PayPal Please, select an option Late fee SIS 2026 Regular fee for SIS and FENStatS members 470,00 € EUR Fee for SIS members whose annual dues are paid up to 2026 450,00 € EUR Fee for junior members and retired Professors (SIS Memebers) 260,00 € EUR Regular fee for NON SIS members (VAT included) 530,00 € EUR