HMRC Online Services is a suite of online tools and services provided by HM Revenue and Customs (HMRC) in the United Kingdom for individuals, businesses, and other organizations. HMRC Online Services allows users to access their tax information, file their tax returns, pay their taxes, and manage their tax affairs online.

To use HMRC Online Services, you will need to create a Government Gateway account. This account will allow you to access a range of online services HMRC provides, including Self Assessment, VAT, and other services.

Once you have an account, you can log in to HMRC Online Services to view your tax information, file your tax return, make payments, and access a range of other services. You can also use the service to update your personal details, such as your address or bank details, and to report any changes to your circumstances that may affect your tax liability.

HMRC Online Services is a convenient way to manage your tax affairs and access a range of information and services provided by HMRC. You can contact HMRC for assistance if you have any questions or need help with the service.