The deferred bill

There is a magic trick in economics that only the United States has managed to sustain. A country that owes the rest of the world far more than it owns abroad should, in good logic, pay a net rent to its creditors every year. America did the opposite: a net debtor of more than $21 trillion, it nonetheless collected positive net income on its external holdings. Economists gave that anomaly a name, the exorbitant privilege, and for half a century they debated its magic without seeing it weaken. It is weakening now, and the mechanism behind it is jamming. The meal the world served America for free is starting to cost something.

The trick rests on a balance-sheet asymmetry simple to state. The United States holds risky, rewarding assets abroad, equities and direct investment, while the world holds in return safe, low-yielding American assets, Treasuries first. The US net international investment position was minus $21.27 trillion at the end of March 2026, $43.37 trillion of assets against $64.64 trillion of liabilities, a chasm. But the higher return on American assets abroad offset the gap in holdings, so the income balance stayed positive despite the debt. That is what we described in our guide on the balance of payments: the debtor that earns money, a paradox that financed the American deficit for free across two generations.

The mechanism that jams

Two forces are closing the trap. The first is the rise in global rates. As long as the world lent to the United States at near-zero rates, the cost of its liabilities stayed negligible and the return differential ran full. Since rates normalised, every Treasury held by foreigners costs more, and the service of the external debt swells. The second is the accumulation of liabilities itself: by dint of financing current account deficits, the stock of debt held by foreigners has grown to the point where its cost, even at a modest unit yield, ends up weighing heavily. The result is mechanical: the investment income balance, long in surplus, is coming back down towards zero and about to tip into deficit.

That tipping is no small thing. The day the income balance turns negative, the American current account deficit stops being financed for free: the United States will have to pay the world a net rent, for the first time in decades, on top of borrowing to fill its trade deficit. The planet’s most indebted country will become an ordinary debtor again, one that pays to be so.

The dark matter

The most troubling feature is what still keeps the balance afloat. A growing share of the positive net income comes not from a true return differential but from an accounting artefact: the profits US multinationals offshore into tax havens and repatriate as investment income. Economists call that component dark matter, income that inflates the accounts without matching any genuine yield superiority. Yet stripped of these offshored profits, the American income balance is already negative. The exorbitant privilege, in its recent form, thus rests partly on the tax optimisation of the tech giants, not on the magic of the dollar. It is a trompe-l’oeil privilege, propped up by a structure that the slightest reform of international taxation could deflate.

The other reading: the privilege is not dead

Before burying sixty years of American exception, one must grant the thesis its counterpoints, because they are real. The first is that the external position has recently improved: from a trough of nearly minus $26.5 trillion at end-2024, it recovered by about $5 trillion to minus $21.27 trillion. That upturn owes mostly to valuation, the rise in American equities held by foreigners cutting the other way, but it recalls that the figure is not on a linear path to the abyss. The second is that the income balance, even in decline, stays close to balance: a tip into slight deficit is not a crisis, it is a slow, absorbable deterioration. The third is that the dollar remains the reserve currency, and as long as the world wants dollars, the United States can finance its deficit on terms no other debtor would obtain. The structural demand for American debt, which we track in our analysis of the marginal buyer, has not vanished.

But the direction is structural

The counter-reading reassures on the pace, not the direction, and it is the direction that matters. For the two forces gnawing at the privilege, high rates and growing liabilities, are not cyclical but structural, and they reinforce each other. The more the federal debt swells, the more the stock of Treasuries held by foreigners grows; the higher rates stay, the more it costs. The return differential that made the magic is compressing from both sides at once. And when the income balance turns durably negative, the effect becomes cumulative: paying a rent to the world widens the current account deficit, which swells the external debt, which heavies the rent. Yesterday’s virtuous circle, where debt cost nothing, slowly turns into a vicious one.

That is why this erosion, invisible and slow, speaks to the signals we track elsewhere. It is the hidden face of the return of the term premium: if investors demand more to hold American debt, the cost of the liabilities rises and the privilege erodes accordingly. It feeds the same underlying distrust as the debasement trade, that of a sovereign issuing without counting. The exorbitant privilege was the silent subsidy that let America borrow the world’s savings without ever presenting the bill. That bill has not disappeared, it was deferred. It is starting, line by line, to arrive.

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Sources

• Bureau of Economic Analysis, “U.S. International Transactions and Investment Position, 1st Quarter 2026” (net international investment position -$21.27tn, assets $43.37tn, liabilities $64.64tn, recovery from the end-2024 trough)
• Econbrowser, “NIIP and Primary Income: Dark Matter vs. Exorbitant Privilege” (income balance coming down to zero, already negative excluding offshored profits)
• Council on Foreign Relations, “The U.S. Income Balance Puzzle” (erosion of the income balance, role of dark matter and profit-shifting)