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National Insurance Contributions (NIC's)is a mandatory wage deduction which is used to fund certain state benefits such as your pension.
There are two types of National Insurance Contributions, those made by the employee and those by the employer, you can read about Employers NIC's here.
From the age of 16 to Pensionable age, employees and employed people pay National Insurance Contributions (NIC), providing their salary reaches a certain level.
There are a number of legal and legitimate ways of reducing the amount of NIC that your pay, read this article for examples of how you can pay less NIC..
Certain individuals elect to pay voluntary NIC's when they are not required, in their current circumstance, to pay National Insurance Contributions.
Individuals may elect to pay NIC's because: