Can I work in other EU countries on an Estonian ICT permit?

A holder of a valid Estonian ICT permit can work at entities of the same corporate group in other EU member states. Short-term mobility of up to 90 days within any 180-day period is generally lighter on formalities, while longer mobility (over 90 days) typically requires notification to, or authorisation from, the destination country. This intra-EU mobility is a distinctive feature of the ICT permit, but the exact procedure depends on the second member state's rules.