UK here - the forms are here: https://www.gov.uk/self-assessment-forms-and-helpsheets https://www.gov.uk/self-assessment-forms-and-helpsheets Unless you have a

UK here - the forms are here: https://www.gov.uk/self-assessment-forms-and-helpsheets https://www.gov.uk/self-assessment-forms-and-helpsheets Unless you have a very special circumstance (e.g. you're a Lloyds of London name) you can file online through the HMRC website which does all of the calculations for you and is mostly just a case of entering a few figures from your P60 and P11D for the vast majority of people.