• E-invoicing for businesses with aggregate turnover exceeding ₹5 crore will be mandatory from next year. At present, the threshold is ₹20 crore, which is going to come down to ₹10 crore from October 1.
• The system is ready to facilitate e-invoicing for threshold of over ₹10 crore. The effort is to lower the threshold to ₹5 crore from next year for which a notification prescribing the exact date is to be issued later.
• Reduction of the threshold for e-invoicing is a planned effort by the Government targeting towards digitising of maximum transactions and transparency in sales reporting. This would lead to controlling the menace of fake invoicing, check miss-match errors, and improve tax compliances, ultimately improving tax collections.
• It’s important for the industry to either integrate their invoicing systems with the IRPs or provide appropriate training to their executives to generate e-invoices from the Government system manually. Non-generation of e-invoice is not merely a statutory non-compliance but may also lead to loss of business for the SMEs as the large business houses may not accept the non-compliant GST invoices while making payments for goods and services.
• Tax officials say businesses use various accounting/billing software, generating and storing invoices in their electronic formats. These different formats are neither understood by the GST system nor among the systems of suppliers and receivers. 

Source: https://www-thehindubusinessline-com.cdn.ampproject.org/c/s/www.thehindubusinessline.com/economy/e-invoicing-for-businesses-having-turnover-more-than-5-crore-from-next-year/article65934136.ece/amp/