Tax on savings when retired

I have a state pension and private pension which exceed my personnel allowance. I now have savings that are providing an additional income from building societies and banks. Do I have to do a self assessment for interest received or is the HMRC automatically informed at end of year.

Hi,

If your savings income is less than £10,000, you do not need to complete a Self Assessment return to declare this. Interest from savings will be automatically declared to HMRC by your banks and building societies following the end of the tax year.
You can read more at:

Tax on savings interest

Thank you.