UK homeowners are facing the prospect of higher mortgage costs as global bond market turmoil drives up swap rates. These rates, which lenders use to price fixed-term mortgage products, reached a three-year high this week, with the five-year swap rate climbing above 4.52% on Wednesday—the highest level recorded since October 2023.
The current market instability is largely fueled by a surge in oil prices, which has heightened concerns regarding inflation. As investors sell off bonds, yields have risen, with UK government debt—or gilts—experiencing particularly sharp movements compared to international peers. On Wednesday, the yield on 10-year UK government debt reached its highest point since 2008 for the second consecutive day before easing slightly as Brent crude prices dipped 0.6% to $95 a barrel on Thursday.
Russ Mould, investment director at AJ Bell, noted that the upward trend in bond yields directly impacts consumer borrowing. “Credit card, mortgage and auto loan interest rates will rise if bond yields rise, as the lenders seek to preserve loan book margins and manage their risk,” Mould explained.
In response to the volatile market conditions, the new prime minister used his first appearance at prime minister’s questions on Wednesday to reassure investors, pledging that upcoming autumn budget decisions would be “grounded in fiscal responsibility.” These efforts to stabilize the market come as the government faces pressure to manage the cost of living, a task complicated by the broader economic environment where government bonds must also compete with a surge of corporate debt issuance from technology firms funding AI infrastructure.
Despite the broader market shifts, data from Moneyfacts indicates that fixed-year mortgage rates remained stable as of Thursday. Currently, the average two-year fixed deal stands at 5.59%, while the typical five-year fixed mortgage is priced at 5.63%.
Tom Simpson, managing director of homes at Yorkshire Building Society, observed that while swap rates are 0.7% higher than they were a year ago, the current market remains less volatile than it was in March during the onset of the Iran war. He noted that the 0.1 percentage point increase observed over the past week is significantly lower than the 0.5 percentage point spike that followed the initial airstrikes on Tehran.
“All things being equal, you would expect a modest increase in mortgage rates based on what we’ve seen so far,” Simpson told the BBC. He advised concerned borrowers to consult with an independent mortgage adviser, noting that market movements often trigger a rush in demand as people attempt to lock in existing rates before further increases occur. The report also notes that as UK government bonds are known as, have been bigger than those in other countries, the moves in gilts. The report also notes that the consequences of the jump in bond yields could be serious for borrowers, although the turmoil in the bond markets eased on Thursday. The report also notes that that is because UK swap rates – the interest rates that banks charge when they borrow from each other – have been pushed up by the rise in gilt yields. The report also notes that it could undermine Andy Burnham’s efforts to ease cost of living pressures, if the cost of government borrowing continues to remain high. The report also notes that “When there is a movement in the market, that can pull forward demand.
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