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I am having a problem with the calculation of VAT on shipping costs. You can set "Including VAT" on a flat rate shipping service. I believe that the VAT percentage that is used is not ok.
I created one VAT rate of 19% (0.19). The vat on my product is calculated correct. My shipping cost is 14.50. The VAT on that should be 2.32, but the calculated value is 1.52. Please check the attached screen shots, these show exactly what I describe here. The first image shows the order when the VAT rate on the shipping is set "Excluding VAT", the other with "Including VAT".
It looks like that the VAT rate that is calculated on the shipping is 11.71%; I have no idea where that comes from. Shouldn't there be a way in the flat rate module where you can set the correct VAT rate?
One last remark. The final order total is correct, it's just that the VAT amount is wrong. This results in incorrect invoices.