Hello,

Let me tell you that everyone who wants to work in the UK MUST have a National Insurance Number (NIN). The NIN acts as an account number and makes sure that you pay the correct amount of tax and National Insurance contribution.

• Every UK citizen is issued with a National Insurance Number (NIN) at the age of 16. Everyone that wants to work in the UK needs to have a NIN. The NIN acts as an account number and makes sure that you pay the correct mount of tax and National Insurance contribution.
• If you intend to work while studying in the UK, any employer will require you to provide them with your National Insurance Number (NIN), so that they can pay your wages and make any applicable tax/national insurance deductions. UK residents are allocated a number automatically at the age of 16; however, being a European or International student you will not have this number so you will need to apply for one.
• National Insurance is a compulsory government tax that is automatically deducted from your pay if you earn more than £157 per week from a job (for the tax year starting in April 2018). National Insurance contributions are usually about 12% of your pay. All employees must pay National Insurance, international students are not excluded. You cannot claim National Insurance contributions back.

I hope this would help you  For further queries please feel free to write me down in the comment box.