If you are a US tax exempt organization, please DO NOT PURCHASE ON THIS SITE.

Sales Tax Requirement
Trillium courses are hosted on a platform called Teachable. We use the Teachable payments system to manage payments and taxes. As the vendor on record, Teachable collects, remits, and reports all sales taxes to the relevant authorities worldwide. All purchases made on this site are subject to sales tax collection. Learn more here:
 US sales taxEU/UK VAT tax, and outside of the US/EU.

US Tax-Exempt Buyers
To avoid paying sales tax, exempt US organization must complete our tax exempt application. Please use the button below to fill out the form and we will send you an alternative way to pay for your courses. Note: We cannot offer an alternative way to pay for monthly subscriptions.
If you have already been approved as a tax exempt buyer, you do not need to submit the application again. Please proceed to the Tax Exempt Site and log in with the credentials you were provided and place your order.
Purchase Orders from School Districts
If you need a quote or an invoice in order to use funds from a school district, please use the button below to fill out the PO form. Please complete the form each time you need to place a purchase order.


Q: How can I get the tax removed from my order?

A: If you accidentally made a purchase on this site instead of using the tax exempt site, please complete the form above and then contact [email protected] within 7 days to let us know that you need to cancel your order from the site. We will refund your purchase and get you set up with an account on the tax exempt site.

If you miss the 7 day refund window, you will need to contact Teachable directly to request that your tax be refunded. Please submit a refund request to [email protected]. The refund request should include

  • a copy of the purchase receipt showing the sales tax paid and Order ID
  • a copy of your state sales tax exemption certificate.
  • the name and email of the purchaser

Teachable will issue a refund once the documentation has been reviewed and approved. Usually the process takes about 7 days.

Q: How do I find out if I am supposed to fill out one of these forms?
A: Most buyers, including non-US based buyers, will not need to fill out these forms.

You do need to complete the forms if you are buying on behalf of a US tax-exempt organization. If you do not have documentation of your exempt status from your state, you are not eligible.