Hi concierge,
In addition to RenjolynC's answer, you'll pay per QuickBooks Online company. If you have two companies, you'll be billed for the two even if they are using the same EIN. On the other hand, QuickBooks Desktop is paid per software, not per company you create.
In your case, you might want to consider using the desktop version instead.
Feel free to post again if you have other questions.
