I'm starting to fill out my form 12 but I'm not sure where is the correct place to fill in the details related to tax paid on stock purchased below market value from my employer . Any ideas?
Form 11 is a self assessment return. If your nominal income from discounted share options (or other sources) is above c. €3,175 (?) then Revenue treat you as an assessable person and you go on self assessment for a while after. That might be why they asked you to do a Form 11 rather than Form 12 return. If you are PAYE and not explicitly asked to return a Form 11 then I would stick to Form 12 (with explanatory annotations/attachments if necessary) otherwise things may get confusing.