Treasuries: Stagflation Fears Steepen the Curve
Key Takeaways
- The 10-year Treasury yield surged 24bp to 4.21% in two weeks as stagflation fears intensify, driven by the Iran conflict and sticky 3.1% core PCE inflation.
- Bear steepening of the yield curve — with the 30-year pushing toward 5% — signals investors are demanding higher premiums for long-term inflation risk, not pricing in recovery.
- Short-duration Treasuries and TIPS offer the best risk-adjusted positioning, while long-dated bonds face significant downside if inflation remains above the Fed's 2% target.
- The Fed is trapped between cutting rates to support growth and tolerating inflation well above target, making 'managed stagflation' the likely path of least resistance.
The 10-year Treasury yield hit 4.21% on March 11 — up 24 basis points in just two weeks — while the 30-year bond surged to 4.86%. This isn't a garden-variety rate move. It's the bond market pricing in something the Fed doesn't want to say out loud: stagflation is no longer a tail risk.
The yield curve is bear-steepening. Long-dated Treasuries are selling off faster than short-dated paper, pushing the 10Y-2Y spread to 51 basis points. That spread has actually compressed from 59bp two weeks ago, but the direction of travel matters less than the driver: rising inflation expectations paired with deteriorating growth signals. When the curve steepens because long yields are rising into economic weakness, bond investors are demanding a premium for uncertainty — not pricing in recovery.
With the Fed funds rate at 3.64% after five cuts since September 2025, the central bank has already used significant ammunition. Core PCE running at 3.1% in January leaves the Fed trapped between a slowing economy and inflation that refuses to cooperate. The Iran conflict and fresh trade tariffs have poured fuel on energy costs, making the inflation outlook even uglier.
Yield Landscape: Every Maturity Is Repricing Higher
The move across the Treasury curve has been swift and broad. The 2-year yield climbed from 3.38% on February 27 to 3.64% on March 11 — a 26 basis-point jump. The 10-year rose from 3.97% to 4.21%. The 30-year, most sensitive to long-run inflation expectations, went from 4.64% to 4.86%.
This is bear steepening with a structural twist. In a typical rate-hiking cycle, the front end leads the selloff. Here, the front end is anchored by a Fed that's cutting, while the long end reprices for a world where inflation stays elevated for years rather than quarters.
Treasury Yield Curve — Late Feb vs Mid-March 2026
The 10Y-2Y spread at 51bp is still positive — the curve un-inverted in late 2025 after the Fed began cutting. But the quality of that steepening matters. A bull steepening (short rates falling faster) signals relief. A bear steepening (long rates rising faster) signals fear. We're in the latter camp.
Treasury Bills average 3.72% as of February 28, per Treasury.gov data. Notes average 3.19% and Bonds 3.377%. The weighted average rate on all interest-bearing federal debt stands at 3.32% — a number that rises with every new issuance at today's elevated yields.
The Fed's Stagflation Trap
The Federal Reserve cut rates five times between September 2025 and February 2026, bringing the fed funds rate from 4.33% to 3.64%. Those cuts made sense when disinflation was the base case. That base case is now under serious strain.
Core PCE hit 3.1% in January — more than a full percentage point above the Fed's 2% target. Services inflation remains sticky. Energy costs are surging on the back of the Iran military conflict and supply disruptions. New trade tariffs on imports from the EU, Canada, and the UK add another inflationary layer.
The Fed faces a classic lose-lose. Cut further and risk pouring gasoline on inflation that's already running hot. Hold steady and watch economic growth deteriorate under the weight of elevated rates, geopolitical uncertainty, and consumer fatigue. Some strategists are now floating the idea of "managed stagflation" — the Fed quietly tolerating above-target inflation to avoid triggering a full recession.
That framework is bad news for bond holders. If the Fed won't fight inflation aggressively, the bond market will demand higher term premiums to compensate. The 30-year at 4.86% already reflects this shift. A move toward 5% is entirely plausible if the next CPI print surprises to the upside.
CPI rose from 326.588 in January to 327.460 in February — a 0.27% monthly increase that, annualised, runs well above the Fed's comfort zone.
