Treasury yields slide 4bps to 4.44% as Iran deal reshapes Fed outlook

The 10-year Treasury yield tumbled 4 basis points to 4.441% as a US-Iran diplomatic breakthrough pushed the market's next expected Fed rate hike out to March 2027.

The diplomatic pivot between the US and Iran has upended the bond market's rate-hike calculus, sending the 10-year Treasury yield to 4.441% and pushing the next expected Fed tightening beyond March 2027. President Trump announced on June 11 a pause on military strikes against Iran, pivoting toward diplomatic negotiations that have produced a draft 14-point memorandum of understanding between the two nations, according to reports.

Overnight-indexed swaps shifted dramatically after the announcement, with some contracts beginning to price the next potential rate hike as far out as March 2027. Just days earlier, the market had been bracing for the possibility of near-term tightening after earlier military engagements between the US and Iran in 2026 had pushed Treasury yields significantly higher, with the 30-year yield approaching multi-year highs.

The bond rally swept across the curve. The 10-year yield fell to around 4.46% on June 12 before slipping further to 4.441% by June 15, a sharp reversal from the multi-year highs that had defined much of 2026's bond market. The 30-year yield also retreated from its recent peaks as traders unwound positions built on expectations of a prolonged conflict. The two-year yield, which is more sensitive to Fed policy expectations, also declined as the rate-hike timeline shifted further into the future.

The Strait of Hormuz factor

The diplomatic framework reportedly addresses regional de-escalation, the Strait of Hormuz, and sanctions relief. The narrow waterway handles roughly a fifth of the world's oil supply daily, and military tensions in the region had created a persistent risk premium in crude prices throughout much of 2026. That premium fed directly into inflation readings that kept the Fed on alert.

Crude prices fell on the news of the deal, breaking the inflation chain that had supported the case for further rate hikes. Lower energy costs reduce the pressure on the Fed to act, which made bonds more attractive, sending yields lower and prices higher across the maturity spectrum. The drop in crude also provided a tailwind for equities, with stock index futures advancing more than 1% on the news.

What comes next

The durability of the rally depends on whether the diplomatic breakthrough holds. A 14-point memorandum of understanding is not a signed peace treaty. If talks collapse, the entire trade could unwind — yields had been pushing toward multi-year highs on pessimism before falling to 4.46% on optimism, and a return to military escalation could push yields to new peaks as oil prices spike and inflation expectations ratchet higher.

The last time a major US-Iran diplomatic initiative collapsed was in 2019, when the US withdrew from the nuclear deal. In the months that followed, Brent crude rose more than 20% and the 10-year yield fell as investors fled to safe havens. A similar scenario could unfold if the current talks falter, though the broader macroeconomic backdrop of elevated inflation in 2026 differs markedly from the pre-pandemic environment.

Swaps pricing the next hike out to March 2027 reflects genuine relief, but the Fed's actual decisions will depend on realized inflation data in the months ahead. The central bank has not changed its stance, and the next policy meeting will offer the first formal test of whether the diplomatic shift has altered the Fed's own outlook. For now, the bond market is betting that peace, not policy, will do the Fed's work for it.

This article is for informational purposes only and does not constitute investment advice.