22OCT

UK net debt passes £3trn at 94.0% of GDP

3 min read

16:23UTC

Britain's net debt reached £3,005.0bn at the end of September on the ONS's first estimate, yet at 94.0% of GDP it sat below the OBR forecast and below a year earlier.

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EconomicAssessed

Key takeaway

Debt passed £3trn in cash, but at 94.0% of GDP it sits below forecast and a year earlier.

Britain's national debt passed £3 trillion for the first time at the end of September, the Office for National Statistics (ONS) said on 21 October. Its first estimate put public sector net debt, what the state owes minus the cash it holds, at £3,005.0bn⁠¹. Excluding the Bank of England, the figure was £2,897.8bn.

As a share of gross domestic product (GDP), debt stood at 94.0%, up from the 93.8% printed for the end of August. That left it 1.2 percentage points below the forecast of the Office for Budget Responsibility (OBR), the official forecaster, and 0.7 points lower than a year earlier. The cash total grows with prices, and so does the economy it is measured against. A household whose mortgage rises by less than its pay owes more and is less stretched; lenders read the ratio.

The ONS will revise both figures. In August it raised June's net debt by £4.9bn on updated Bank of England data. A ratio flattered by fast cash growth in GDP can also turn quickly once inflation falls. On the question this topic asks, whether Britain can still borrow, the September data say yes; what moved against the government was the cost of that borrowing, which ran ahead of forecast.

Deep Analysis

In plain English

The government spends more than it collects in tax most years, and borrows the difference. The total it owes, minus the cash it holds, is called public sector net debt. That total has now passed £3 trillion. On its own the number sounds alarming, but it means little without context. A household with a £300,000 mortgage is in very different shape on £30,000 a year than on £150,000. So economists compare the debt with the size of the whole economy, measured by gross domestic product (GDP). Britain's debt is 94% of a year's national output. That share is slightly lower than a year ago, which is why the official statistics body, the Office for National Statistics, says the ratio has not worsened over the year.

Deep Analysis

Root Causes

The cash stock rises whenever the state borrows at all, and the government has run a deficit in every year since 2001-02. A £3 trillion milestone was therefore a question of when, not whether, once borrowing stayed positive.

The ratio depends on nominal GDP, which inflation inflates as fast as real growth. Since 2022 prices have done much of the work of holding the ratio down, a support that fades as inflation returns towards the Bank of England's 2% target.

The Bank's own balance sheet also moves the headline. Net debt excluding the Bank of England was £2,897.8bn, about £107bn lower, because the Bank's gilt holdings and its losses on them pass through the public sector total.

What could happen next?

Meaning
The £3 trillion cash milestone does not by itself signal worse debt sustainability, because the ratio to GDP fell over the year.
Immediate · Assessed
Risk
If inflation falls faster than forecast, nominal GDP growth slows and the debt ratio could start rising even with borrowing on plan.
Medium term · Suggested
Consequence
The first estimate of 94.0% is likely to be revised, so the month-on-month rise from 93.8% may narrow or widen at the next release.
Short term · Suggested

Source Landscape

This story draws on neutral-leaning sources

Primary parallel: Britain ended The Second World War with debt above 200% of GDP and never repaid it in cash. The stock kept rising for decades while growth and inflation pulled the ratio below 50% by the mid-1970s, the mechanism the ONS ratio still relies on.

Counter-parallel: Italy ran primary budget surpluses for most of the years after 1992 yet its debt ratio never fell below 100%, because interest on the stock ate most of the surplus. A ratio falls only when the primary surplus outweighs the gap between the interest rate on the debt and nominal growth.

Immediate: the 94.0% reading is a first estimate and ONS debt figures are routinely revised, as the £4.9bn upward revision to end-June debt showed. A swing of 0.2 points either way at the next release would be normal.

Structural: the gap between cash debt and ratio is a measure of how much inflation is carrying. With the IMF forecasting UK real growth of 1.3% in 2026, most of the nominal GDP growth keeping the ratio flat comes from prices, not output.

Consensus view: The Office for Budget Responsibility judges debt sustainability on the ratio to GDP, not the cash stock, and the September ratio sits below its March path. The Resolution Foundation's reading is that the strain shows in the flow instead: about £1 in every £12 of public spending now goes on interest.

Counter-view: Reform UK's Treasury spokesman Robert Jenrick argues the cost of carrying the stock is the problem, claiming £30bn a year could be saved if British borrowing costs fell to French and Italian levels.

France carries gross debt of 119.0% of GDP on INSEE's June figure yet borrowed for 10 years about 0.7 points more cheaply than Britain on 6 October.

Key tension: Whether a ratio held near 94% by fast cash growth in GDP survives a fall in inflation, when the denominator slows but the interest already locked in does not.

Sources:Office for National Statistics

Mentions:Office for National Statistics →Office for Budget Responsibility →United Kingdom →Bank of England →England →Resolution Foundation →INSEE →Italy →France →Robert Jenrick →Reform UK →World War II →

First Reported In

Update #5 · Debt passes £3trn, its ratio below forecast

Office for National Statistics· 22 Oct 2026

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Different Perspectives

Pension Protection Fund

Acting chief actuary Aaron Pang put the rise to 135.0% funded down to liabilities falling 2.1% against a 1.0% fall in assets, reflecting higher gilt yields. On Lowdown's reading, the yields that lift the Treasury's interest bill leave 4,838 company schemes with a £280.7bn surplus that does not reduce state borrowing.

Torsten Bell

The Labour figure wrote on 14 October that the IMF's October figures show the fastest fiscal consolidation in the G7. The IMF forecasts the UK deficit falling from 3.8% of GDP in 2026 to 1.4% in 2031, a squeeze still to be delivered through taxes and spending.

Tax Justice UK

The left-leaning campaign group says ten tax reforms would raise over £60bn a year for public services, and on 22 October asked why higher taxes on extreme wealth remain politically difficult. It offers the tax-led exit to the IEA's cuts; the £60bn is its own claim, not an official costing.

Institute of Economic Affairs

The free-market think tank's Alternative Budget of 19 October would suspend the state pension triple lock for three years, freeze welfare in cash terms and move tax onto a wider VAT. It claims the day-to-day budget returns to surplus in 2027-28, its own projection rather than an official costing.

Resolution Foundation

The living-standards think tank said welfare spending ran about £2.5bn above expectations in September, City AM reported on 21 October, and its economist Greg Thwaites urged targeted energy support. Its figure lands as a Chancellor who calls welfare cuts a moral duty finalises the 28 October Budget.

Institute for Fiscal Studies

Director Helen Miller said a steady-as-she-goes Budget is not an option, with the IFS putting 2029-30 headroom at about £20bn, The Independent reported on 12 October. The IFS puts the cost of avoiding cuts and funding higher defence at around £35bn of tax rises or benefit cuts, more than any headroom estimate in circulation.

Written with AI from Lowdown's published reporting. Not individually reviewed by an editor. Editorial standards.