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4115. Why there is a small variation between your calculation results for NICs and my own?

There are two ways of working out National Insurance Contributions (NICs).
1.The table method - this manual method uses the National Insurance tables provided by the HMRC.
2.The exact percentage method - here NICs are calculated using the employee's gross pay.
Both methods use the same earnings limits and rates and both are equally acceptable by the HMRC . However, the two different methods do lead to slight variations in the NICs that are calculated. Our program uses the exact percentage method to work out NICs.