tax invoice and invoice

taxajit.31@gmail.com (52 Points)

10 July 2017  
dear expert
my query is that under gst only tax invoice are issue if purchase are registered or not. if person are not registered then which invoice are issue .
tax invoice or only invoice (B to C)
in b to b transaction issue tax invoice and also issuesin case of b to c person.

Pl clarify and advice..