UK April inflation overstated because of car tax error, UK statistics agency says

The U.K.'s Office for National Statistics (ONS) revised April's annual inflation rate down to 3.4% from an initially reported 3.5% due to an error in car tax data calculation. The ONS stated that incorrect Vehicle Excise Duty (VED) data from the Department for Transport overstated the number of vehicles subject to VED rates, impacting both the CPI and RPI by 0.1 percentage points for the year to April 2024. While the ONS apologized and will use corrected data going forward, the error further damages the agency's reputation regarding data accuracy, though the revised figure still exceeds the 3.3% expected by Reuters analysts.

Analysis

The U.K.'s Office for National Statistics (ONS) has revised the annual Consumer Price Index (CPI) for the year to April 2024 downwards by 0.1 percentage points, from an initially reported 3.5% to 3.4%. This adjustment was attributed to an error in Vehicle Excise Duty (VED) data provided by the Department for Transport, which overstated the number of vehicles subject to certain VED rates. Critically, the revised 3.4% inflation rate for April 2024 still exceeded the 3.3% consensus forecast from Reuters analysts, suggesting inflationary pressures remained marginally stronger than anticipated even post-correction. The ONS apologized for the error, noting the affected historical statistics will not be formally amended but confirmed that correctly weighted data will be utilized for figures from May 2024 onwards and that its quality assurance processes for external data sources are under review. This error has been characterized as an 'unwelcome smear' on the ONS, potentially impacting its credibility and contributing to the 'mildly negative' sentiment and 'uncertain' tone surrounding current U.K. economic data releases, despite the market impact score being low.

Key Decisions for Investors

• Investors should note that while the April 2024 U.K. CPI was revised down to 3.4%, this figure still surpassed analyst expectations of 3.3%, indicating that underlying inflationary pressures may be more persistent than the headline revision alone suggests.
• The acknowledged data error by the ONS warrants increased scrutiny of future U.K. economic data releases, as questions regarding data accuracy and reliability could introduce higher uncertainty into market analysis and forecasting.
• While this specific 0.1 percentage point inflation revision is unlikely to be a primary driver for immediate, significant shifts in monetary policy expectations or asset allocation, the incident underscores the importance of data integrity and could cumulatively affect investor confidence if such issues recur.