Earlier quoted context omitted.
Adding a data point with Mexico: All invoices are digital. Every person who gets a TaxId also gets a Private/Public keypair and generating invoices means signing the document with that key. The amazing thing is that now accountants talk about the XML, which is the legal representation of the invoice. As a result, every year if you file your taxes, you go I to the government freely provided website , get into your acc…
What you have just said has thrown me into a tizz trying to understand what you have said. Could you please give a bit more practical details. Say I want to claim rent/transport/medical expenses. Will doctors, car rental place and landlords all issue me an electronic receipt?
When that happens they ask you for your TAX ID and then the business generates the invoice and your taxid and their taxid makes the tie. The Mexican IRS systems see all of this. So at the tax reporting moment, the system will have all that info.
It is pretty neat actually. However I think it is possible bc in Mexico people are not that concerned with privacy and all that.