When and how do I extend a Czech Intra-Company Transfer Card?

You can renew the ICT Card during the transfer period as long as you stay within the overall ceiling (3 years for managers/specialists, 1 year for interns). File the extension application no earlier than 120 days before your card expires and no later than its last day of validity.

If you apply on time, you benefit from the 'fiction of residence', meaning you may remain legally in the country while the decision is pending. You will typically submit an updated form, valid travel document, proof of accommodation if it changed, and employer confirmation that the original transfer details still apply.