Wealth taxes don’t always work the way governments hope they will. Here are some alternatives

With the UK government facing a multibillion pound gap between revenue and spending^[1], calls for a wealth tax are becoming louder.

More than 30 top economists^[2] recently wrote to the chancellor of the exchequer, Rachel Reeves, saying the measure could raise billions of pounds. A recent poll^[3] of more than 4,000 UK adults found that 75% would back a 2% tax on wealth above £10 million.

Economic insecurity, rising living costs and the rapid pace of de-industrialisation have been identified as causes of unrest^[4] and a fraying society. Targeting taxes at the ultra-rich could have the power to redistribute wealth and raise revenue on a substantial scale.

But the reality of implementing it is far from simple. While the concept may be compelling, a wealth tax might not be easy to put into action – and may not even create the expected revenue.

This is reflected in figures from the Organisation for Economic Co-operation and Development^[5] (OECD) that show wealth taxes are less common than they used to be. Of the 12 OECD countries that had a net wealth tax in 1990, just three have one now^[6] (Norway, Spain and Switzerland).

Taxing assets including savings, investments and property is harder than taxing income. It relies on very wealthy individuals self-declaring asset values and for all assets to be held under the same name. When it comes to properties, this is not always the case.

A lack of transparency and reliable data can then create a huge administrative burden and costs for the government imposing the tax.

After all, predicting the political and economic impact these taxes can have is difficult. A clear example is the UK government’s proposed change to inheritance tax rules for farmers.

This may be a well-intentioned policy^[7] aimed at a small number of ultra-wealthy individuals using farmland to avoid inheritance tax. But claims that it affects farming families who may not have high incomes but have cultivated their land for generations have sparked heated debate around the actual figure of farms affected^[8].

Despite the potential difficulties in implementation, there are countries that have made a wealth tax work. In Norway^[9], residents pay 1% tax on their global net worth above 1.76 million kroner (£130,000). But the calculations are far from simple – with caveats, exemptions and differentiated local rules.

For net wealth in excess of 20.7 million krone in 2023, the maximum wealth tax rate was increased to 1.1%. This led to some of Norway’s wealthiest people moving to countries with more favourable tax regulations.

Fortune^[10] reported that 82 Norwegians with a combined net wealth of about 46 billion kroner (£3.4 billion) left the country in 2022-2023, according to data from the country’s finance ministry.

Any solution must be focused on the ultra-rich “giving back”, reinvesting in the economy for the good of society, and shifting their mindset.

With the reality of a wealth tax proving difficult, here are some viable alternatives to raise revenues and social contributions from very wealthy individuals.

1. Revised tax on capital gains

An increase of capital gains taxation (tax levied on the profits made when someone sells an asset) may be needed. But while revisions are overdue – perhaps differentiating between wealth sources^[11] such as entrepreneurial effort, passive investment and speculative trading – this tax would rely on the ultra-rich selling their assets. Many buy by borrowing against them and avoid cashing them out, so wealth accumulates without being taxed.

A higher and more progressive tax on capital gains could be an initial solution to raise revenues. But if poorly designed, it may not be a long-term answer and could discourage some much-needed productive capital investments in the UK.

2. A fresh look at inheritance tax

Loopholes and exemptions allow some very wealthy families to slash their inheritance tax bills, in some cases allowing vast properties and assets to be passed on untouched.