The desktop software to install on your own computer, and the online website, or completely different products. You will need to return the CD to Costco and then pay for the online product when you check out and file. TurboTax customer support might or might not be able to apply the cost of the CD to your online account.
Incidentally, the desktop program is significantly more powerful than the online program and is more cost-effective if you are self-employed or if you have more than one return to prepare.
