Guides· 6 min.
Italy's Semi-Annual AD-1 Declaration 2026: Deadlines, Monthly Payments and Filing Guide
From 2026 the AD-1 declaration is semi-annual: H1 (January-June) by 30 September, H2 (July-December) by 31 March. Guide to new deadlines, monthly down-payments and transitional rules under D.Lgs. 43/2025.