MLPs: K-1 Headache, UBTI, and Why Your IRA Should Avoid Them

The Yield Class Most Investors Should Skip

Master Limited Partnerships (MLPs) are publicly-traded partnerships that own and operate energy infrastructure — pipelines, storage facilities, processing plants. They pay yields of 5-8% reliably and have meaningful tax advantages in the right account. They also have one of the most aggravating tax-paperwork structures in all of finance, and they should generally never be held inside an IRA.

This lesson covers what MLPs are, why they yield what they yield, the K-1 issue, and the ways to get MLP-like exposure without the headaches.

What MLPs Are

An MLP is structured as a limited partnership rather than a corporation. There is no corporate-level tax. Instead, all income, deductions, and depreciation pass through to the unit holders (you). Each year, MLPs send their investors a K-1 form (rather than a 1099) showing their proportional share of the partnership’s tax items.

Most MLPs are in midstream energy — they own the pipelines, storage tanks, and processing plants that move oil, natural gas, and refined products around the country. Big names: Enterprise Products Partners (EPD), Energy Transfer (ET), MPLX, Plains All American (PAA). Yields are typically 6-9%.

Why the Yield Looks So High Tax-Efficient

The magic of MLPs in a taxable account: most of the cash distribution you receive is classified as Return of Capital (ROC), not taxable income. Pipelines have huge depreciation expenses that pass through to unit holders, often offsetting most or all of the cash distribution for tax purposes.

The cash arrives in your account. Your tax bill is small to zero in the year you receive it. Instead, your cost basis is reduced by the ROC amount. When you eventually sell, you pay capital gains tax on the difference between your sale price and your reduced basis.

Translation: you get a big tax deferral. If you hold for many years, your ROC can exceed your original basis, at which point further ROC starts being taxed as capital gain. If you hold until death, your heirs get a step-up in basis and the deferred tax can disappear entirely.

KEY CONCEPT

The MLP tax advantage is real but conditional: it works only in taxable accounts for investors willing to deal with K-1 paperwork and willing to track basis carefully over many years. In an IRA, the structure backfires (UBIT issue, covered below). For most retail investors, the headache outweighs the benefit, and there are simpler MLP-exposure alternatives.

The K-1 Problem

K-1 forms are partnership tax statements. They are different from 1099s in three painful ways:

1. They arrive late. Most K-1s do not arrive until late February or March, often after you would have liked to file taxes. Many MLP investors must file extensions every year just to wait for K-1s.

2. They require state filings. An MLP that operates pipelines in 15 states technically generates partnership income in those 15 states. Strictly, you owe state tax filings in any state where your share of the partnership’s income exceeds the filing threshold. In practice, most retail investors only file where the income is large, but the technicality is real.

3. They cost more in CPA fees. A typical CPA charges an extra $50-150 to handle a single K-1. Hold five MLPs and your tax preparation got several hundred dollars more expensive every year.

If you are a DIY filer with simple TurboTax, K-1s also significantly raise the complexity of your return.

The UBTI/UBIT Problem in IRAs

This is the single most important thing to know about MLPs in retirement accounts: do not hold them in an IRA.

MLPs generate Unrelated Business Taxable Income (UBTI). When UBTI in an IRA exceeds $1,000 in a year, the IRA itself owes tax (called UBIT, Unrelated Business Income Tax). This tax must be filed via Form 990-T, paid out of the IRA’s assets, and partially defeats the entire point of the tax-sheltered account.

To make it worse, the IRA also loses the K-1 depreciation tax-shielding advantage that makes MLPs attractive in the first place. So you are paying tax on income you would normally have deferred.

The simple rule: MLPs go in taxable accounts only. Never IRAs. Never 401(k)s.

