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What shall I put in box 2a?

 

I try three different number, the result are different

1. I put same amount as box 1. I need pay more tax.

2. I put same amount as box 3, the gain. tax refund is same. Then, the TT review shows I can't do e-file  for California, because form 4852 are not eligible for electronic  file. I have print out state tax and mail it.

3, I  leave it empty, the TT review shows error: the box 3 can't greater than box 2a.

 

In 2b, I select taxable amount not determined