A Company Share Option Plan (CSOP) is a UK tax-advantaged employee share scheme that allows companies to grant options to their employees to acquire shares in the company. Under a CSOP, employees are given the right to purchase shares in the company at a predetermined price, known as the option price, at some point in the future.

CSOPs are a popular way for companies to incentivize and reward their employees and to promote ownership and commitment to the company. They are typically offered as part of an employee's compensation package and may be tied to performance or other conditions. CSOPs have various tax advantages for both employees and companies. Employees who exercise their options and acquire shares may be eligible for tax relief, and companies may be able to claim a tax deduction for the cost of the options. It is important for both employees and companies to understand the tax rules surrounding CSOPs and to carefully consider the potential tax implications of participating in a CSOP.