Global Bond Selloff Pushes 30-Year Treasury Yield to Highest Since 2004

What happened

A worldwide bond selloff pushed the yield on 30-year US Treasuries to 5.46% on Thursday, the highest level since 2004, as fixed income markets across four continents repriced for higher-for-longer interest rates. The 10-year Treasury yield climbed to 5.14%, a 19-year high.

The move was not confined to the US. Germany's 10-year Bund yield briefly topped 3.6%, its highest in 17 years. Japan's 10-year yield hit its highest level since 1996. The average yield across Bloomberg's Global Aggregate Treasuries index rose to 3.99% on Wednesday, within a fraction of the 4% mark last seen in 2007.

Three forces are driving the repricing:

• Energy costs. Oil prices climbed after the Iran conflict disrupted Middle East supply, pushing inflation expectations higher.
• Resilient growth. US nominal GDP growth ran near 8% in the second quarter, giving the Federal Reserve less reason to ease.
• Fiscal strain. Heavy government deficits, including AI-related infrastructure spending, are forcing investors to demand higher compensation for holding long-dated debt.

"You're seeing a repricing of several things: US economic growth has remained resilient, and that seems to be causing a harder look at the fiscal picture," said Zachary Griffiths, a strategist at CreditSights.

Why it matters

Higher long-term yields raise the discount rate applied to every future cash flow, from equity valuations to real estate. US 30-year mortgage rates have climbed to 7%, roughly a full percentage point above pre-war levels, a direct hit to housing affordability and refinancing activity. Bond funds and fixed income allocations inside diversified portfolios have lost value as prices moved inversely to yields.

For investors holding a mix of listed equities, bonds and private assets, the selloff is a reminder that fixed income is not a passive holding. Duration risk moves portfolio value even without a change in credit quality.

Context and what to watch next

The selloff has not yet triggered the kind of stress that would force central bank intervention. Corporate earnings remain strong, and equity markets have absorbed the bond move without a disorderly decline, though the S&P 500 has pulled back from its recent record high and the Dow has fallen for three consecutive sessions.

The next test comes from central bank meetings. The European Central Bank raised rates on 10 September, and the Federal Reserve lifted its target range to 3.75%-4.00% on 16 September, both citing persistent inflation. If yields keep climbing toward or past 4% on the global aggregate index, pressure will build on both banks to signal where the tightening cycle ends.

Sweden sits at the edge of this trend. Riksbanken held its policy rate at 1.75% this week even as global yields rose, but Swedish mortgage and corporate bonds price off international benchmarks. If global rates keep climbing, Swedish borrowing costs can rise even without a Riksbanken hike. Investors tracking a portfolio that spans equities, bonds and property exposure get an early read on that spillover by watching yield levels directly, rather than waiting for the next rate decision.