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E-invoicing
Archiving
VAT rules

E-invoicing

What is the invoicing mandate? What is a billing mandate and why do I need to sign one? What does the "Signed PDF" e-invoicing mode mean? What dematerialization method does an “unsigned PDF” correspond to? What are the dematerialization methods available in the SY portal? My client offers to digitise my invoices in PDF or signed PDF. How and when should I choose?

Archiving

What is SY archival? Does SY offer an electronic safe? How long are documents stored on SY? How long are invoices stored on SY? Where is the data stored by SY hosted? I no longer wish to use SY. How can I retrieve all my invoices?

VAT rules

What are the regulations for tax digitisation? Should I keep paper invoices? If I send an invoice through SY, do I also have to send a paper invoice by post? Are invoices sent on SY legally recognized? Are my invoices sent via SY legally recognised by the tax authorities? How can the tax authorities access my invoices in the event of an audit?

Frequently asked questions