I have a similar issue. I contributed to a non-deductible traditional IRA for year 2018 in Dec 2018, and did a conversion to Roth for this contribution in Jan 2019. How do I provide this information (that this is a conversion for a non-deductible IRA contribution made in 2018, that the tax was already paid in 2018, so no need to pay the tax on it in 2019, even though it is a distribution in 2019).
