Your calculation is wrong. UK prices and German prices are quoted VAT-inclusive, so £999 already includes VAT @ 20% and the German figure includes 19% MwSt. £999 is all you'll pay. In the US you will pay an additional amount at the register based on local sales tax, for example in Cupertino you will pay an additional $91 of sales tax bringing your total up to $1,090. Converted to USD the price difference is almost entirely tax (9.125% vs 20% on a $1k purchase).