NIM70900 | Class 2 National Insurance contributions: general information: voluntary contributions
From HM Revenue & Customs · National Insurance Manual
Regulations 87A, 88, 89, 90 and 146-148 of the Social Security (Contributions) Regulations (SSCR) 2001 (SI 2001 No. 1004)
Who can pay voluntarily?
There are 3 groups of persons who are not liable to pay Class 2 National Insurance contributions (NICs) but who are entitled to pay them voluntarily:
Notifying HMRC of the date a person wants to start or stop paying Class 2 NICs voluntarily
Those who are entitled and choose to pay Class 2 NICs voluntarily should tell HMRC, in writing or by electronic communications approved by HMRC, when they become or cease to be entitled to pay Class 2 NICs. They should do this on the date they wish to start or stop paying Class 2 NICs. There is no penalty for not telling HMRC when they want to start or stop paying Class 2 NICs voluntarily.
Notifying a change of address
A person paying Class 2 NICs voluntarily should tell HMRC immediately of any change of address, in writing or by electronic communications approved by HMRC. If they fail to do this there is no penalty.