I have been working part-time before I got 21 years old just a few weeks. My employer paid me at minimum wage rate of 18-20 years old (4.98 pounds). I still get paid as before because my boss does not know that it has past my birthday. It was partly my fault that I did not tell her. I still got tips money from customers, so I don't bother get 18-20 yo rate. Until yesterday, my boss gave me official payment receipt of my wages. I usually don't get it. It had my NI number in it.
My questions are
1. Will this affect anything on my NI?
2. Am I doing something illegal?
3. I work just 5-7 hrs/ week. I know that we pay national insurace contribution when we earn more than 149 pounds a week. I earn less than that so it won't affect anything eventhough I use this rate right
4. Is it ok to keep this going? I don't want my boss to cut my working hours. There are so many part- timer and it is hard to find a job in small town.
Thank you