The Office for Budget Responsibility (OBR) has announced the specific periods during which it will collect financial market data to inform its March 2026 economic and fiscal forecasts. This detail is crucial for understanding the assumptions that will underpin the government's future spending plans and the broader economic outlook for the UK.
According to the OBR, the average interest rates and other market determinants used for the final pre-measures economy forecast will be based on data collected over the 10 working days leading up to 22 January. A separate, but related, window has been set for the interest rates incorporated into the final pre-measures fiscal forecast, spanning the 10 working days to 30 January.
These defined data collection windows are significant because they lock in the OBR's expectations for key economic variables such as interest rates, inflation, and economic growth. These expectations then feed into the OBR's projections for government borrowing, debt, and the overall health of the UK economy. Any shifts in market sentiment or economic data during these specific periods will directly influence the OBR's official forecasts.
For UK households and businesses, the OBR's interest rate assumptions are particularly important. Mortgage rates, business borrowing costs, and the returns on savings accounts are all heavily influenced by the Bank of England's official Bank Rate and the wider market's expectations for future rate movements. A higher assumed interest rate in the OBR's forecast could imply a more challenging environment for borrowers, while potentially offering better returns for savers, though this is not investment advice.
The OBR's forecasts are a cornerstone of the UK's economic policy framework, providing an independent assessment of the government's finances. They are typically published alongside major fiscal events, such as Budgets or Autumn Statements, offering transparency and accountability. Investors in the FTSE 100 and other UK markets closely scrutinise these forecasts for insights into the future economic landscape, which can impact corporate earnings and investor sentiment.
The precise timing of these data windows means that any significant economic news or market movements occurring outside these periods will not be directly reflected in the OBR's initial assumptions, though subsequent updates or revisions are always possible. This highlights the snapshot nature of these official forecasts and the dynamic environment of financial markets.