In 2018 I had to take an RMD from my IRA. Is there any way to determine if a portion of that RMD was from federal or state tax exempt investments?

[TomD8 · Accepted solution]

It doesn't matter.  IRA withdrawals are taxed at ordinary income rates, regardless of the type of investments in the IRA.  That's why there is little or no advantage to holding tax-exempt investments in an IRA.  This website gives a more detailed discussion:  https://www.fool.com/investing/general/2015/02/24/2-investments-to-avoid-in-your-ira.aspx