ONS public sector finances, 22 September 2026: borrowing in the financial year to August 2026 was £77.3bn, £8.1bn above the OBR forecast.
The market resolves on the ONS public sector finances bulletin published on ons.gov.uk on 22 September 2026; YES if the bulletin itself states that cumulative April to August 2026 borrowing is above the OBR's March 2026 profile for the year so far. The ONS's own stated comparison is canonical and no independent recomputation against OBR tables is permitted. Baseline at publication: April to July borrowing stood £2.3bn above profile (ONS, 21 August 2026). By 23:59 BST on 22 September 2026. If that source has not published in time, BBC News and Reuters settle it.
We found four times since 2008 when UK borrowing ran above the official forecast in the months before a chancellor's next Budget or big statement. For each, we checked whether that event raised taxes overall or set out a plan to cut the deficit. This year's overshoot is the one being tested, so it is not among the four.