UK and Japan bond yields rise on fiscal spending fears

Long-term government bond yields in the United Kingdom and Japan have risen sharply, with investors in both markets grappling with concerns over expanded fiscal spending by new or assertive political leaders.

Burnham's First Days Rattle Gilt Markets

UK 30-year gilt yields reached a two-month high of 5.7744% on Tuesday, July 21, as markets digested Prime Minister Andy Burnham's early signals that he would seek "any flexibility" within the government's fiscal rules. Burnham took office on July 20, succeeding Keir Starmer as leader of the Labour Party and prime minister.Wikimedia Foundation, Inc.+3

The 10-year gilt yield also climbed to 5.0586%, its highest since May 20. Sterling fell 0.37% against the dollar, according to Reuters ↗ 6.40%, as traders weighed the cost of Burnham's spending ambitions.live.euronext.com

Burnham's appointment of John Healey, a former defence secretary, as finance minister added to the uncertainty. "The vision is Burnham's, and so he will have to figure out how to deliver the cash, which I don't think will be easy because they do want to spend a lot," said David Zahn, head of European fixed income at Franklin Templeton ↗ 4.67%.live.euronext.com

Bloomberg reported that 30-year gilt yields rose as much as eight basis points to 5.73% on Monday as Burnham's remarks about fiscal flexibility spooked investors. Anthony Willis, economist at Columbia Threadneedle Investments, noted that "the ambition to lift UK growth towards 2.5% is understandable, but there is no obvious quick fix," particularly given competing demands from defence and welfare spending.Bloomberg+1

Japan's Takaichi Blueprint Fuels Bond Pressure

Across the Pacific, Japan's 30-year bond yield rose to 3.89% as of July 21, continuing an upward trend that has added 0.80 percentage points over the past year. The climb follows Prime Minister Sanae Takaichi's unveiling of an investment roadmap calling for more than 370 trillion yen ($2.3 trillion) in combined public and private spending across 17 strategic sectors through March 2041, with 101.6 trillion yen earmarked for artificial intelligence and semiconductors.TRADING ECONOMICS+2

Reuters reported that the blueprint lacks a clear explanation of how the government will pay for the spending without worsening Japan's already heavy debt burden. The bond market has been signaling "diminishing confidence that the central bank can contain inflation while the government's spending ambitions further strain the nation's finances," Reuters reported earlier this month.Reuters+1

A Global Pattern

The simultaneous rise in UK and Japanese long-term yields reflects a broader pattern of investor unease over sovereign debt sustainability. Both governments face the challenge of funding ambitious spending plans in an environment of elevated borrowing costs. In the UK, gilt yields have climbed roughly 0.24 percentage points over the past month alone, while Japan's 10-year yield rose to 2.75% on July 22, up 1.15 percentage points from a year ago. Reuters had previously warned that Britain's bond market "may limit what Burnham can do as PM," a dynamic now playing out in real time.TRADING ECONOMICS+2