Am I able to enter the amount due to the state for our 2015 taxes? If so, where?

[JohnR1 · Accepted solution]

Yes - if you can itemize your deductions, you can claim an itemized deduction for state and local taxes paid in 2016, including those 2015 state taxes you paid in 2016, on Schedule A Line 5a of your federal return

To see where to enter those 2015 state taxes paid in 2016 into Turbotax, please see the following TurboTax FAQ, "Can I deduct taxes I paid for a prior tax year?":

https://ttlc.intuit.com/replies/3302371