If you need to pay your self assessment income tax to HMRC online please click on the link below:
Debit/Credit Card Payment:
https://www.tax.service.gov.uk/pay-online/self-assessment
Use your 10-digit Unique Taxpayer Reference (UTR) followed by the letter ‘K’ as your payment reference. You’ll find it on the payslip HMRC sent you or call us and we will give this to you.