The only tax Ink Supply.com adds to an invoice is Michigan Sales Tax. If you are not a resident of Michigan, there is no sales tax added to your order.
On Foreign orders Ink Supply.com does not add Duty, VAT or GST to the invoice. This is your responsibility. Each country is different.
On Foreign orders, when using a carrier other than the Post Office there will normally be brokerage fees in addition to the tax and duty. This is your responsibility.