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E-invoicing
Archiving
VAT rules

E-invoicing

What is the invoicing mandate? I have been asked to sign a mandate. Why? What does the "Signed PDF" e-invoicing mode mean? What does the "Unsigned PDF" e-invoicing mode mean? Which e-invoicing mode should I choose? 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 want to use the SY portal. How can I implement reversibility to recover my bills?

VAT rules

What are the regulations for tax digitisation? If I send an invoice to my client on SY, do I have to keep a paper copy of the invoice? If I send an invoice through SY, do I also have to send a paper invoice by post? Does sending through SY guarantee that my invoices are legally compliant? Are my invoices sent via SY legally recognised by the tax authorities? How can the tax authorities access my invoices if there is an audit?

Frequently asked questions