Any B2B business that is registered under GST with an aggregate turnover of more than  ₹20 Cr is applicable for e-Invoicing. However, from October 1st, 2022, every business with an aggregate turnover over ₹10 Cr from FY 2017-18 to 2021-22 is required to follow the current e-Invoicing guidelines. 

If the turnover in the last FY was below the threshold limit but it crossed the limit in the current year, then e-Invoicing would apply from the beginning of the next financial year.