The Global/US Bond Selloff: Why Prices Are Falling, and Yields Are Rising

 

·       The inflation trend shows the CPI may soon blow past 4.0-4.5% if the SOH deadlock continues, pushing the US 10Y bond yield above 5.0%.

·       In the early US session, May 20, UST stocks and gold surge, while oil and bond yields slip on reports of an imminent Iran deal.

As of mid-May 2026, global bond markets are experiencing a pronounced selloff. US Treasury prices have declined sharply, pushing yields higher, with similar movements rippling through major sovereign debt markets in Europe, Japan, and beyond. The 10-year US Treasury (UST) yield has climbed to almost 4.67% in the early EU session, May 20, 2026, hovering around a 16-month high, while the 10YUST has made a similar multi-month low around 108.63. The US30Y yield made a high around 5.17%─levels not seen in nearly two decades for the long end; the 30YUST price made a low around 109.63. The US10Y yield has jumped from around +3.90% in late February, before the Iran war started, to around +4.67%.

The primary trigger of higher bond yields since early March '26 is Trump’s Iran war, the double blockade of the Strait of Hormuz (SOH), a vital chokepoint of energy (oil & gas) and commodities, including fertilizers. The resultant surge in oil & gas and fertilizer prices has made a synchronized ripple effect globally, and inflation is surging on both sides of the Atlantic as well as the Pacific. The US total CPI inflation scaled to +3.8% in May amid soaring gas/fuel prices. The global crude oil prices soared from around $65 to $118 soon after the Iran war broke out and are now hovering around $105 in mid-May amid hopes & hype of an imminent peace deal between Iran and the US with the reopening of the SOH.

The sudden reversal of the US 10Y bond yield comes after periods of relative price stability in late 2025 and expectations of monetary easing earlier in the year. Despite Trump's trade/tariff war tantrum, US inflation was not boosted materially, as the effective Trump tariff was around 8%, and that too may have been shared equally between US importers, consumers, and global exporters. This, along with some additional strength in USD and tariff inflation, was moderately stable even after some one-time price rises.

But in early 2026, Trump’s Iran war fun, higher energy prices, hotter inflation, and less dovish comments by the incoming Fed Chair Warsh (replacing Powell)─the market is now no longer expecting a 25 bps rate cut in H2CY26. In contrast, the market is now beginning to expect a 25 bps rate hike in H2CY26. Thus, the expectation of higher inflation and higher interest rates/tighter monetary policy is boosting US and global bond yields.

Primary Drivers of Bond Yields (Especially US Treasury Yields)

Bond prices and yields (coupon rate/market prices of bonds) move inversely.

Bond yields, particularly longer-term ones like the 10Y UST, are determined by the market's collective expectations and required compensation for lending money. They reflect the price investors demand to hold bonds given future economic and policy conditions/expectations. Yields rise when bond prices fall (and vice versa).

Core Formula for Understanding Yields

Nominal Yield ≈ Expected Inflation + Real Yield (Growth/Real Rate Expectations) + Term/Risk Premium

In simple language, when inflation rises rapidly or is expected to rise meaningfully, investors generally sell bonds issued at relatively lower coupon rates and look for fresh bonds at higher coupon rates for a positive real return.

Primary drivers, ranked roughly by importance:

v Inflation Expectations

·       Higher expected inflation → higher yields.

·       Investors demand compensation for the erosion of purchasing power from fixed coupon payments.

·       Measured via breakeven inflation (nominal yield minus TIPS real yield).

·       Current context (mid-May 2026): The Iran war and Strait of Hormuz disruptions have pushed oil prices sharply higher, driving CPI higher (April ~3.8%). This has lifted breakeven and overall yields.

v Stagflation impact: High inflation + weak growth is particularly bad for bonds—yields rise due to inflation while growth concerns limit how much central banks can fight it through loose monetary policies (rate cuts, QEs).

v Monetary Policy & Real Interest Rate Expectations

·       Central banks (especially the Fed) heavily influence the short end of the curve and set expectations for future policy.

·       Rate hike expectations or "higher for longer" yields generally rise.

·       Rate cut expectations (lower for longer): Yields generally fall.

·       Real yields (TIPS yields) reflect the market’s view of the neutral real rate (r-star), economic strength, and policy tightness.

·       Current: Real 10-year TIPS yields have risen to ~2.07–2.16% (above long-term average of ~1%), signaling tighter policy expectations due to inflation.

v Economic Growth Conditions

·       Strong growth: Higher yields (stronger economy → higher neutral rates + potential QTs + more borrowing demand).

