How to generate an i.SAF XML file from invoices

What i.SAF is, what the file must contain and how to produce a valid XML for VMI i.MAS without manual entry.

i.SAF is the VAT invoice register that VAT payers in Lithuania submit to the tax authority (VMI) through the i.MAS system, as an XML file with separate purchase and sales registers. Here is how to produce a valid file without manual entry.

Steps

1. Collect the period invoices, both purchases and sales.
2. Upload them to scan123.lt (one by one or as a ZIP).
3. The system reads the details and verifies codes against Registrų centras and VIES.
4. Choose the i.SAF export. You get an i.SAF XML with the correct period structure.
5. Upload the XML to the VMI i.MAS i.SAF subsystem.

What makes a file valid

The file must cover the full reporting period (usually a month), purchases and sales must be separated, and the company details must match the registry. scan123.lt sets the period range automatically and separates purchases from sales, so the file meets i.MAS requirements. See also invoice OCR for Lithuania.