The idea of a wealth tax has raised its head – yet again – as the government attempts to balance its books.

Downing Street refused to rule out a wealth tax after former Labour leader Lord Kinnock told Sky News he thinks the government should introduce one.

Sir Keir Starmer’s spokesman said: “The prime minister has repeatedly said those with the broadest shoulders should carry the largest burden.”

While there has never been a wealth tax in the UK, the notion was raised under Rishi Sunak after the COVID years – and rejected – and both Harold Wilson’s and James Callaghan’s Labour governments in the 1970s seriously considered implementing one.

Sky News looks at what a wealth tax is, how it could work in the UK, and which countries already have one.

What is a wealth tax?

A wealth tax is aimed at reducing economic inequality to redistribute wealth and to raise revenue.

It is a direct levy on all, or most of, an individual’s, household’s or business’s total net wealth, rather than their income.

The tax typically includes the total market value of assets, including savings, investments, property and other forms of wealth – minus a person’s debts.

Unlike capital gains tax, which is paid when an asset is sold at a profit, a wealth tax is normally an annual charge based on the value of assets owned, even if they are not sold.

A one-off wealth tax, often used after major crises, could also be an option to raise a substantial amount of revenue in one go.

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How could it work in the UK?

Advocates of a UK wealth tax, including Lord Kinnock, have proposed an annual 2% tax on wealth above £10m.

Wealth tax campaign group Tax Justice UK has calculated this would affect about 20,000 people – fewer than 0.04% of the population – and raise £24bn a year.

Because of how few people would pay it, Tax Justice says that would make it easy for HMRC to collect the tax.

The group proposes people self-declare asset values, backed up by a compliance team at HMRC who could have a register of assets.

Which countries have or have had a wealth tax?

In 1990, 12 OECD (Organisation for Economic Co-operation and Development) countries had a net wealth tax, but just four have one now: Colombia, Norway, Spain and Switzerland.

France and Italy levy wealth taxes on selected assets.

Colombia

Since 2023, residents in the South American country are subject to tax on their worldwide wealth, but can exclude the value of their household up to 509m pesos (£92,500).

The tax is progressive, ranging from a 0.5% rate to 1.5% for the most wealthy until next year, then 1% for the wealthiest from 2027.

Norway

There is a 0.525% municipal wealth tax for individuals with net wealth exceeding 1.7m kroner (about £125,000) or 3.52m kroner (£256,000) for spouses.

Norway also has a state wealth tax of 0.475% based on assets exceeding a net capital tax basis of 1.7m kroner (£125,000) or 3.52m kroner (£256,000) for spouses, and 0.575% for net wealth in excess of 20.7m kroner (£1.5m).

The maximum combined wealth tax rate is 1.1%.

The Norwegian Labour coalition government also increased dividend tax to 20% in 2023, and with the wealth tax, it prompted about 80 affluent business owners, with an estimated net worth of £40bn, to leave Norway.

Spain

Residents in Spain have to pay a progressive wealth tax on worldwide assets, with a €700,000 (£600,000) tax free allowance per person in most areas and homes up to €300,000 (£250,000) tax exempt.

The progressive rate goes from 0.2% for taxable income for assets of €167,129 (£144,000) up to 3.5% for taxable income of €10.6m (£9.146m) and above.

It has been reported that more than 12,000 multimillionaires have left Spain since the government introduced the higher levy at the end of 2022.

Switzerland

All of the country’s cantons (districts) have a net wealth tax based on a person’s taxable net worth – different to total net worth.

It takes into account the balance of an individual’s worldwide gross assets, including bank account balances, bonds, shares, life insurances, cars, boats, properties, paintings, jewellery – minus debts.

Switzerland also works on a progressive rate, ranging from 0.3% to 0.5%, with a relatively low starting point at which people are taxed on their wealth, such as 50,000 CHF (£46,200) in several cantons.