Per Expert DavidD66:
You do not need to report the K-1 you received for an investment you hold/held in a retirement account.
If the investments in your retirement account generated total positive UBTI across all applicable investments held equal to $1,000 or more, then Form 990-T must be filed, and the related tax paid.
Unrelated business taxable income (UBTI) is income earned by a tax-exempt entity, such as an IRA, that is not related to the exempt purpose of the tax-exempt entity. The exempt purpose of an IRA is to provide for the retirement of the IRA holder. More than likely, you didn't have $1,000 or more of UBTI; moreover, if you did, your retirement plan custodian would probably file Form 990-T and pay the tax on your behalf, which would then be a distribution from your account.
If you think you may have had $1,000 or more of UBTI in an account, I suggest you contact the retirement plan custodian about how they deal with it.
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