
Invoice Numbers Under GST: The 16-Character Limit, Branch Series and GSTR-1 Table 13
A GST invoice number can have up to 16 characters using letters, digits, hyphen and slash, in one or more series, unique within the financial year. How to set series per branch and GSTIN, restart on 1 April, and fill the now-mandatory Table 13 of GSTR-1.


