The deadlines for paying your self-assessment tax are:

31 January – for any tax you owe for the previous tax year (known as your balancing payment) and your first payment on account (if applicable)

31 July for your second payment on account (if applicable)

Payment details:
HM Revenue & Customs Cumbernauld
Sort code: 08-32-10​
Account number: 12001039
Reference: (Your 10 digit unique Taxpayer Reference (UTR) number followed by the letter ‘K’)