Verified facts
UK public sector net debt excluding public sector banks was provisionally estimated at £3,005bn at the end of September, taking the cash total above £3tn for the first time.
The ONS estimated debt at 94.0% of gross domestic product. That ratio was lower than a year earlier, despite the higher cash amount. A cash record and a rising share of the economy are not the same claim.
Public sector net borrowing was £24.5bn in September. Borrowing is the shortfall between spending and income over a period; debt is a balance-sheet stock at a point in time. The two figures should not be added together as separate bills.
Apolifina analysis
For gilt investors, the significance lies in the financing outlook, inflation and the return required to lend, rather than the round-number milestone alone. These figures do not establish how gilt yields will move.
Nor do they announce a tax change. Any Budget measures need to be assessed when the government publishes them, with policy proposals distinguished from enacted rules.
Uncertainty and risk
The estimates are provisional and can be revised. The GDP denominator is also estimated. Gilt prices can fall, including when market yields rise. This article is general information, not a recommendation to buy or sell bonds.
Primary sources
- ONS public-finance bulletin
- Debt series HF6W
- Borrowing series J5II — note the series sign convention
- Debt-to-GDP chart download
- Treasury statistical publication
Sources released and rechecked on 21 October 2026.
Continue reading: August borrowing coverage; digital gilt explainer