We gave this matter serious thought. With so many countries having their own sales, value added, state and consumer taxes, and being in a competitive landscape, we suggest it is best to set a final selling price for your applications globally and have sales taxes deducted where applicable.
$10 including sales taxes set as final price, selling in x EU country (e.g 17.5% VAT) equates to your actual selling price excluding VAT as $8.51 (formula: $10/1.175)
This sales tax is not related to any income tax or possible withholds from the US tax office.
An important part of our offering, is that we handle the sales tax issues on behalf of you (the developer) and there will be no further sales tax declarations required from your side in the US & EU, since we handle the submissions including WA state sales tax & VAT in all EU member states.
Sales Tax Rates
21.00% Czech Republic
20.00% United Kingdom
9.50% WA, USA