Calls to tax billionaires are growing. Is there a better way to tax the rich?

Billionaire tax proposals are gaining traction, raising the question of whether Australia should tax the ultra-wealthy more. While some countries like California and the United Kingdom have introduced or are considering billionaire taxes, Australia has been relatively quiet on the issue. However, the debate over taxing billionaires is not unique to Australia and reflects a broader issue of inconsistent tax treatment of wealth and income in the country.

High-net-worth individuals in Australia amass wealth through various means, including trusts, private companies, capital gains, and tax minimisation strategies. One significant contributor to wealth accumulation for billionaires is unrealised capital gains - the increase in value of assets like stocks, real estate, artwork, or classic cars that have not been sold.

For example, the wealth of Australia's 200 richest people grew from $197 billion to $707 billion over a decade, with unrealised capital gains playing a substantial role.

Unlike wages, which are taxed annually, unrealised capital gains are generally not taxed each year. These gains are only taxed when the asset is sold, allowing billionaires to defer taxes on their wealth. This tax advantage contributes to their ability to maintain lower tax rates compared to workers whose income primarily comes from wages.

Several solutions have been proposed to address this issue, such as imposing a wealth tax on billionaires or taxing unrealised capital gains as they arise. However, implementing a wealth tax is challenging due to difficulties in valuing assets and their fluctuating values. Moreover, many countries do not tax unrealised capital gains, making it a less common approach.

Australia already has some wealth taxes, like land taxes on investment properties and taxes on large superannuation balances. However, these taxes have limited scope and application. For instance, the family home, a significant store of household wealth in Australia, remains untaxed, except for stamp duty on purchase.

Inconsistencies in Australia's tax system affect all citizens, creating inequities and discouraging economic growth. While recent tax changes, such as those related to negative gearing and the capital gains tax discount, address some of these issues, more needs to be done. Simply taxing billionaires may not be the complete solution; the larger task is to build a tax system that treats different forms of wealth consistently.

This approach would ensure that the tax system is fairer and more productive for everyone, not just billionaires.