Holding MLPs in an IRA can trigger Unrelated Business Taxable Income (UBTI). If your total UBTI across all retirement accounts exceeds $1,000 in a year, the IRA custodian must file Form 990-T and pay tax FROM your IRA funds — not from your bank account, from the IRA itself. This is the hidden cost most financial advisors warn about. But the reality is more nuanced than \"never hold MLPs in an IRA.\"
By Lucas Andersen — Last updated April 9, 2026
Unrelated Business Taxable Income (UBTI) is income from a trade or business conducted within a tax-exempt entity. Your IRA is tax-exempt. When your IRA owns MLP units, it becomes a limited partner in an active business — pipelines, processing plants, compression services. The MLP’s ordinary business income flows through the K-1 directly to the IRA as the partner of record.
This is fundamentally different from holding stocks or bonds in an IRA. When you hold Apple stock in your IRA, no business income flows through — Apple is a C-corporation that pays corporate taxes before distributing dividends. But an MLP is a pass-through entity: its business income, losses, depreciation, and deductions all flow directly to the partner (your IRA). Under IRC §511–514, this pass-through business income constitutes UBTI.
Your IRA receives a $1,000 specific deduction under IRC §512(b)(12). If total UBTI from ALL sources across ALL your retirement accounts at the same trustee stays at or below $1,000, no Form 990-T is required and no tax is owed. Above $1,000, the IRA custodian must file Form 990-T.
Critical details: (1) The $1,000 is the SUM across all MLPs in all your retirement accounts (IRA, Roth IRA, SEP, etc.) at the same custodian. Own EPD and ET in the same IRA? Their UBTI stacks. (2) The tax is calculated on Form 990-T at trust tax rates — which hit the top 37% bracket at approximately $15,200 of taxable income (2025 brackets). This is much lower than individual brackets, where 37% doesn’t kick in until $609,350+. (3) The tax is paid FROM your IRA funds, directly reducing your retirement balance. Your custodian does not send you a bill — it deducts the tax from the IRA.
UBTI risk depends on the MLP’s income character (specifically Box 1), not the distribution yield. The matrix below shows approximate risk levels by category and IRA position size for normal operating years.
| Category | $5K | $15K | $30K | $50K |
|---|---|---|---|---|
| Pipeline (EPD, MPLX, WES, PAA) | Likely under | Likely under | Borderline | Borderline |
| Multi-entity (ET) | Likely under | Borderline | Borderline | Likely triggers |
| Fuel distribution (SUN, CAPL) | Likely under | Borderline | Likely triggers | Likely triggers |
| LNG / Terminal (CQP) | Likely under | Borderline | Likely triggers | Likely triggers |
| Royalty (NRP, BSM) | Variable | Variable | Variable | Variable |
| C-corp converted (AM, TRGP, MMP) | None | None | None | None |
Pipeline MLPs often generate negative Box 1 (depreciation exceeds revenue), keeping small-to-moderate positions under $1,000 for years. Fuel distribution and LNG MLPs generate higher positive Box 1, hitting the threshold at smaller position sizes. C-corp converted MLPs issue 1099-DIVs — zero UBTI in any account. Critical caveat: any MLP can spike UBTI in years with asset sales, mergers, or the year you sell your units.
UBTI in an IRA is taxed at trust and estate tax rates, not your individual rate. The compression is dramatic:
| Rate | Trust/IRA | Individual (Single) |
|---|---|---|
| 10% | $0–$3,150 | $0–$11,925 |
| 24% | $3,150–$11,450 | $47,150–$100,525 |
| 35% | $11,450–$15,200 | $243,725–$609,350 |
| 37% | Over $15,200 | Over $609,350 |
An individual doesn’t hit the 37% bracket until $609,350+. Your IRA hits it at $15,200. That means $5,000 of UBTI above the $1,000 deduction ($4,000 taxable) is already in the 24% bracket, and $20,000 of UBTI pushes deep into 37%. The same income in a taxable account at your personal rate might be taxed at 22% or 24%. This bracket compression is why UBTI is so punitive for retirement accounts — even modest amounts of MLP income face marginal rates that individuals wouldn’t reach until their income exceeds half a million dollars.
Filing Form 990-T is the custodian’s responsibility, not yours personally. But it comes with real costs that reduce your retirement balance:
The filing fee matters more than it looks. On a $200 UBTI tax bill, a $300 filing fee means you pay $500 total — effectively 2.5x the actual tax. For small MLP positions where UBTI barely exceeds $1,000, the custodian fee can exceed the tax itself. Both the tax and the fee are paid from IRA funds, directly reducing your retirement balance.
Selling MLP units inside an IRA can generate a massive one-time UBTI event even if routine UBTI never triggered a 990-T in any prior year. When you sell, the final K-1 includes §751 ordinary income from accumulated depreciation recapture — and that entire amount flows as UBTI to the IRA.
Example: You held 200 EPD units in your IRA for 8 years. Every year, Box 1 was negative — UBTI stayed well under $1,000. You never filed a 990-T. Then you sell. The final K-1 shows $3,000 in §751 ordinary income from accumulated depreciation recapture. That $3,000 is UBTI. After the $1,000 deduction, $2,000 is taxable at trust rates — approximately $350–$480 in tax, plus $200–$500 in custodian filing fees. Total cost: $550–$980 on a position that never triggered a 990-T in 8 years of holding.
For CQP with its enormous depreciable LNG asset base, the §751 recapture at sale can be $5,000–$10,000+ — pushing deep into the 37% trust bracket. In a taxable account, the §199A deduction may offset part of the §751 income and you pay at your individual rate (often 22–24%). In an IRA, you lose §199A entirely and pay at trust rates where 37% kicks in at $15,200.
Products like AMLP, MLPA, and similar MLP ETFs/funds hold MLP units at the fund level. They are structured as C-corporations, pay corporate tax on the MLP income internally, and issue 1099-DIVs to shareholders, not K-1s. Result: zero UBTI, zero 990-T filing, zero custodian fees. The trade-off is fund-level corporate tax drag — the fund pays ~21% corporate tax before distributing, reducing your net yield. For IRA-only investors who want midstream exposure, the ETF route may make sense despite this drag, because you avoid both the UBTI tax and the filing costs.
Beyond UBTI, holding MLPs inside a retirement account forfeits three valuable tax benefits that only work in taxable accounts:
Roth IRA + small pipeline MLP position: In a Roth, distributions grow completely tax-free (no tax on withdrawal in retirement). For a small position ($3K–$8K) in a pipeline MLP that consistently generates negative Box 1, UBTI may stay under $1,000 for many years. If it eventually triggers a 990-T, the absolute dollar amount may be small relative to the tax-free compounding benefit you received over years of holding. This is NOT blanket advice — it depends on position size, the specific MLP’s income character, and your holding period. “Consult your tax advisor” is genuine here, not boilerplate.
Bottom line for most investors: Hold MLPs in a taxable account. You get tax-deferred distributions, §199A, suspended loss offsets, and the §1014 step-up at death. Use your IRA for stocks, bonds, and REITs that don’t create K-1s or UBTI. If you specifically want midstream exposure inside a retirement account, use an MLP ETF.