We are hoping to take on a part time nanny. I understand she needs to be employed by us. She will be earning less than £149 a week from us so will be below the tax and NI threshold. How straightforward is it to run your own payroll? I'm reluctant to pay a payroll company if I don't have to, as I won't be earning much more than her and would like to keep the costs down but if I'm tearing my hair out every month, then it may not be worth it. Has anyone done it themselves?
Also, she does other (non-nannying) work on a self-employed basis. Does this affect our tax/NI contributions or is this just something she works out at the end of the tax year, based on what she has already earned from us?