Signing financial documents during sick leave does not constitute business activity under Polish social security law.

The Supreme Court of Poland allowed the applicant's cassation appeal, overturning the lower court's decision that denied her sick pay. The Social Insurance Institution had revoked benefits because the applicant signed invoices during her medical leave, which the lower courts incorrectly interpreted as continuing her business operations. The court ruled that merely signing documents prepared by others, without performing specific business-related tasks, does not qualify as conducting business activity under Article 18 of the Social Benefits Act.