You're right - after I posted this, I reviewed the 8606s and realized there were some mistakes. It gets even more complicated.
Where I am now: for 2019, I have a basis of $14,300, a contribution of $6000, and a traditional IRA with $18,066.47 funded will all non-deductible contributions. If my current calculations are correct, I can convert the entire amount in 2019 and it will all be non-taxable. The basis is higher because I converted a contribution that was made in the 2016 tax year but in 2017. I also made a contribution in 2018 to the 2017 tax year, but I didn't convert in 2017 (or 2018). So I think I am going to owe some taxes due to that error I made in 2016, but I hope I can still rely on the calculations I've done on each 8606.
If I didn't make that conversion-timing error in 2016, I would have a basis of $11,000 and a contribution of $6000, which means I can't convert the entire amount of the traditional IRA tax-free.
So my question is, what is the correct calculation given that I converted part of my traditional IRA in 2017 that should have been taxable?
