Michael

Hi. I don't complete a self assessment return, so my UK bank interest should be reported to HMRC by the banks. Do I need to provide HMRC with details of UK bank interest that has not been reported to HMRC by the banks? If so, how long should I wait after the end of the tax year, before contacting HMRC to do so? ie how long after the end of the tax year are UK banks allowed to take to provide the info to HMRC? This year I waited until early October 2023 to call HMRC. Bank interest was missing from my records for 3 of my accounts for 2022/23 so I provided the missing interest figures and HMRC's tax calculation was then correct. But a week later HMRC issued a revised tax calculation with interest from one account doubled: the bank provided the missing interest figure in the meantime, which HMRC had added to my figure, duplicating the interest from that account in my records. I had to queue on the phone to HMRC for an hour to get the duplicated figure removed. In future, should I just avoid providing any UK bank interest information to HMRC and rely on the UK banks to report any interest they pay, even if they are very late in doing so? Is that how the system is supposed to work? None of the people i speak to at HMRC can ever seem to answer this question.