Long Ting Chan

To HMRC admin I came to uk with bno visa from hong kong, I haven't been working for couple years and I am currently unemployed, I have gain approximately £90 saving interst a whole year from my hong kong bank account and that's the only foreign income i have, do I need to do the self assessment tax return? I have already done the self assessment tax return check on the government website and the results said that I don't need to, but I have been told that as long as I have foreign income I have to do one Best regards