1065 & 1120-S Deadlines 2026: IRS Mailing Rule, Penalties and Extensions

Tax professional dressed as a USPS mail carrier explaining the IRS mailing rule showing March 16 deadline and the concept “Timely Mailing Equals Timely Filing” for business tax returns.

IRS Penalty Relief 2026 | Guide for Forms 1065 & 1120-S The March 16th deadline has passed. Request penalty relief now to protect your business. El plazo del 16 de marzo ha vencido. Solicite el alivio de multas ahora para proteger su negocio. EN ES ☀️ Action Required Missed the Deadline? How to Request IRS […]