The UK 10-year gilt yield rose to 4.55% after the Office for Budget Responsibility accidentally released its budget forecast early, before Chancellor Rachel Reeves’s speech. The OBR revealed a larger-than-expected £22 billion fiscal buffer, compared with the £15 billion investors anticipated. The report, however, also showed weaker GDP growth for 2026 and slightly higher inflation, creating a mixed market reaction. The OBR outlined several tax increases, including higher gambling duties, a levy on properties over £2 million, and a 2-point rise in dividend tax rates, adding up to £26.1 billion in new revenue by 2029–30. It also confirmed frozen income tax and national insurance thresholds until 2030–31. Markets swung on the unusual early release.