GSTIN vs CIN

GSTIN (Goods and Services Tax Identification Number) and CIN (Corporate Identification Number) serve different regulatory purposes and are issued by different authorities under different Acts. GSTIN is a 15-character alphanumeric number (e.g., 27AABCS1234Z1AA) issued under the CGST Act, 2017 by the GST portal — every business registered under GST has a GSTIN specific to each state of registration. It is mandatory for collecting and remitting GST on supplies, claiming input tax credit, and filing GST returns (GSTR-1, GSTR-3B, annual return). CIN is a 21-character alphanumeric number (e.g., L67100MH2010PTC123456) issued by the Registrar of Companies (MCA) under the Companies Act — it uniquely identifies a company in all ROC filings, financial statements, and government communications. Every company (public or private) must display its CIN on invoices, letterheads, websites, and official communications. Key difference: a company needs both — a CIN from MCA (for company law compliance) and a GSTIN from each states GST department (for indirect tax compliance). Foreign companies operating in India also obtain CIN through MCA registration.