Key legal question
Whether cantonal supplementary benefits under § 18 ZLG could be reduced or refused for lack of need beyond the specific rule in § 19 ZLV.
Extracted holding
Yes. § 18 ZLG is a general need-based reduction clause and is not limited to the case of non-included earnings of non-disabled family members.
Extracted reasoning
The wording 'to the extent not needed for maintenance' supports a broad interpretation. The ordinance does not exhaustively regulate reduction grounds, so the authority may assess need on the concrete circumstances.