Updated: The Helpbook CA38 for use from 6 April 2018 to 5 April 2019 has been published.
Use the tables in this booklet to calculate National Insurance contributions (NICs) for employees and for whom NICs are payable under contribution Table letters A, H, J, M and Z.
NICs table letters M and Z are effective from 6 April 2015.
NICs table letter H is effective from 06 April 2016.
Source: HMRC