COMMON MISTAKE

Investors see a “high-yield income product” and assume the right home is the IRA (because IRAs shelter ordinary income). With MLPs, this is exactly backward. The K-1 structure that makes MLPs efficient in taxable accounts becomes a tax problem inside the IRA. UBIT can apply, the depreciation pass-through is lost, and the form 990-T filing requirement is a real burden. Always taxable, never IRA.

The Workaround: MLP ETFs

For investors who want pipeline exposure without K-1 paperwork or UBIT issues, several ETFs hold MLPs but issue 1099s instead of K-1s:

• AMLP (Alerian MLP ETF) — the largest. Yields 7-8%. Issues 1099. Can be held in IRAs without UBIT.
• MLPA (Global X MLP ETF) — similar to AMLP, slightly lower fees.
• MLPX (Global X MLP & Energy Infrastructure) — broader, includes some non-MLP energy infrastructure.
• EMLP (First Trust North American Energy Infrastructure) — actively managed, broader holdings.

The trade-off: these funds are structured as C-corporations to avoid the partnership pass-through complexity. That means they pay corporate-level tax on the underlying MLP distributions, which slightly reduces the yield compared to holding MLPs directly. But the simplicity is worth it for most investors. AMLP yields about 7-8% in 2024, slightly less than holding the underlying MLPs but with no K-1 hassle.

The Energy-Sector Risk

MLPs are concentrated in midstream energy. Even though they make money on volumes (not prices), they are not immune to energy-cycle stress. The 2014-2016 energy bust crushed many MLPs that had over-leveraged and over-built. Several cut distributions or eliminated them. Kinder Morgan famously cut its dividend 75% in late 2015.

The 2020 oil crash temporarily caused even more pain. Many MLPs traded at fire-sale prices during the worst of it. Most of the high-quality midstream names recovered and many have grown distributions since. But the cycle risk is real.

For diversification, MLPs and AMLP-style ETFs should not exceed 5-10% of an income portfolio. They are concentrated bets, even with diversification within the sector.

GOLDEN INSIGHT

For most income investors, the right MLP exposure is 0% directly, 5-10% via AMLP or MLPX inside an IRA. You get the yield (7%+), avoid K-1 hassles, can hold inside tax-sheltered accounts without UBIT, and accept the small efficiency loss to the C-corp wrapper. The minority of investors who want maximum tax efficiency and are willing to deal with K-1s can hold individual MLPs in taxable accounts — but it is a more involved commitment than most realize.

What to Take Forward

1. MLPs are partnerships in midstream energy infrastructure. They yield 6-9% and have unique tax advantages in taxable accounts.

2. K-1 paperwork is real and costly: late arrivals, state filings, CPA fees, complexity.

3. MLPs in IRAs trigger UBIT above $1,000/year and lose the depreciation pass-through. Never hold direct MLPs in IRAs.

4. AMLP and similar ETFs offer MLP-like exposure with 1099 reporting, suitable for IRAs. Slightly lower yield is the tradeoff for simplicity.

5. Cap MLP exposure at 5-10% of an income portfolio due to sector concentration in energy.

Test Your Understanding

You hold three MLPs in your Traditional IRA, and the combined distributions come to about $4,000 per year. What is the most likely tax consequence?

MLPs in IRAs trigger Unrelated Business Income Tax (UBIT) when UBTI exceeds $1,000 per year. The IRA must file Form 990-T and pay the tax out of its own assets. The depreciation tax-shielding that makes MLPs efficient in taxable accounts does not pass through to the IRA. The result: a partial defeat of the IRA’s tax shelter combined with K-1 complexity. The simple rule is “MLPs in taxable accounts only.”

What is the main practical advantage of an MLP ETF like AMLP versus holding individual MLPs directly?

The MLP ETFs convert the partnership pass-through into a C-corp structure that issues 1099s. This eliminates K-1 paperwork, allows IRA placement without UBIT, and dramatically simplifies tax reporting. The cost is corporate-level tax on the underlying distributions, which slightly reduces the net yield. For most retail investors, the simplicity is worth the small efficiency loss.