Second job tax implications

[chlodah]

I have a main job but by default I’m now also running another business due to failing health of a friend. He wants to write me a cheque for all the work I’m doing and I don’t mind paying tax on this, but how do I go about that, do I just send HMRC 20% of what he pays me? I don’t really want to go on his payroll as an employee nor do I really want to submit invoices etc - I really don’t know what’s involved! Any help appreciated thank you

[PallasAthena]

You can't just send HMRC money (and what about National Insurance?). And he can't just give you money out of company funds with no documentation to support it.

Does his business have an accountant who can advise you? Does it have existing employees?

In your current main job are you and employee paid under PAYE?

[atticus]

You might contact HMRC.

You may need to deal with this through a tax return. In that event, put more than sufficient money in a deposit account until you need to pay the tax.