If you're based outside of Croatia, you’re liable from your first sale. For businesses based in Croatia, sales exceeding HRK 300,000 (~$48,000) are liable for sales tax.
Yes. You owe tax for the sale of cloud software subscriptions to customers in Croatia.
Yes. You owe tax for the sale of software downloads to customers in Croatia.
Yes. You owe tax for the sale of eBooks to customers in Croatia.
Yes. You owe tax for the sale of digital downloads to customers in Croatia.