Hi Susanne,

Prior to checkout, you will have the option to enter the tax exempt code while the items are in your cart. Below the total you should see the statement, "If you have a tax exempt code, please click here." Once you click on that, enter the code and continue the process to checkout. Once you have completed payment, you may email your tax exemption certificate to our customer care team along with your order number or include it with the documentation that you are submitting to us.