If your BMO TurboTax Discount link brings you to Online version, this means your 20% discount is offered only on TurboTax Online product. Third parties discount are decided by the companies that offering it to their employees or customers. You will have to verify with BMO if they offer any other kind of discount for TurboTax products.
At the moment, we don't offer any discount on TurboTax Desktop and normally, it is send by email, randomly, by our marketing department.
Thanks for choosing TurboTax.
