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Why would I have a negative amount on line 21, Form 1040?

If you carried forward Net Operating Loss (NOL) from a previous tax year, you want to list your NOL deduction as a negative figure on the “Other income” line of Form 1040 or Form 1040NR (line 21 for 2017).

In other words, in Credit Karma Tax you would enter the prior year NOL as a negative amount. If your NOL deduction exceeds the listed income that is flowing to 1040 line 21, you could have a negative amount to enter on line 21. Learn more about NOL in IRS Publication 536.

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