To better assist you, can you tell us exactly what is the product you bought: Online or Desktop? And which Edition (example: Deluxe)?
If you bought TurboTax Online, you can activate this code only one time, in one account with this link. Depending on the version of the product purchased (e.g. Deluxe), as long as you haven't upgraded or added extra services such as Revue-Conseil, you won't have to pay anything. On the payment page, you'll be asked if you wish to apply the declaration to the code, but this code cannot be used to reduce the payment amount.
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