The UK government is preparing to significantly ramp up issuance of short-term Treasury bills (T-bills) as it battles to contain rapidly rising borrowing costs, but analysts at Goldman Sachs caution that the strategy offers only modest savings and comes with meaningful trade-offs in funding volatility.
The Debt Management Office (DMO) has recently signaled a clear policy shift through plans for regular 12-month T-bill issuance, improved repo facilities, and efforts to boost secondary market liquidity. Historically, the UK has relied far less on T-bills than its G10 peers, favoring longer-dated gilts for the bulk of its funding needs. This new approach marks a departure, moving T-bills from a tool primarily for day-to-day cash management toward a more structural role in overall debt financing.
The urgency is clear. This week, UK gilt yields surged amid political uncertainty. The benchmark 10-year gilt yield jumped more than 10 basis points on Tuesday to 5.105%, while 20-year and 30-year yields reached their highest levels since 1998. These moves reflect investor concerns over persistent deficits, sticky inflation, and questions about fiscal credibility under the Starmer government.
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Goldman Sachs Analysis: Modest Gains, Notable Risks
In a detailed note, Goldman Sachs analysts led by George Cole assessed the potential impact of increasing the share of T-bills in the UK’s debt mix.
“T-bills help manage the variations in government cash needs and cash balances, for example from seasonal fluctuations in tax receipts or unexpected issuance needs in the face of economic shocks,” the analysts wrote.
Raising the proportion of T-bills to around 10%, in line with the G10 average, would increase outstanding T-bills from the current £94 billion to roughly £296 billion. According to Goldman’s calculations, this could reduce annual funding costs by up to 10 basis points, saving the government around £3 billion per year by taking advantage of the upward-sloping yield curve.
However, the bank stressed that the benefits are far from transformative.
“The average improvement in interest costs needs to be weighed against the risks of funding volatility and increased uncertainty in future fiscal projections,” Cole wrote.
Shorter-dated debt must be rolled over more frequently, exposing the government to greater interest rate risk and making budgetary planning less predictable. This is particularly relevant in the current environment of elevated and volatile yields.
Demand Constraints Raise Questions
Goldman analysts also highlighted potential limitations on the demand side. Banks and financial institutions currently hold the largest share of T-bills (£27 billion of the £94 billion outstanding), but they have historically shown a preference for medium-term gilts. Domestic retail demand may remain muted, as T-bills must compete with savings accounts and tax-advantaged ISAs that often offer better after-tax returns and liquidity for ordinary investors. Foreign demand is also unlikely to grow significantly.
Cole questioned whether heavier reliance on short-dated debt would enhance credibility on inflation control: “Could reliance on short-dated debt increase credibility to maintain low inflation and thus low interest rates? It is not obvious that there should be a lasting compression of Gilt risk premium from higher T-bill issuance.”
He drew a parallel with the UK’s experience with inflation-linked debt, which was once seen as a commitment device but ultimately contributed to significant cost volatility during the recent inflation surge.
The push toward more T-bill issuance comes as the UK grapples with one of the highest debt-to-GDP ratios among major economies and elevated borrowing costs that are putting pressure on public finances. With political instability lingering after Labour’s disappointing local election results, markets are demanding higher risk premiums on longer-dated gilts.
While shifting the debt mix toward shorter maturities can deliver near-term interest savings, it does not address deeper structural challenges: sluggish economic growth, high welfare and pension spending, and the need for credible fiscal rules. Over-reliance on short-term funding could also complicate the Bank of England’s monetary policy decisions by creating more frequent refinancing risks for the government.
In summary, the UK’s move to expand T-bill issuance represents a tactical attempt to ease immediate pressure on borrowing costs. However, as Goldman Sachs highlights, it is no panacea. The strategy may deliver modest relief but increases exposure to refinancing risk and does little to restore long-term investor confidence in UK debt sustainability. This means the government will still need to demonstrate credible spending control and economic reform if it hopes to bring gilt yields down on a sustained basis.