The associated-company trap for multi-store owners
The corporation tax bands (19% up to £50,000, 25% above £250,000, Marginal Relief between) are divided by the number of associated companies. A pharmacy owner with three separate trading companies does not get three full lower-rate bands; the limits divide, and each company's effective threshold falls. Multi-store owners who structure through separate companies often pay significantly more CT than they would under a group structure that uses those limits more efficiently.