·       Recession fears: Lower yields (flight to safety/lower borrowing demand + expected rate cuts/potential QEs)

·       In the current environment, the oil shock creates stagflationary risks (high inflation + growth slowdown from energy costs), which is a challenging mix that generally pushes yields higher on the inflation side.

v Fiscal Policy & Government Debt Supply

·       Large budget deficits require massive bond issuance by the government and a higher coupon rate.

·       Heavy supply can push yields higher unless demand keeps up.

·       Concerns over long-term debt sustainability increase the term premium (extra yield demanded for holding long-term bonds amid uncertainty). This has been a persistent upward pressure on US yields for years.

v Other Technical & Global Factors

·       Foreign demand for US Treasuries (e.g., from central banks).

·       Quantitative tightening (QT) vs. easing (QE).

·       Safe-haven flows can temporarily lower yields during geopolitical crises.

·       Supply/demand technicals in the Treasury market.

Current May 2026 Context

The ongoing Iran conflict and energy shock represent a supply-driven inflation shock layered on existing fiscal pressures. This has caused:

·       Nominal 10-year yield is ~4.6%.

·       Real TIPS yield ~2.1%

·       Break-even ~2.5%

Both real rates and inflation expectations have moved higher, driving the bond selloff. Inflation expectations and monetary policy responses are the dominant short-to-medium-term drivers, while fiscal policy and structural growth influence the longer-term trend. In uncertain times like now (geopolitics + high deficits), the term premium can also rise sharply, amplifying yield moves.

Inflation Expectations and the Role of TIPS

Inflation is historically the most powerful driver of bond yields. When investors expect higher CPI, they demand higher nominal yields to preserve real returns. US Treasury Inflation-Protected Securities (TIPS) provide a direct window into these dynamics. TIPS principal adjusts with CPI, so their yields represent real yields—returns above inflation. The spread between nominal Treasury yields and TIPS yields is the breakeven inflation rate, reflecting the market-implied average CPI expectation. Historically, the 10-year real yield (adjusted actual CPI inflation) has averaged around 1.0% over long periods, serving as a benchmark for a modestly positive real return. In stable times, nominal 10-year yields have often hovered near expected average CPI inflation plus approximately 1.0% real component (plus risk premiums).

In the current crisis, real TIPS yields have risen to elevated levels (~2.1%), signaling expectations of tighter policy, while breakevens have also increased. This dual move explains much of the nominal yield surge. TIPS have offered relative protection compared to nominal bonds but have still faced price pressure from rising real rates.

Monetary Policy Expectations

Central banks face a difficult trade-off. The Federal Reserve, ECB, and others had been positioned for potential rate cuts earlier in 2026. The energy shock has shifted pricing toward fewer cuts—or even pauses/hikes if inflation reaccelerates. Higher real yields reflect stronger policy expectations and a higher perceived neutral real rate (r-star). Markets are pricing in a “higher for longer” scenario, which directly elevates bond yields across the curve.

Fiscal Policy and Debt Supply Pressures

Structural fiscal challenges compound the cyclical pressures. The US federal debt exceeds $38 trillion, with large ongoing deficits requiring substantial Treasury issuance. Heavy supply can overwhelm demand unless yields rise to attract buyers. Debt sustainability concerns further elevate the term premium. Similar dynamics exist in other major economies, notably Japan, where fiscal debates and yield curve control (YCC) adjustments have contributed to JGB yield spikes.

Economic Conditions: Stagflation Risks and Growth Outlook

The current environment carries classic stagflation characteristics: rising inflation coupled with risks to growth from higher energy costs. Stagflation is particularly challenging for bonds because inflation pushes yields up while weak growth limits central bank support. Stronger-than-expected growth in some sectors can also support higher yields by raising neutral rate expectations. Conversely, deepening recession fears could eventually cap yield rises through safe-haven flows and anticipated easing. As of now, the inflation channel dominates.

Global Spillovers and Interconnected Markets

The bond selloff is global. Higher US yields strengthen the dollar, increasing pressure on emerging markets. Reduced foreign demand for Treasuries from some central banks adds technical headwinds. Synchronized inflation risks across regions limit diversification benefits in global bond portfolios.

Historical Context and Comparisons

The current episode echoes aspects of the 1970s oil shocks, when supply-driven inflation and geopolitical tensions drove yields significantly higher. However, today’s starting point features much higher public debt levels and more integrated global financial markets. The post-Global Financial Crisis (GFC-2008) and pandemic eras saw suppressed real yields due to aggressive quantitative easing (QE). The reversal toward normalization—accelerated by current events—marks a regime shift toward higher yield environments.

