It’s almost surely state and/or local refunds that were automatically brought over with your other tax info, if you transferred your last year’s tax data over to this year's return.
To see your return as it is now, which should include this $340 in income:
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Open or continue your return.
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Select Tax Tools in the left menu (if this isn’t on your screen, select the menu icon in the upper-left corner).
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With the Tax Tools menu open, you can:
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View the entire return: Select Print Center and then Print, Save, or Preview This Year's Return (you may be asked to register or pay first).
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View only Form 1040: Select Tools. Next, select View Tax Summary in the pop-up, then Preview my 1040 in the left menu.
