Regulation· 5 min.
AD-1 Declaration Deadlines 2026 in Italy: Semi-Annual Calendar, Down-Payments and Settlement
All AD-1 deadlines for 2026: H1 (January-June) by September 30, H2 (July-December) by March 31, 2027, monthly advance payments by the end of each month on the previous month's quantities. Complete calendar with D.Lgs. 43/2025 and DM 10 March 2026 references.