Just to add, regarding the "single tax return": In Finland many of the remaining have-to-input-manually things (e.g. kotitalousvähennys, tax credit for househol

Just to add, regarding the "single tax return": In Finland many of the remaining have-to-input-manually things (e.g. kotitalousvähennys, tax credit for household expenses) can be reported on the tax web portal at any time.