Have Tax Questions? Ask a Tax Expert for Answers ASAP
Hello, I am one of the experts on Just Answer and pleased to be able to help you with your question.
I may be a bit thick and stupid, but your question does not hang together. In your part time self employment the payment of tax and NI is your personal responsiblity. Perhaps you mean that your full time employer is not deducting these taxes in which case you should report their antics to HMRC.