Kate12NJ, if you need more information, please start a new thread by asking a separate question rather than add to this already too-long old thread. Generally, though, unless your traditional IRAs have not gained in value over the years or your 2018 taxable income was zero before adding the Roth conversion, it's likely that you prepared your 2018 Form 8606 incorrectly, perhaps by inappropriately omitting your 2018 year-end balance in traditional IRAs, resulting in an incorrectly low taxable amount being calculated on the 2018 Form 1099-R, and you need to amend your 2018 tax return. (You already need to amend your 2018 tax return to add the omitted traditional IRA contribution.) If so, your 2019 tax return is also incorrect, showing a lower-than-correct taxable amount because the basis in nondeductible traditional IRA contributions that transferred from your 2018 tax file was higher than actual.
