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  • Voluntary NI contributions class two from abroad

    Hello,HMRC have confirmed that I can pay back two years of class two contributions.When I went onto the payment page,it asked for an 18 digit number,I contacted HMRC,and they sent me the number,I haven’t logged into the payment page yet,but I’ve just read on this forum that the number is made up of your national insurance number,surname,and that it doesn’t have to be 18 digits,it can be shorter,but no longer,can someone enlighten me,as I’m a little confused,if I don’t need an 18 digit number,why did HMRC give me one,someone said that was required for class 3 from the UK,I’m abroad and paying class two,thank you!