Where digital services are taxed
Digital services to consumers are taxed where the consumer lives. A German user pays German VAT on your plan, and a French user pays French VAT. Below €10,000 of total cross-border EU consumer sales per year, you may still charge Dutch VAT (21%) on everything. Above that threshold, you switch to each country's rate, which for an international SaaS usually applies from the start.
One return for the other 26 EU countries
With the OSS return, you register once in the Netherlands for your consumer sales to the other 26 EU countries. You file one quarterly return with your sales per country, and the Dutch tax authority passes the money on to each country. For each customer, you keep two items of evidence of their country that agree with each other. Your payment provider collects these. You also issue correct credit notes for refunds, so the VAT on each refund is corrected in your return.
Business customers and the rest of the world
EU businesses with a valid VAT number get an invoice marked VAT-free, reverse charged, with their number shown on it. Sales outside the EU generally fall outside EU VAT. Large markets have their own rules for digital services, so check them once your revenue there increases. If you sell through app stores, the model is different. The platform is usually the seller and handles the consumer VAT, and you invoice the platform.
Pricing and the monthly habit
Set your prices including VAT and let your checkout software apply the rate per country. Otherwise your margin can vary by up to twenty percent between countries. Compare payment-provider reports with the bank every month. With this monthly check, you only need to add up the figures for the OSS return. For the company setup, see micro-SaaS in a Dutch BV (besloten vennootschap, the Dutch private limited company).
A company outside the EU can use these rules through a Dutch partner. See fiscal representation for non-EU importers for what that partner does and how the costs are built up. There you also read when your own Dutch company is the better option.
The VAT return is due every quarter, the payroll every month and the annual accounts once a year. Read more about this work, and how the monthly amount is calculated, on bookkeeping in the Netherlands.
Related questions
See also From Singapore or Hong Kong and Dubai or the Netherlands for your SaaS.