How is the rate calculated? Natasha Updated August 03, 2023 14:15 Follow Our system looks at your customer address and charges the appropriate tax based on the province. Related articles What is ATD’s attendance policy, and what should I do if I need to miss time from my program? What services are available for individuals with special needs and requests? Are there special national ATD membership rates for chapter leaders? What payment methods do you offer? How do I become a facilitator for ATD education programs?