With Special chars, make sure you use a UTF-8 text format. If that doesn't work you could try encoding them as html encoded.
As for the tax, I'm unsure what you mean, it shoudl just be a value that is added to your [COL:11] in the CSV, don;t use any "%" sign, it shoudl be a numeric string value.
As for the tax, I'm unsure what you mean, it shoudl just be a value that is added to your [COL:11] in the CSV, don;t use any "%" sign, it shoudl be a numeric string value.