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May 18, 2026
Analyzed by GPT OSS 120B

Bond Market Rout Deepens Amid Rising Inflation Fears from Iran Conflict

AI Summary
The bond market sell‑off intensified as inflation worries tied to the Iran war pushed sovereign yields to multi‑year highs, raising borrowing costs worldwide. Benchmark US Treasury yields hit 4.6310%, Japanese 30‑year bonds reached a record 4.200%, and UK gilts surged, prompting expectations of further central‑bank rate hikes.

Bond market rout deepens as inflation fears linked to the Iran war push sovereign yields to multi‑year highs, raising borrowing costs from Tokyo to Washington.

Escalating Bond Sell‑Off Fueled by Iran‑Related Inflation Risks

The market continues to punish governments after last week’s sell‑off. With the Strait of Hormuz largely closed, analysts warn of prolonged oil‑and‑gas shortages that could keep energy prices elevated, feeding inflation expectations.

Sovereign Yield Spikes Reach Multi‑Year Highs

  • Benchmark 10‑year U.S. Treasury yield: 4.6310% – highest since Feb 2025.
  • 30‑year Japanese government bond yield: 4.200% – record high.
  • 10‑year Japanese yield: 2.800% – highest since Oct 1996.
  • UK 30‑year gilt yield hit its highest level since 1998.

Rising Borrowing Costs Pressure Central Banks and Fiscal Policies

ING analysts note that even a swift end to the conflict would not immediately lower energy prices, leaving central banks with little room to cut rates. The outlook points to possible rate hikes from the Bank of England and the European Central Bank in June and delays any Federal Reserve cut until at least December.

In the UK, the bond market stress adds to political uncertainty, with the Labour leadership battle potentially prompting higher spending and further debt issuance.

Future Outlook: Further Rate Hikes and Market Volatility

Investors should expect continued volatility as the G7 finance ministers convene in Paris and the IMF prepares its Article IV report on the UK. Persistent energy supply concerns could keep inflation expectations elevated, prompting more aggressive monetary tightening worldwide.

Key Calendar Items

  • Today: G7 finance ministers meet in Paris.
  • 10 am BST: IMF presents Article IV report on the United Kingdom.