Most people are familiar with Income Tax, which is paid on earnings from a job or self-employment. Capital Gains Tax, or CGT, is different. It’s a tax on the profit you make when you get rid of an asset that has increased in value.

The key word here is profit. You don’t pay tax on the entire amount of money you receive, only on the gain. Think of it as the government's way of taxing wealth you've accumulated from investments, rather than the money you earn week to week.

The purpose of CGT is to tax the increase in an asset's value from the time you acquired it to the time you dispose of it. If you sell an asset for less than you paid for it, that's a capital loss, and you wouldn't owe any CGT.

CGT applies to a wide range of assets, not just property or stocks. When you 'dispose' of an asset, it doesn’t just mean selling it. It can also include giving it away, swapping it for something else, or receiving compensation for it, like an insurance payout if it was destroyed.

Some common assets that are subject to CGT include:

• Personal possessions worth more than a certain amount (currently £6,000), such as jewellery or paintings.
• Property that isn’t your main home, like a buy-to-let property or a second home.
• Your main home if you've let it out, used it for business, or it's very large.
• Shares and investments that are not held in a tax-efficient account like an ISA or PEP.
• Business assets.

However, some assets are usually exempt. For instance, you typically don't pay CGT on your private car, your main home, or the contents of your ISA.

To figure out if you owe CGT, you first need to calculate your gain. The basic calculation is straightforward: take the amount you sold the asset for and subtract the amount you originally paid for it. You can also deduct certain costs associated with buying and selling the asset, like solicitors' fees or Stamp Duty.

For example, if you bought a painting for £5,000 and sold it years later for £12,000, your initial gain would be £7,000. From this, you could deduct any costs you incurred, like auction house fees.

It's also important to know that everyone has an annual tax-free allowance for capital gains, known as the Annual Exempt Amount. You only pay CGT on gains that exceed this allowance in a given tax year. If your total gains fall below this threshold, you won't have to pay any tax on them.

Understanding these core principles is the first step in navigating the world of Capital Gains Tax. It's a tax on profits from assets, with clear rules about what's included and a tax-free allowance to consider.