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Employment and Pensions: Pensions
Under the Pensions Act 2008 if the PCC is an employer it must put certain staff into a workplace pension scheme and contribute towards the pension.
There are full details on the pension regulator website here.
There are multiple pension providers available and the government has also set up a scheme called NEST specifically for small employers which you can view here.
Broadly speaking if you have an employee who is below state retirement age and is being paid more than £10,000 p.a. you will need to enrol them in an appropriate scheme and both you and they will make contributions. There are minimum levels of contributions but you can chose to contribute more.