The yield on the 30-year U.S. Treasury rose above 5.1% on Thursday, marking its highest level since October 2023, after the House moved forward with President Trump’s proposed $4 trillion tax and spending package.
Investors have grown increasingly wary about the expanding federal deficit. Concerns intensified after Moody’s downgraded the U.S. credit rating and a recent 20-year Treasury auction showed weaker-than-expected demand.
Market participants worry the proposed bill could lead to a significant increase in government borrowing. The prospect of additional supply of long-term Treasury securities is pushing yields higher and contributing to broader skepticism about U.S. assets among fixed-income investors.
Higher long-term yields can raise borrowing costs across the economy, affecting mortgage rates, corporate funding, and government interest expenses. Analysts say the combination of fiscal policy changes and signs of softer demand at auctions creates an environment where investors demand higher compensation for holding long-dated debt.
While monetary policy decisions and inflation expectations also influence Treasury yields, the fiscal outlook plays a central role in shaping long-term borrowing costs. Market participants will be watching upcoming auctions, budget projections, and legislative developments closely to gauge whether the recent rise in yields is transitory or the start of a more sustained trend.
For now, the move above 5.1% highlights how fiscal policy debates and credit-quality concerns can quickly alter market sentiment, prompting reassessment of risk and valuations across fixed-income markets.