Questione giuridica chiave
Whether the appellant had to be classified as self-employed rather than non-employed for AHV purposes in 2003 and 2004.
Decisione estratta
The later reclassification was not permissible; the original self-employed assessment for 2003 and 2004 remained binding.
Motivazione estratta
The initial assessment was at least defensible and therefore not 'manifestly incorrect'; the prerequisites for reconsideration or revision were not met, so the authority could not retroactively change the contribution status on the basis of later findings about wealth or hindsight loss.