The ONS’s latest figures on what has been happening to wealth in Great Britain, released in January 2022, are already out of date, covering only the period up to March 2020, and therefore missing the effects of the pandemic. But they are also limited in another way: they underestimate the share of wealth going to the richest households. Given the debates about inequality, discussion about wealth taxes to pay for COVID-19, and the growing importance of inherited wealth as a share of lifetime resources, it is important to get this right. Looking back at the past 12 years of the ONS survey, the figures show that total wealth in Great Britain has risen from £10.4tn to £14.6tn (in 2016–18 prices), meaning average household wealth has risen from £402,100 to £564,300. Over the same period, the share of all wealth held by the wealthiest 10% of households has risen very slightly, from 44% to 45%. However, there are two problems with these figures. First, they do not include business wealth, which is an important source of wealth for the wealthiest households. Second, they substantially under-record the total wealth held by wealthy households, since, unsurprisingly, the very wealthy do not tend to respond to such surveys. Adjusting the data to account for business wealth – which is measured in the survey but excluded from official statistics – we find that total wealth in Great Britain is £0.7tn higher in 2016–18. This is about 5% of the current estimate, and the proportional underestimation has been similar back to 2010–12. After adding in wealth observed in the Sunday Times Rich List, and using a statistical approach to correct for the under-representation of other wealthy households, total wealth is higher still, by £0.5tn in 2016–18. Total GB wealth is therefore underestimated in the ONS figures by about 8%. After making these adjustments, the level of inequality is also higher (Figure 1). Adding business wealth into the calculation, the share of wealth owned by the wealthiest 10% of households actually rises significantly, by two percentage points. Consistent with the ONS figures, this has remained broadly steady over the period. Correcting for missing wealth at the top, we find the share of wealth going to the top 10% is further increased slightly, to around 47%, and still flat.

Past performance is not a reliable guide to the future. The value of investments and the income from them can go down as well as up. The value of tax reliefs depend upon individual circumstances and tax rules may change. The FCA does not regulate tax advice. This newsletter is provided strictly for general consideration only and is based on our understanding of law and HM Revenue & Customs practice as of January 2022 and the contents of the Finance Bill. No action must be taken or refrained from based on its contents alone. Accordingly, no responsibility can be assumed for any loss occasioned in connection with the content hereof and any such action or inaction. Professional advice is necessary for every case.