If you're based outside of Sweden, you’re liable from your first sale. For businesses based in Sweden, sales exceeding SEK 30,000 (~$3500) are liable for sales tax.
Yes. You owe tax for the sale of cloud software subscriptions to customers in Sweden.
Yes. You owe tax for the sale of software downloads to customers in Sweden.
Yes. You owe tax for the sale of eBooks to customers in Sweden.
Yes. You owe tax for the sale of digital downloads to customers in Sweden.