OP
andekoch
get something in writing saying how much you get, who pays what and you should be ok. payslips are not strictly required if I remember right (although I have always provided them) but a P60 at the end of the tax year or when you leave is a legal requirement and this will clearly state how mych you got, how much tax and NI was paid (both employers and employees NI). If you are paying NI you will need to pay both employers and employees NI (if you are a company) or else it is a fixed rate and an adjustment is made (i think) once your end of year tax return is submitted. Yes you will need to submit a tax return since you are not strictly on PAYE.