On the Motley Fool and Seeking Alpha and other forums I've seen postings which imply that UBTI and recaptured depreciation are synonymous. This has been in connection with owning MLPs in an IRA.
The idea expressed is that if you hold your MLP for several years in an IRA, even if there is negative UBTI on line 20V every year, you will owe UBTI because the recaptured depreciation transforms into UBTI upon sale.
I understand that if you sold it in a non-IRA the recaptured depreciation should be taxed as ordinary income rather than as a capital gain--but why would it be taxed at all in an IRA unless you transferred it out of your IRA into a non-IRA account or sold it and took out the money?
Is this transformation of depreciation into UBTI in an IRA correct? If so, how does the IRA custodian know how much UBTI to report.