Study: Europe's $200 Billion U.S. Treasury Leverage Could Add $42 Billion to America's Annual Fiscal Costs
Claire Weston
A Kiel Institute study finds that if European regulators strip U.S. Treasuries of their zero-risk-weight privilege, demand could drop by $200 billion over a decade — adding up to $42 billion a year in U.S. fiscal costs. Europe's regulatory toolkit may be its most underestimated bargaining chip.
What is "zero risk weight," and what happens if it goes away?
Under current rules, European banks hold U.S. Treasuries with no extra capital buffer required — Treasuries are treated as risk-free. This means → buying Treasuries costs banks virtually nothing in capital terms, essentially a free position.
The study's scenario: raise the risk weight from 0% to 20% — the same tier as high-grade corporate bonds or some A-rated sovereigns. In plain terms = for every dollar of Treasuries a bank holds, it must now set aside real capital, raising the cost of ownership and naturally reducing demand.
The authors argue that given current U.S. debt dynamics, correcting this privilege qualifies as "sound prudential policy" even without a geopolitical motive.
A $200 billion demand gap — what does that mean for the U.S.?
The model estimates that after the risk-weight adjustment, European demand for Treasuries would fall by roughly $200 billion over ten years. This means → the U.S. Treasury must find other buyers to fill the gap, and attracting them typically requires higher yields.
Interest-cost transmission: the study estimates the U.S. could face up to $42 billion in additional annual fiscal costs. In plain terms = the extra interest alone rivals a mid-sized federal budget line item.
The critical point: this path requires no one to sell Treasuries on the open market. A regulatory parameter change alone can pressure U.S. borrowing costs.
Why does Europe have this leverage in the first place?
The European economies covered — the eurozone, the U.K., Denmark, Sweden, and Norway — hold at least $9.6 trillion in U.S. assets. The U.S. holds only about $6.4 trillion in assets from these economies. This means → Europe has a net exposure advantage, structurally sitting on the seller's side.
The authors caution, however, that equity assets (like stocks) are less sensitive to regulatory changes than debt assets (like Treasuries) — so the leverage that can actually be "activated" concentrates on the bond side.
This reflects a structural reality: Europe's entanglement with the U.S. financial system runs far deeper than everyday discussion suggests.
Why regulation, not a sell-off?
The study explicitly frames regulatory adjustment — not asset sales — as Europe's core lever. In plain terms = instead of dumping bonds on the market and triggering panic, Europe can quietly tighten the tap and let demand decline gradually.
The operational bar is low: this lever "can be activated through existing regulatory frameworks, without creating new institutions, amending treaties, or coordinating government asset sales" — far less political friction than an open confrontation.
A small-scale precedent already exists: after Trump threatened to seize Greenland earlier this year, Danish pension fund AkademikerPension exited roughly $100 million in U.S. Treasuries, instantly sparking speculation about a broader European sell-off. This reflects how sensitive markets already are to this lever — even a minor move amplifies the signal.
What does this mean for the transatlantic negotiating landscape?
The study's two authors — Greek central bank economist Filippos Petroulakis and University of Bonn professor Farzad Saidi — state plainly that policymakers may "rationally choose to deploy" this regulatory change "at the most critical juncture in diplomatic negotiations." This means → the card's value lies not just in playing it, but in letting the other side know you hold it.
The EU is already assessing its leverage against the U.S. more systematically. According to a Bloomberg report in March, German officials have begun mapping vulnerabilities in U.S. supply chains to identify pressure points.
Whether this regulatory path actually enters the policy agenda will be a key variable in reading the trajectory of transatlantic trade talks — it reshapes not any single deal, but the entire structure of bargaining chips.
Content is for reference only, not financial advice.