Laffer Curve in the United Kingdom?

The recent data released by HM Revenue & Customs has shown a significant decrease in capital gains tax (CGT) revenue for the UK government. Despite the government’s efforts to boost revenue by cutting allowances and increasing tax rates, the CGT take fell by 18% to £12.1bn in the 2023-24 fiscal year. This decline comes as a surprise, considering that the annual tax-free allowance was halved from £12,300 to £6,000, exposing more taxpayers to the tax.

The slashing of allowances by the previous Conservative government in 2023-24 led to an additional 87,000 taxpayers becoming potentially liable for CGT, bringing the total number of taxpayers exposed to the tax to 378,000. Furthermore, the tax-free allowance was halved again to £3,000 a year in 2024-25, further increasing the tax burden on individuals. Chancellor Reeves also increased CGT rates in her Budget last October, raising them to between 18 and 32%, up from the previous rates of between 10 and 28%.

Some experts have suggested that the revenue drop may be temporary, as investors may have delayed realizing capital gains in response to the higher tax rates. They predict that tax revenues may rise briefly in 2024-25 before declining again. However, the long-term implications of higher tax rates on capital gains should not be overlooked. Individuals and businesses may gradually shift their income and assets to lower taxed areas, such as Ireland, to reduce their tax liability.

The current economic challenges facing European countries, including the UK, may be attributed to the long-term effects of tax and spending policies that have eroded the tax base. Countries with lower tax burdens, like Switzerland, have fared better economically compared to their highly taxed neighbors. When countries increase their capital gains taxes, three main effects are observed: lower revenue in the short run, somewhat higher revenue in the medium term, and disappointing revenue in the very long run as individuals and businesses adjust their tax planning strategies.

In conclusion, the British government’s attempt to boost CGT revenue through cuts in allowances and increased tax rates has not yielded the desired results. As investors and taxpayers respond to incentives in complex ways, it is essential for policymakers to consider the long-term implications of tax policy changes on revenue generation and economic growth.