Changes in issuing invoices for UW data from February 1, 2026

04 02 2026

From February 1, 2026, the University of Warsaw is required to receive invoices using KSeF (the National e-Invoice System).

If a supplier issues an invoice in KSeF, the University will be obliged to download such a document from the system.

In order for your purchases from the ZSD UW budget (I, II, and III pillars) to be paid on time, you must ensure that you comply with the new formalities.

For each order/purchase, you must provide the following information:

• IDWew: 5250011266-30407
• email: faktura.d304@uw.edu.pl

Where to enter this information?

Make sure that the contractor enters it directly on the invoice in the KSeF system.

The suggested fields in the XML file are:

• “Entity3”
• “Additional description”
• ‘Footer’
• “L2-address (entity2)”
• “Name (entity2)”

This information must be included in the contract, order, purchase order, and correspondence at the stage of ordering goods and services!