Key legal question
Whether rental income from the property was subject to AHV contributions as income from self-employed activity.
Extracted holding
The rental income remained contribution-liable because the property was still part of business assets and no legal transfer into private assets had occurred.
Extracted reasoning
After business cessation, the taxpayer had opted not to settle hidden reserves on the property; under the parallelism between tax and AHV law, this choice means the property remains business property for AHV purposes until an actual privatization occurs. Current returns from such property are therefore still contribution-liable.