Conclusion: As per provisions of 408(e)(1), if an IRA or any prevailing pension plan invests in active business or certain real estate then the income becomes unrelated business taxable income (UBTI). As per provisions of Ltr. Rul. 9703026, the IRS held that if a pension plan has invested in a partnership that was involved in an active trade or business or certain real estate, the partnership income would also be UBTI .Can you show me where you find these