Also see Pub 590B Ordering Rules
https://www.irs.gov/publications/p590b#en_US_2019_publink1000231071
Ordering Rules for Distributions
If you receive a distribution from your Roth IRA that isn't a qualified distribution, part of it may be taxable. There is a set order in which contributions (including conversion contributions and rollover contributions from qualified retirement plans) and earnings are considered to be distributed from your Roth IRA. For these purposes, disregard the withdrawal of excess contributions and the earnings on them (discussed under What if You Contribute Too Much? in chapter 2 of Pub. 590-A). Order the distributions as follows.
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Regular contributions.
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Conversion and rollover contributions, on a first-in, first-out basis (generally, total conversions and rollovers from the earliest year first). See Aggregation (grouping and adding) rules, later. Take these conversion and rollover contributions into account as follows:
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Taxable portion (the amount required to be included in gross income because of the conversion or rollover) first, and then the
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Nontaxable portion.
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Earnings on contributions.
Disregard rollover contributions from other Roth IRAs for this purpose.
**Disclaimer: This post is for discussion purposes only and is NOT tax advice. The author takes no responsibility for the accuracy of any information in this post.**
