Share Buyback Tax Calculator UK

For UK shareholders, a share buyback is generally treated as a disposal for Capital Gains Tax purposes, giving rise to a gain equal to the proceeds minus the original cost. However, HMRC may reclassify a buyback as a distribution (income) in certain circumstances, particularly if it is used to return profits rather than reduce share capital.

Capital gains on share buybacks are taxed at 18% (basic rate) or 24% (higher/additional rate) for the 2024/25 tax year following the October 2024 Budget changes. Each individual has an annual CGT exemption of £3,000 (2024/25 onwards). Business Asset Disposal Relief at 10% may apply if conditions are met.

Yes — UK limited companies can buy back shares under the Companies Act 2006. The company must have distributable profits or use fresh share capital. A purchase of own shares (POS) must be funded out of distributable profits or capital in specific circumstances and requires shareholder approval.

A dividend is a distribution of company profits to all shareholders proportionately, taxed as income (up to 39.35% for additional rate taxpayers in 2025/26). A share buyback selectively returns cash to specific shareholders and is typically treated as a capital disposal, taxed at lower CGT rates — making it potentially more tax-efficient for higher-rate taxpayers.

Yes — any capital gain from a share buyback must be reported on your Self Assessment tax return in the year of disposal. If the gain exceeds the annual CGT exemption (£3,000 in 2024/25), you will owe CGT. Gains must also be reported via HMRC's real-time CGT reporting service within 60 days if the shares are unlisted.