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Line 21 on what form? Line 513 on what form? What does "blank refund due" refer to?
Remember that we in the Community cannot see your tax return nor the screen you are on.
1040 line 21 is blank? Why do you think it should have a refund? Is there an amount on line 20? What line is the amount on? Did it get applied to 2020 on line 22? Or do you have a Tax Due on line 23?
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