Glossary · UK
What is Same-Day Rule (Share Matching)?
CGT rule matching share sales first against same-day purchases of identical shares.
Full Definition
For UK Capital Gains Tax, disposals of shares are matched in a strict order: first against acquisitions on the SAME day (the same-day rule), then against acquisitions in the next 30 days (the bed-and-breakfasting rule), then against the Section 104 share pool. The same-day rule prevents artificial gains and losses created by intraday round-trips. The rule applies per share class per company per holder, so it does not block matching between, say, ordinary shares and preference shares. Knowing the matching order is essential when planning ISA top-ups, loss harvesting, or stock option exercises.
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Disclaimer: Definitions are for guidance only. For decisions about your tax, savings, property or pension situation, always consult a qualified professional or refer to gov.uk.