The Capital Gains Tax essentials you need to know

The amount of Capital Gains Tax (CGT) investors collectively pay is set to soar over the next six years.

According to a Telegraph article (11 December 2025), the Office for Budget Responsibility (OBR) has adjusted its estimate for how much will be raised through taxes, including CGT.

The OBR now predicts revenue from CGT will reach £114 billion between the 2025/26 tax year and 2029/30 – an increase of £6 billion on its previous forecast. Indeed, by 2030, the levy is expected to double in just six years, generating £30 billion annually for the government.

Investments that aren’t held in a tax-efficient wrapper may be liabl