<h1>From April 2021, GST taxpayers must use 6-digit HSN codes for turnovers over Rs. 5 crore; 4-digit for others.</h1> From April 1, 2021, GST taxpayers with a turnover exceeding Rs. 5 crore must include a 6-digit HSN Code or SAC on invoices for taxable goods and services. Those with a turnover up to Rs. 5 crore must provide a 4-digit HSN code on B2B invoices. Previously, the requirement was 4 digits and 2 digits, respectively. HSN codes, used universally, align with Customs tariffs and GST purposes. Many taxpayers already voluntarily use 6/8 digit codes on invoices, e-way bills, and GSTR 1 returns. The change aims to standardize and streamline tax documentation processes.