If you are in the EU, not at all. Sweden is an EU company, and any EU registered company is considered an intra-community operator - you can buy and sell goods without any VAT between EU registered companies.
Because of my work I constantly deal with EU companies and I can guarantee you that there is no VAT in anything I buy/sell in the EU. In fact, my KNC miners have 0% VAT on the invoice.
That is simply not true. You always have to pay VAT in the EU. As to when, that strongly depends on certain factors. Consumers do it immediately, small businessses (in Germany) have to pay until the 10th of the next month and big companies do it at the end of the year.