Overall Implications of Lingering Higher Bond Yields for the US Economy (Mid-2026 Context)

Higher Borrowing Costs across the Economy—Rate-sensitive sectors may face headwinds.

·       Mortgages and Housing: 30-year mortgage rates have climbed toward or above 7%. This reduces housing affordability, cools home sales and prices, and slows new construction. Housing is a major driver of consumer wealth and related spending (furniture, appliances, etc.). Historically, whenever US mortgage rates go above 5% for a few quarters, a financial crisis generally happens.

·       Consumer Debt: Auto loans, credit cards, and personal loans become more expensive, restraining consumption—the largest component of US GDP.

·       Corporate Borrowing: Higher corporate bond yields increase the cost of debt for businesses. This can delay or reduce capital expenditures (CAPEX), hiring, and expansion, especially for smaller firms.

Impact on Government Finances and Fiscal Sustainability

·       Rising Interest Payments: Federal net interest costs are already ballooning and could add trillions to the debt over the next decade if yields remain elevated. Interest is now one of the largest budget items, crowding out spending on infrastructure, defense, healthcare, or tax relief. The US is now paying well over $1 trillion in interest on public debt of almost $45 trillion (federal + states). The US is now paying almost 20% of its revenue as interest on public debt. (18.5% for the federal government for DFY25) against 14% for the last few years and below 10% pre-COVID on average. This is much higher than China (~7%) or the EU (~6%).

·       Debt Dynamics: With public debt exceeding 100% of GDP and large ongoing deficits, higher yields exacerbate sustainability concerns. This can create a feedback loop: more debt issuance → potential further rise in term premium → even higher yields.

·       Crowding Out: Increased government borrowing competes with private sector demand for capital, potentially raising rates further and reducing productive private investment.

Growth and Investment Headwinds

Higher bond yields generally slow economic activity by:

·       Reducing business investment (especially long-term projects like factories or AI infrastructure).

·       Discouraging stock valuations (higher discount rates, lower present value of future earnings), which can weigh on equity markets, consumer confidence, and wealth effects.

·       Tightening financial conditions overall, even if the Fed cuts short-term rates.

In the current stagflationary-leaning environment (higher inflation from energy costs + growth risks from the oil shock), this mix is particularly challenging. Growth may moderate while inflation remains sticky, limiting the Fed’s ability to ease aggressively.

Sectoral and Regional Effects

·       Negative: Rate-sensitive sectors like real estate, utilities, and highly leveraged companies suffer most.

·       Mixed/Positive: Banks and financials may benefit from wider net interest margins (if deposit costs lag). Exporters could gain from a stronger US dollar driven by higher yields.

·       Regional: States and municipalities with high debt or pension obligations face higher borrowing costs for infrastructure and services.

Inflation and Policy Dilemma (Stagflation Risks)

Lingering high yields signal persistent inflation concerns, which can become self-reinforcing if businesses and households build in higher price expectations.

The Fed faces a classic dilemma:

·       Hiking or holding rates to fight inflation risks a deeper growth slowdown.

·       Cutting too soon risks entrenching inflation.

This echoes 1970s dynamics, though today’s economy has more buffers (e.g., energy production, AI-driven productivity). Prolonged higher yields could increase recession risks if they severely cramp the demand of the economy.

Positive Aspects and Offsetting Factors

·       Income for Savers/Investors: Retirees and conservative portfolios benefit from higher yields on new bonds and deposits.

·       Capital Allocation: Higher rates can encourage more efficient investment and discourage speculative bubbles.

·       Attract Foreign Capital: Elevated US yields can draw foreign investment, supporting the dollar and financing deficits (though recent foreign selling has been noted).

Near/Longer-Term Outlook

The US 10Y real interest rate is now hovering around 1.6% (average bond yield - average CPI). History shows that whenever this goes to around 2.5-3.5%, a financial crisis occurs inevitably. The US CPI inflation may soar to around 4.5% by the next few months if the Iran and the SOH deadlock continues. In that scenario, the US 10Y real interest rates may scale around 2.5%, the red line for the next financial crisis. Even if the SOH deadlock resolves today, it may take another 6 months for the overall normalization of the oil & gas market, and in that scenario, oil may not flip much below $80. The US GDP may be affected by 0.3-0.5% due to supply & demand shock, reduced private & public CAPEX, and higher borrowing costs. But the US economy has so far shown resilience, with solid private demand and productivity gains (partly from AI) ─ providing some cushion.

The technical chart shows the US 10Y bond yield may soon scale 5.0%, while the CPI may blow past 4.0% levels in the coming days.