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Questions regarding the "Commercial profit" form on taxx.lu.
Can I use taxx.lu as a self-employed person?
Yes, you can use taxx.lu as a self-employed person.
Where should the benefits of a photovoltaic installation be indicated?
First of all, you must fill in Form 121: https://impotsdirects.public.lu/dam-assets/fr/formulaires/entreprises_annexes/2020/121F-2020.pdf In the "Tax sitatuation" form, tick "Our household realized a commercial profit" and save. A new form "Commercial profit" will appear and you will have to tick "Do you have to report miscellaneous business profits?" Then add the amounts obtained in Form 121.