According to the schedule presented last August AFIP had announced that all monotributistas they must start issuing their invoices electronic system.
Those who started it for the first time (since October) were category "E" classes. now, Saturday 1 December 2018, it will be all category "D".
An electronic perspective is indispensable in all classes.
AFIP, on its website which explains step by step Providing an electronic invoice.
Because when they give electronic invoices to other classes
Class C monotributors: From 1 February 2019.
Class B monotributors: From 1 March 2019.
Class A Monotributors: April 1, 2019.
Functions to be performed end-users the obligation applies From 1 April 2019, regardless of category that the subject was related to Monotributo.
Here are the companies that have to decide by invoice tax or electronic invoice.