How to Get Your 18-Digit Reference Number for NIC Record Top-up Online?

Q. I want to Top Up my NIC Record by Paying to Complete Seven Tax Years. To Pay Online I Need an 18-Digit Reference Number which is Only Available by Calling HMRC, but the HMRC Telephone Line is Never Answered. How Can I Make the Payment?

A: It is difficult to get through to HMRC by phone, and that is why the deadline for making voluntary NIC payments has been extended to 31 July 2023, as we explained above.

You can pay the NIC due by cheque made out to “HM Revenue and Customs only”. But be sure to write your name and National Insurance number on the back of the cheque, and don’t fold the cheque. Also include a cover letter which details:

  • your name, address, and phone number
  • your National Insurance number
  • how much you are paying
  • the period you are paying for

Send this letter and cheque to:

HM Revenue and Customs

National Insurance Contributions and Employer Office




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