If you're based outside of the Czech Republic, you’re liable from your first sale. For businesses based in the Czech Republic, sales exceeding CZK 1,000,000 are liable for sales tax.
Yes. You owe tax for the sale of cloud software subscriptions to customers in Czech Republic.
Yes. You owe tax for the sale of software downloads to customers in Czech Republic.
Yes. You owe tax for the sale of eBooks to customers in Czech Republic.
Yes. You owe tax for the sale of digital downloads to customers in Czech Republic.