Quora Answer: Should Japan’s Potential Sale of US Treasuries to Fund Its Currency Market Intervention Concern Us - 01st September 2026

The following is my answer to a Quora question: “Should we be concerned about the potential sale of US Treasuries by Japan to help fund its intervention in the currency markets?”

Washington intervened alongside Tokyo in August 2026, after the yen fell to 163.73 against the dollar, its weakest level in nearly four decades.  The mechanism gave away the fear.  The New York Federal Reserve sold euros, not dollars, to buy yen.  Japan tapped the Federal Reserve’s own Foreign and International Monetary Authorities Repo Facility, created in March 2020, to borrow dollars against its Treasury holdings as collateral, rather than selling those Treasuries on the open market.  Both governments avoided a straightforward Treasury sale.  That avoidance is the tell.  Washington feared the scenario where Japan, the largest foreign holder of US debt at US$1.14 trillion, dumped bonds to fund its own defence.  This would drive American borrowing costs higher at the worst moment.  Borrowing against the asset instead of selling it is not a technicality.  It is the difference between adding fresh supply to a fragile market and avoiding that market altogether.

The Intervention Failed

The yen rallied briefly to 157.96, then drifted back toward where it started.  The reversal was unsurprising.  Both countries avoided a normal Treasury sale.  This is an admission that the market cannot absorb one.  Treasury Secretary Scott Kenneth Homer Bessent confirmed the diagnosis.  Asked why Washington acted, he told CNBC: “People have bad information.  I have asymmetric information.  So, I think the market should think: why would we have joined the Japanese in the intervention at this time?  Do we know something the market does not know?”  That is trading language, not stewardship language.  A Treasury Secretary describing his own information advantage over the market he is meant to steward is not projecting confidence.  He is describing a position, the way a hedge fund manager describes a trade, and the market read it that way once the rally faded within days.

Dollar Privilege is Cracking

The dollar’s share of global reserves fell from above 70 per cent in 2000 to 56.77 per cent by late 2025.  Central banks have bought over 1,000 tonnes of gold every year since 2022, more than double the pre-2022 pace.  China’s own Treasury holdings dropped to US$633.4 billion in June, the lowest since September 2008, redirected instead into German and Swiss bonds.  Washington’s 2022 decision to freeze roughly US$300 billion of Russia’s reserves is the anecdote every central banker weighing this decision now cites privately.  A reserve asset that can be frozen by political decision is not a pure reserve asset.  It is a loan to a government that can cancel repayment on political grounds, and that lesson did not stay confined to Moscow.  Every non-aligned reserve manager absorbed it at once, and gold purchases accelerated the same year the freeze happened, not years later.

US Debt Made This Worse

National debt sits above US$37 trillion.  Net interest costs hit US$963 billion over ten months of fiscal 2026, roughly US$3.18 billion a day.  A 30-year Treasury auction cleared at 5.216 per cent in August, the highest yield on that maturity since 2001, with demand weaker than dealers expected and the stop-out yield pricing above the level dealers had anticipated.  The Treasury Borrowing Advisory Committee has already flagged a US$1.45 trillion funding shortfall for fiscal 2027 to 2028 at current auction sizes.  A government this leveraged has no spare room to absorb a foreign ally’s bond sale gracefully.  This is why it chose euros over its own currency’s core asset to fund the rescue in the first place.  Every additional dollar borrowed to plug that shortfall competes with the market’s remaining appetite for the exact securities this intervention was meant to protect.

Japan’s own central bank raised rates to 1 per cent in June 2026, the highest level since 1995, on a split 7-1 vote.  It then held at 1 per cent in July, an 8-1 decision, even as it forecast core inflation would climb above its 2 per cent target within the year.  Prime Minister Sanae Takaichi has since appointed a new board member widely read as dovish, tilting the committee back toward caution just as the currency needed the opposite signal.

The caution is not pure timidity.  Japan carries a debt-to-GDP ratio near 230 per cent, the highest of any major economy on earth, and every rate increase raises the government’s own debt servicing cost, a policy trap that limits how fast the BOJ can move without triggering a fiscal problem of its own making.  That earns Japan some sympathy.  It does not change the outcome.  The Bank of Japan has managed the symptom slowly enough to need a joint intervention with Washington, and slow enough that the intervention became necessary rather than optional.

Yes, this should concern us.  Not because Japan sold Treasuries.  Because Japan and America both structured an intervention to avoid that sale, revealing a market too fragile to absorb it, propping up a currency whose central bank still will not move fast enough to fix the cause, constrained by a debt load large enough to make the correct policy politically dangerous to deliver.

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Terence Nunis | Executive Chairman, Equinox Zenith | Author, The 1% Playbook: The Billionaire Cheat Code