Although I have 40 years contributions, the HMRC website it is showing that I still need to contribute a further 6 years to get the maximum £168 as opposed to a current projection of £144. I'm informed that due to teachers being members of the Teachers Pension scheme I have paid reduced NI. Since retirement I work one day a week as a sixth form mentor and as an invigilator at a university and school. Can I therefore pay class 2 contributions as a lump sum for April 2019-2020? and monthly instalments thereafter Just wondered if anybody was in a similar position?