Why is the taxable amount of a distributions on a 1099R not showing up on line 4b of 1040 as taxable income?

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Why is the taxable amount of a distributions on a 1099R not showing up on line 4b of 1040 as taxable income?

[Jim-from-Ohio · Accepted solution]

basis issue?

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No basis entered anywhere

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Found the basis issue.

Thank you!

[Jim-from-Ohio]

how did you find it?  Form 8606?  curious