1 percent for 2025, rising to 138.6 percent in 2026. According to IMF estimates, Italy’s ratio is set to reach 138.4 percent this year, compared to 136.9 percent for Greece. The watchdog ran thousands of statistical simulations of those projections. Roughly half produced worse outcomes than the government forecast. The planned privatization revenues — nearly €20 billion over three years — were flagged as optimistic by the same body that noted Italy has consistently missed earlier privatization targets. The independent court of auditors has previously described such plans as window dressing. Eunews
This is not a story about Italian mismanagement. It is a story about what happens when a monetary union is built without a fiscal one, and what institution ends up holding the consequences.
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On September 8, 2022, the European Central Bank raised its key interest rate by 75 basis points, the largest single move in its history to that point. In Frankfurt, economists praised the decisive shift. In Rome, a different calculation had already begun.
Italy’s public debt now stands at over €3 trillion, 137 percent of GDP. To illustrate what interest rates mean at this scale: in 2021, when the average rate on Italian debt was around 1.5 percent, the annual interest bill was manageable. At four percent — a level that prevailed in Europe before the financial crisis — Italy would pay roughly €120 billion annually in interest alone, more than its entire education and defense budgets combined. The country issued over €550 billion in new and refinanced debt in 2025 alone. Each percentage point of rate increase translates immediately into billions of additional servicing costs, with no offsetting policy lever available. Pravda EUMEF
Within 24 hours of the ECB’s September 2022 announcement, the spread between Italian and German government bonds had widened sharply. Markets were testing how far Frankfurt would go. The answer had already been given weeks earlier: on July 21, Christine Lagarde had announced the Transmission Protection Instrument, a program for unlimited bond purchases should spreads rise in ways deemed “unjustified.” The announcement alone calmed markets immediately.
The signal was unambiguous. The ECB would raise rates, but only as far as Rome, Madrid, and Athens could absorb. Lagarde called this “fragmentation protection.” Markets had a more precise term: fiscal dominance. The ECB retained its formal independence. Its functional independence was already gone.
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The arithmetic is not contested. A state’s debt ratio stabilizes when its nominal growth rate exceeds the interest rate on its debt, provided its primary budget is roughly balanced. When the rate falls below growth, the ratio shrinks. When it exceeds growth, it compounds upward.
The mechanism is visible in Italy’s own recent numbers. Real GDP growth is projected at 0.4 percent in 2025, with the primary surplus rising to 0.9 percent of GDP. The debt ratio is set to reach 137.2 percent of GDP by 2027, as the expected primary surpluses remain insufficient to offset the impact of debt-increasing interest-growth-rate differentials. In plain terms: Italy is running a surplus, growing modestly, and its debt ratio is still rising. The gap between what it earns and what it owes in interest is the problem — and that gap is determined in Frankfurt, not Rome. Economy and Finance
Italy cannot afford sustained high interest rates. Not because of fiscal recklessness — the primary surplus demonstrates the opposite. The problem is structural: at this level of debt, even moderate rates become unsustainable. The country’s fiscal trajectory depends not on its own policy choices, but on the ECB’s.
Frankfurt knows these numbers. Italy, Spain, France, and Greece together account for roughly 60 percent of Eurozone GDP. A rate policy that destabilizes this group destabilizes the currency. The ECB operates under an implicit ceiling: rates may not rise beyond what the most indebted large economies can service. No government issues instructions to the central bank. Fiscal reality does.
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This was not supposed to happen. The Eurozone was designed as a monetary union without a fiscal union, on the theory that market discipline would substitute for fiscal transfers. The theory was coherent. The outcome was fiscal dominance.
The United States issues Treasuries — a single globally liquid asset, underpinned by structural dollar demand that exists regardless of yield. Every Eurozone state issues its own bonds. German Bunds are safe assets; Italian BTPs are not. A rate increase hits Italy harder than Germany. The ECB must manage that spread as a side condition of every monetary policy decision it makes.
Mario Draghi’s “whatever it takes” in July 2012 was not a free choice. It was the only available response to a union whose architecture had produced an institution forced to rescue the currency by redefining its own role. The Outright Monetary Transactions programme was never activated. The announcement was enough. Italian yields fell from near seven percent to under three percent within months. A decade of near-free government financing followed, during which debt ratios continued to climb. Lagarde’s successor instrument — the TPI, with no defined activation threshold and a trigger condition Frankfurt alone determines — replaced it as the standing backstop. The program has never been used. Its existence is the policy.
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Fiscal dominance is stable under three conditions: low inflation, sufficient growth, and sustained market confidence. None is guaranteed.
If inflation stays above two percent, the ECB must choose between raising rates and triggering debt crises across its largest economies, or tolerating inflation and destroying its credibility. Either damages the institution.
If growth stays low, debt ratios rise even at low interest rates. Italy’s economy grew just 0.7 percent in 2024, and growth is projected to moderate further to 0.5 percent in 2025. At that pace, even a modest rise in borrowing costs outpaces the economy’s capacity to grow its way out. International Monetary Fund
If markets lose confidence, yields rise faster than the ECB can respond. The OMT and TPI work because markets believe they will. If that belief is tested simultaneously across Italy, Spain, and France — several trillion euros in outstanding debt — the credibility of unlimited intervention collapses. The ECB can plausibly rescue Italy. Three major economies at once is a different claim.
THE VERDICT
The ECB does not freely set interest rates. It sets the highest rate that Rome, Madrid, and Paris can service without triggering a crisis, and calls the result monetary policy. Italy overtaking Greece is not a headline. It is a data point in a longer series: debt ratios that compound quietly, privatization targets that are missed, primary surpluses that are real but insufficient. Fiscal dominance is not a governance failure — it is the structural consequence of building a monetary union without a fiscal one, then allowing debt ratios to accumulate for two decades while the institution nominally responsible for price stability became the union’s financial backstop by default. The arrangement holds until it is tested. The question is not whether that test is coming. It is what breaks first when it arrives.