Fiscal Pressure: The Issuance Wall
The supply side of the Treasury market adds another layer of concern. The US government continues to run large deficits, requiring massive issuance of new debt at current yields. Every new auction reprices the federal government's borrowing cost higher.
The average interest rate on total marketable debt hit 3.355% in February, up from 3.32% on the broader interest-bearing book. Treasury Bills — the largest category by volume — carry an average coupon of 3.72%. As older, lower-coupon debt matures and rolls into new issuance at current rates, the government's interest expense accelerates.
This creates a feedback loop. Higher deficits require more issuance. More issuance at higher rates increases the deficit further through rising interest payments. Bond investors watching this dynamic demand even higher yields as compensation — a fiscal doom loop in slow motion.
The quarterly refunding schedule has already shifted toward more long-dated issuance to lock in funding, but that decision front-loads the pain in the very maturities where inflation fears are most acute. The 30-year bond's 22bp rise in two weeks partly reflects supply anxiety layered on top of stagflation pricing.
Geopolitics and Oil: The Inflation Accelerant
The Iran conflict has fundamentally changed the inflation calculus. Energy prices are spiking on supply disruption fears, and the effects cascade through every sector of the economy — from transport costs to food prices to manufacturing inputs.
Trump's decision to ease sanctions on Russian oil provides some offset on the supply side, but markets remain nervous. The combination of Middle East instability and an escalating trade war with traditional allies creates an inflation cocktail that monetary policy alone cannot fix.
10-Year Treasury Yield — March 2026
The yield trajectory tells the story: a steady grind higher with periodic acceleration on geopolitical headlines. The March 11 jump to 4.21% coincided with fresh Iran-related tensions and tariff escalation news. Bond traders are pricing in not just today's inflation but the risk that supply-side shocks keep inflation elevated well into 2027.
This matters for the yield curve specifically because supply-side inflation is the one type the Fed can't easily address. Demand-pull inflation responds to rate hikes. Cost-push inflation from oil shocks and tariffs persists regardless of monetary policy — and rate hikes to fight it actively damage growth, deepening the stagflation trap.
Investor Outlook: Positioning for Persistent Inflation
Treasury holders should prepare for continued volatility and a bias toward higher long-end yields. The fundamental setup — sticky inflation, geopolitical supply shocks, fiscal expansion, and a constrained Fed — argues against expecting a meaningful rally in duration.
Short-duration Treasuries (2-year and under) offer the best risk-adjusted value. The 2-year at 3.64% sits near the fed funds rate, meaning investors receive similar income with far less interest-rate risk. If the Fed is forced to pause or even reverse course, the front end is relatively protected.
The 30-year at 4.86% looks enticing on yield alone, but the risk-reward is poor. If stagflation deepens, the long bond could easily breach 5%. A 50bp move in the 30-year translates to roughly 8-10% price losses on existing holdings — a devastating outcome when you're earning less than 5% annually.
TIPS deserve attention. With an average coupon of 0.99% plus inflation adjustment, they provide direct protection against the scenario the market is now pricing. If CPI continues its upward trajectory from the current 327.46 index level, TIPS will outperform nominal Treasuries significantly.
The broader message from the bond market is unambiguous: the era of declining yields is over. The bear steepening we're witnessing isn't a temporary dislocation — it's the market recalibrating for a world where inflation is structural, not cyclical.
Conclusion
The Treasury market is sending a clear signal that investors ignore at their peril. A 24bp surge in the 10-year yield over two weeks, bear steepening across the curve, and the 30-year pushing toward 5% all point to a fundamental repricing of inflation risk. The Fed's rate cuts provided temporary relief, but with core PCE at 3.1% and energy costs spiking from the Iran conflict, those cuts now look premature.
Stay short on duration, overweight TIPS, and treat any rally in long-dated Treasuries as a selling opportunity. The stagflation scenario is no longer hypothetical — it's unfolding in real time across every maturity on the curve.
Frequently Asked Questions
Sources & References
fred.stlouisfed.org
fred.stlouisfed.org
fred.stlouisfed.org
fred.stlouisfed.org
fred.stlouisfed.org
fiscaldata.treasury.gov
Disclaimer: This content is for informational purposes only and does not constitute financial advice. Consult qualified professionals before making investment decisions.