Bond market strife: why yields are rising and what it means for other investments

Equity markets are coming under renewed pressure as rising government bond yields spook investors and reignite long-standing concerns over global debt sustainability.

The sell-off has been particularly sharp in growth and rate-sensitive sectors, with analysts warning that this may be more than just a temporary wobble.

As bond yields move higher, stock prices often fall, and that classic market reaction was playing out on Wednesday and Thursday.

So while rising bond yields may sound like a dry financial concept, they have real-world consequences for portfolios, as borrowing becomes more expensive and future earnings are worth less in today’s terms – both of which are negative for stocks, particularly in sectors like tech and real estate.

At the same time, stronger yields on government debt may tempt investors to rotate out of equities and into bonds, further pressuring share prices.

Analysts and strategists noted that bond yields have been moving higher for most of 2025, but are getting attention now, as Donald Trump tries to push through its budget plans, new UK public borrowing figures were published, and Japan looked for new sources of demand for its bonds.

UBS chief investment officer Mark Haefele said: “Concerns about the US deficit and rising debt levels have contributed to the recent rise in bond yields.”

Debt, deficits and discomfort

The latest moves in the bond market reflect growing investor anxiety about government borrowing. In the US and the UK, the fiscal position is in the spotlight.

Stateside, this reflects the passage of Trump’s 'one big beautiful bill', legislation that includes $1.5 trillion of tax cuts that made it through an overnight session in Congress on Thursday morning, and a series of disappointing bond auctions.

"Trouble has been brewing in the bond market for weeks and now it's spread to the stock market,” said Saxo UK strategist Neil Wilson.

Stocks are falling as "investors realised this is not a drill" and "will break the equity market to save the bond market".

Jim Reid, macro strategist at Deutsche Bank, cited concerns about debt sustainability in many developed nations, as well as weak demand at recent auctions in the US and Japan.

He also pointed to rising UK borrowing levels, with April figures showing the fourth-highest deficit for the month since records began in 1993.

Kathleen Brooks at XTB noted that countries with high and rising deficits are coming under pressure.

"European yields have also sold off but to a lesser extent, suggesting that they are deemed a safer credit risk compared to other developed markets right now," she said.

The return of the bond vigilantes

As bond yields climb, so too does the pressure on policymakers. Investors are demanding higher returns to fund expanding deficits, and that has consequences for all corners of the financial system.

"Investors are pushing back against the tax and spending plans by the US administration – the bond vigilantes are only ever sleeping lightly,” Wilson noted, warning that the "bond market is starting to flex its intimidating muscle... this is not just a US problem."

Deutsche Bank’s Reid added that the issue of debt sustainability has been bubbling beneath the surface for some time.

"Sensible people have been worried about debt sustainability for years. Indeed, if you'd have told anyone 10-20 years ago that the US could comfortably fund 7% mid-cycle deficits in recent years, then most would have been incredulous at the prospect.

"So we could have sustainability fears for years to come before an inevitable accident or event happens. However it's fair to say that events in 2025 have brought forward any day of reckoning."

Wednesday saw the 30-year US Treasury yield close above 5% for the first time since October 2023, at 5.09% only a couple of basis points away from its highest level since 2007.

Breaking through the 5.00% threshold "is a red flag", said City Index market analyst Fawad Razaqzada.

On Thursday morning in the US, the 30-year yield spiked to 5.136%, which he noted was not far from the multi-year high of 5.178% set in October 2023.

Japan's seismic activity

While red flags seen in the US bond market, "the real story lies across the Pacific", said Razaqzada, as Japanese yields have hit a record high.

A rate of 3.197% "may not seem much by Western standards, but for Japan, a land long ruled by zero rates and easy money, it’s a seismic jolt", he said.

"This sharp move could spell trouble for the famed yen-funded carry trade, where investors borrow cheaply in yen to invest in higher-yielding assets elsewhere.

"As the Bank of Japan inches towards normalising policy and inflation running hot, the rug may be pulled out from under this strategy – just as we saw last year", when the yen slumped to a 34-year low. 

Safe havens and real-world effects

While stocks struggle, other asset classes seen as safer havens benefit from the uncertainty.

Gold rallied to $3,323, just shy of last month’s record high, while bitcoin has surged to a new all-time high just above $111,700.

The US dollar, meanwhile, was weaker on Wednesday but levelled off on Thursday.

Outside of investors, will anyone notice? Definitely, yes. 

Market analyst Kenny Polcari at Slatestone Wealth noted that an effect on the real economy will be seen in mortgages.

He says this "should mean that anyone looking to sell their house may want to rethink their price expectations... rising rates will raise the cost of housing unless the price of the house declines, something it has to do after the bubble the Fed and the Treasury created over the past 16 years."

Zillow recently reported that monthly home values have dropped in 27 of the 50 states, with an average drop of around 6%.

Higher borrowing costs for loans and credit cards can hit consumer spending and confidence, while also hitting businesses and hence jobs.