Hi Rachel Dance,
As long as you have confirmed with DWP that you will benefit from paying for a particular tax year. If you are still unable to get through to an advisor at HMRC for your18 digit reference number, you can then send HMRC your payment by cheque, without an 18 digit reference number.
Please see the following information on how to pay by cheque.
By cheque through the post
You can pay by sending a cheque to:
HM Revenue and Customs
National Insurance Contributions and Employer Office
BX9 1AN
Allow 3 working days for your payment to reach HMRC.
What to include
Make your cheque payable to ‘HM Revenue and Customs only’.
Write your Class 3 National Insurance reference number on the back of the cheque. You’ll find this on your payslip.
Include the payslip HMRC sent you. Do not fold your HMRC payslip or cheque, or fasten them together.
If you want a receipt, include a note asking for one.
If you do not have an HMRC payslip
Include a note with:
- your name, address and phone number
- your Class 3 National Insurance contributions reference number (or National Insurance number)
- how much you’re paying
- the period you’re paying for
You can find further information on how to pay voluntary Class 3 National Insurance here:
Pay voluntary Class 3 National Insurance
Thank you