According to EU law conference tickets are subject of 22 % VAT (Council Directive 2006/112/EC of 28 November 2006 on the common system of value added tax: http://data.europa.eu/eli/dir/2006/112/2022-07-01). However, VAT can be refunded: If tickets are bought by an entity with an EU tax number, VAT can be refunded via tax office of the respective EU member country; If tickets are bought by an entity from non-EU countries, VAT can be refunded following the instructions on Slovenian Tax Portal > VAT refund to taxable persons established in a non-EU Member State. And please, consult your accountant, she/he is the true tax wizard.