In 2017 and 2018 I made non-deductible Traditional IRA contributions. I filed a Form 8606 with my 2017 return. In 2018, I did a backdoor Roth conversion of the combined contributions from 2017 and 2018, this generated a 1099-R in 2018.
Now in preparing my 2018 return, the IRA basis from the 2017 Form 8606 is not being subtracted from the backdoor Roth conversion distribution, meaning that I have taxable income. The 2018 non-deductible Traditional IRA contribution is being subtracted, but this is only half the total amount.
Is this a bug in TurboTax? I am not expecting to pay tax on these after-tax, non-deductible contributions. I have tried deleting the 1099-R and adding it back in, no effect.
Any help is much appreciated.