Office for Budget Responsibility

The Office for Budget Responsibility is the United Kingdom's independent fiscal watchdog, responsible for producing official economic forecasts used to set public spending and taxation policy. It entered the AI jobs debate when it modelled a worst-case AI scenario: 500,000 additional unemployed workers, no corresponding growth uplift, and £9 billion in extra government borrowing. The figure was referenced in the Bank of England's March 2026 agents' summary, which confirmed that UK organisations are already meeting demand without additional hiring through AI productivity gains, with task-time savings ranging from 5-20% in standard cases to 70% for highly automatable activities.

Established by the Budget Responsibility and National Audit Act 2011, the OBR operates independently of HM Treasury and publishes two major forecasts per year alongside regular economic and fiscal outlooks. Its core function is to assess whether the government's fiscal rules are being met and to project public borrowing requirements. The OBR does not make policy — it stress-tests scenarios. Its AI displacement model sits in the same category as its Brexit cost estimates and pandemic fiscal projections: authoritative worst-case framing that politicians can accept, ignore, or contest.

The £9 billion borrowing figure carries specific weight: it is the Treasury's own independent forecaster pricing the fiscal cost of a structural employment shock. The same logic that connects AI Job Displacement to income tax revenue shortfalls (documented by Brookings in Update #2 for the US) applies directly to UK public finances, where labour taxation accounts for the majority of HMRC receipts. If the OBR scenario materialises, the fiscal math forces a choice between cutting public services or raising taxes on a smaller employed base.