What Is GSTR‑1A?
Understand GSTR-1A for error correction in GSTR-1 before GSTR-3B. Crucial with July 2025 GSTR-3B becoming non-editable.
What is GSTR-1?
Learn what GSTR-1 is, who must file, due dates, penalties, and how OPEN’s Optotax & Zwitch APIs simplify GST return filing for businesses.