I'm not sure about the code, but the extra amount could very well be penalties for not paying taxes throughout the year. You can verify on line 38 on your form 1040 or see it on your federal tax summary. You can view these by:
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"Tax Tools" in the left hand menu
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"Tools"
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"View Tax Summary" in the main screen
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"Preview my 1040" in the left hand menu or "Federal Tax Summary"
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