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UK government borrowing costs suffer historic rise after Kwarteng ‘shocks’ investors

UK government borrowing costs are on course for their biggest ever monthly rise following the bond market meltdown triggered by Kwasi Kwarteng’s fiscal policy announcement last week.

The 10-year benchmark gilt yield, which rises as bond prices fall, has increased by 1.45 percentage points so far in September, the largest monthly jump in Refinitiv data stretching back to 1979. Two-year yields have also lurched higher, from 3 per cent at the end of August to 4.5 per cent, the highest in more than 14 years.

“The moves are just extraordinary,” said Vivek Paul, UK chief investment strategist for the BlackRock Investment Institute. “The market has delivered its verdict [on the government’s fiscal plans] and it’s not a good one.”

The bulk of the sell-off has come during the last two trading sessions, after Kwarteng on Friday laid out the biggest package of tax cuts since the 1970s, alongside widely anticipated energy subsidies to shelter households from soaring gas prices. Bond investors have baulked at the extra borrowing pencilled in to pay for the plans, including an additional £70bn of debt sales in the current financial year alone.

The historic losses for gilts, which will feed through to a substantially higher interest bill for the government if they are sustained, have come amid a global rout in government debt. However, losses for UK bonds have outstripped rivals like German Bunds and US Treasuries.

The gap between UK and German 10-year borrowing costs has widened to 2.1 percentage points per cent from 1.3 percentage so far this month.

Adding to the pressure on gilts, Kwarteng’s announcement came a day after the Bank of England confirmed it will begin to sell gilts in its portfolio acquired under previous quantitative easing stimulus programmes, a process known as quantitative tightening. The BoE said it plans to reduce the size of its holdings by £80bn over the next 12 months, to £758bn.

“It’s the additional supply of gilts that’s really spooked markets,” said Jim Leaviss, head of public fixed income at M&G Investments. “Energy subsidies, tax cuts and QT all hitting the market simultaneously is a huge shock.”

The additional bond issuance announced to fund Kwarteng’s policy changes will make it tricky to push ahead with QT, which is scheduled to begin next month, according to Paul.

“The optics of selling gilts start to look really bad,” he said.

Line chart of Spread in 10-year bond yields (percentage points) showing Investors demand rising premium to buy UK debt over  German bonds

The long-term nature of Kwarteng’s tax cuts, as opposed to larger but temporary support for energy bills, has been the biggest worry to some investors.

“Because of the tax cuts, not the energy bill support, five years hence the UK deficit will be significant, bringing fiscal sustainability questions to the fore,” said Dean Turner, economist at UBS Wealth Management.


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