Hi Zoe,
Your client is liable to Class 4 NIC on his subcontracting profits in the same way as any other self-employed person unless he is exempt by reason of youth or age. You can't, of course, discuss other people's affairs with him in detail, but it is possible they don't realise Class 4 NIC is part of the self-assessment tax bill. As to whether he gets a bill or a rebate, it depends on the level of his profits, which may be different from other people's.
Regards,
Jonathan
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