Here's how the private sector can save U.S. Treasurys, UOB says

UOB warns that rising U.S. fiscal stress could push Treasury yields higher as federal debt held by the public is projected to reach 120.21% of GDP by 2036. The bank cites about $25 billion in Iran war costs, potential gaps from proposed 10% global tariffs, and a need for the private sector to absorb more Treasury supply as foreign demand softens. U.S. corporate bond issuance is also adding supply, with U.S. USD-denominated issuance up 43% year-on-year to $956 billion by end-May.

Analysis

The market is shifting from a duration problem to a balance-sheet absorption problem. When marginal Treasury demand migrates from captive foreign official buyers to price-sensitive private balance sheets, yields become more vulnerable to supply shocks and less anchored by macro growth data; that typically steepens the curve even if the front end is held down by Fed expectations. The second-order effect is that the same fiscal impulse that supports nominal growth also forces higher term premium, which is toxic for long-duration equities and levered credit.

The most underappreciated transmission is crowding out in USD credit. Rising sovereign supply alongside a pickup in corporate issuance means investors are being asked to finance both government and quasi-government duration at once; in practice, that tends to widen spreads first in BBB/BB industrials and then in lower-quality REITs and utilities as portfolio managers de-risk from spread duration. If inflation concern remains sticky, the private sector’s willingness to absorb supply falls just as issuance rises, creating a self-reinforcing move higher in real yields.

The catalyst stack is months, not days: fiscal rhetoric can move tape intraday, but the real stress point is the next 1-3 Treasury refunding cycles and any auction tailing. The main reversal is a decisive disinflation print or a policy surprise that boosts foreign buying appetite, but absent that, every incremental budget revision or tariff-driven revenue gap pushes term premium higher. Tail risk is a disorderly auction regime where weak bid-to-cover forces dealer balance sheets to intermediate more supply, which could quickly leak into mortgage spreads and risk assets.

The contrarian angle is that the market may be treating this as a generic rates story when it is actually a funding-structure story. If foreign demand is structurally softer, the clearing price for Treasuries needs to stay higher for longer than growth or Fed narratives imply, and the beneficiaries are likely not just cash-rich banks but also inflation-protected assets and short-duration credit. That makes the setup more attractive in relative value than outright duration unless the position is explicitly tied to a steepener or higher term-premium view.

Key Decisions for Investors

• Add a 6-12 month 5s30s steepener via TYU/TUZ or payer swaptions on the long end; thesis is rising term premium from supply absorption, with downside if disinflation accelerates and the curve bull-flattens.
• Reduce exposure to long-duration equity proxies: trim XLU and IWM on rallies, or hedge with IEF/TLT puts over the next 1-3 months; best risk/reward if rates back up on any weak auction.
• Overweight TIPS vs nominals: long TIP/VTIP, short IEF in a paired duration-neutral trade; works if fiscal stress keeps breakevens supported while real yields drift higher.
• Short lower-quality IG/BB credit proxies via HYG against a long cash/UST hedge; focus on names with heavy refinancing needs in 2026-27 where spread widening can outpace rate carry.
• If Treasury auctions start tailing, initiate a tactical long-vol rates trade using TLT straddles for 2-4 week windows; catalyst-driven payoff is asymmetric, but size should be small due to theta bleed.