For a premium account, we can only issue a receipt for you. If you really need an invoice, I suggest you sign up for Todoist for Business account. It's the same price and has team management features.
Ok but what with features? Are the same?
Check out this comparison chart: https://todoist.com/business/pricing
Short answer; yes :-)
Thomas's answer is correct. They basically have the same features though Business has technically more (team management).