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Distributions from your traditional IRA may be fully or partly taxable, depending on whether your IRA includes any nondeductible contributions.
If your traditional IRA includes nondeductible contributions and you received a distribution from it in 2015, you must use Form 8606 to figure how much of your 2015 IRA distribution is tax free.
We should allocate distribution between taxable and nontaxable parts ,
but we may NOT allocate distribution to nondeductible contributions first.
Sorry if you expected differently.
While the above is correct for federal tax purposes -
because you are from MA - for MA tax purposes, the IRA distributions are fully exempt from tax as MA doesn't allow IRA deductions.
Let me know if you need any help with reporting.