You must also be qualified for a deductible contribution.

I am qualified and when I put the deduction in the field before dec 31, turbotax lets me take the credit, but if I put it in the field Jan 1 2017 - 4/17/2017 , it does not let me take the deduction. I don't understand. It must be a bug.

Do you have entries in both fields? Ex: Total 2016 contribution is 4000 and the portion of the above contribution is also 4000.

*portion that is btw 1/1/17 - 4/18/17 is also 4000

Yes - I did

Contact live help. They can share your desktop, to 'see' what else might be preventing the deduction.  <a rel="nofollow" target="_blank" href="https://ttlc.intuit.com/questions/1899263-what-is-the-turbotax-phone-number">https://ttlc.intuit.com...>