UK Gilts

What it is

A gilt is a UK government bond, a debt security issued by HM Treasury, denominated in sterling, and listed on the London Stock Exchange. The name comes from the original gilded edges on paper certificates. Two main types exist: conventional gilts, which pay a fixed semi-annual coupon and return face value at maturity, and index-linked gilts, introduced in 1981, whose coupon and principal are adjusted against the UK Retail Prices Index to protect against inflation. The UK Debt Management Office (DMO), an executive agency of HM Treasury established in April 1998 when debt management responsibility transferred from the Bank of England, runs all primary issuance through auctions to a network of authorised gilt-edged market makers (GEMMs) who underwrite sales and provide secondary-market liquidity. Gilts are quoted per £100 of face value; prices move inversely to yields.

History

The UK has raised money through government bonds since at least the founding of the Bank of England in 1694. The "gilt-edged" label reflects near-zero credit risk: Britain has never defaulted on interest or principal. In 1976, a balance-of-payments and inflation crisis, with UK inflation running near 25%, forced the government to seek the then-largest IMF bailout in Fund history, briefly shaking confidence in UK sovereign debt. Index-linked gilts were introduced in 1981 under Conservative Chancellor Geoffrey Howe, initially restricted to pension funds before opening to all buyers. The defining modern shock came in September-October 2022, when Prime Minister Liz Truss and Chancellor Kwasi Kwarteng announced £45 billion of unfunded tax cuts. Thirty-year gilt yields rose by more than one percentage point in days, triggering margin calls on leveraged liability-driven investment (LDI) strategies held by UK defined benefit pension funds. The Bank of England intervened with emergency purchases of long-dated gilts to prevent a fire-sale spiral. Truss resigned 45 days into office.

Current state

As of end-December 2025, total UK central government sterling debt stood at £2,982.2 billion, with public sector net debt at 95.0% of GDP. The DMO's 2026-27 financing programme plans to raise £252.1 billion through gilt sales: £97.3 billion in short conventional bonds (under seven years), £77.8 billion in medium conventional (seven to fifteen years), £23.0 billion in long conventional, £23.5 billion in index-linked, and £12.0 billion in green gilts, a category launched in 2021 to fund environment-linked spending. The Bank of England holds over 20% of outstanding gilts following its quantitative easing programme and is now gradually unwinding those holdings through quantitative tightening. Interest payments on UK public debt consume roughly 9% of government spending, comparable to the entire Department for Education budget. The 10-year gilt yield stood near 4.85% in late June 2026 as markets assessed the political transition following Keir Starmer's resignation.

Relationships

Sterling gilt markets sit at the centre of UK public finance. The Bank of England's Monetary Policy Committee sets the Bank Rate, anchoring short-end gilt yields; its Asset Purchase Facility, deployed in 2009, 2012, 2016, and 2022, has periodically bought gilts at scale to ease financial conditions. The DMO coordinates the annual financing remit with HM Treasury and the Office for Budget Responsibility's borrowing forecasts. Chancellor Rachel Reeves's fiscal rules, adopted under the Starmer government, required public sector net financial liabilities to be falling as a share of GDP by the fifth year of the forecast period; gilt yields are the key transmission mechanism between market confidence and those rules. 市場はバーナム首相誕生とリーブスの財政ルールの行方を注視する captures how sterling and gilts signalled investor concern over whether Labour's incoming leader Andy Burnham would maintain fiscal discipline after Starmer's June 2026 exit.

What to watch

• Whether a Burnham-led UK government retains Reeves's fiscal rules and the market credibility they underpin.
• The DMO's capacity to place £252.1 billion in 2026-27 as the Bank of England continues quantitative tightening.
• Long-dated and index-linked demand as defined benefit pension schemes mature and LDI strategies are de-risked following the 2022 crisis.
• Any rating-agency commentary on debt sustainability given the near-£3 trillion stock and 95% debt-to-GDP ratio.