Get your taxes done using TurboTax

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@joann-harllee wrote:

Where do I go to change the $300 to $600?

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When you are on Final Review after the State return has been completed the program will tell you that there is one item that needs review.  During the review change the $300 to $600 on the From 1040 Line 12b.  After completing this review your return should be able to be filed.  See screenshots.