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OBR Poised to Cut UK Productivity Outlook, Raising Pressure for Tax Rises

The downgrade would swell the projected deficit by curbing growth-driven tax receipts.

Overview

  • Britain’s budget watchdog is expected to lower trend productivity by about 0.3 percentage points in forecasts due Friday, according to reporting cited by The Observer.
  • The Institute for Fiscal Studies estimates each 0.1 percentage‑point cut adds roughly £7bn to the 2029/30 shortfall, implying at least about £17.5bn from the anticipated downgrade.
  • The National Institute of Economic and Social Research warns the gap against the debt rule could reach about £41bn under weaker growth assumptions.
  • Ministers are weighing options including a reported 2p rise in income tax, changes to national insurance and an extended base covering rental income and the self‑employed, alongside higher property and pension‑related taxes.
  • Advisers have urged Chancellor Rachel Reeves to increase fiscal headroom from roughly £10bn to £20bn after abandoned welfare savings, the report says.