When Step-Up Basis Beats a Trust

Your broker shows your EPD position is worth $74,617. The IRS says your basis is $0. If you sell, you owe $18,268 in federal tax — and your broker's 1099-B will understate that by roughly $11,290, because the broker only sees the capital gain and never sees the $40,000 of §751 ordinary income that accumulated inside the K-1s. If you die holding those units, your heirs owe nothing. The basis resets. The §751 recapture disappears. The $18,268 in deferred tax is eliminated.

This is not a loophole. It is §1014(a) of the Internal Revenue Code, and it is the single most powerful estate-planning tool available to MLP investors. Yet most estate attorneys will tell you to put your MLPs in a trust — advice that, for direct MLP holders, can destroy the benefit it was meant to preserve.

I hold direct positions in EPD, ET, MPLX, WES, PAA, and NRP. The strategy I'm about to describe is my own. The numbers in this article were computed by the same IRS Partner's Basis Worksheet engine that powers the MLP Portfolio Tax Simulator, with every value traced to a specific IRC section.

Under §1014(a), the cost basis of inherited property resets to fair market value on the date of death. For most assets this is a modest benefit — a stock that doubled over 20 years gets a step-up equal to its gain. For MLPs, the step-up is proportionally much larger, because the basis doesn't merely stay flat. It erodes every single year.

Follow the EPD position. Purchased: 1,000 units at $37.50, for $37,500. EPD pays roughly $2.20/unit in annual distributions, of which about 80% is classified as return of capital under §733. Each year the ROC portion reduces outside basis. Layer in the taxable K-1 income that adds basis back under §705(a)(1), and the net effect is a slow bleed of about $1,760 per year. The position hits zero adjusted basis in Year 16. The broker still shows $37,500. The IRS knows it's $0. The gap between the two widens every year — and the broker's 1099-B, if you ever sold, would be wrong by exactly that gap plus the §751 layer.

At death, three separate categories of embedded tax liability are eliminated simultaneously:

• Basis erosion. Under §1014(a), the heir's basis is reset to the full $74,617 FMV. The 20-year bleed is completely reversed, as if the decedent had purchased the units on the day they died.
• §751 recapture. The $40,000 of accumulated depreciation allocated through K-1s — which would have been taxed as ordinary income on a lifetime sale — is wiped out. The heir inherits with no embedded hot-asset liability.
• §731 zero-basis gain. EPD's basis hits zero in Year 16. Every distribution after that triggers immediate capital gain recognition under §731. The step-up resets basis to FMV, so distributions once again reduce basis as return of capital — tax-deferred, exactly like Day 1.

Estate attorneys default to trusts because trusts work well for most assets. MLPs are not most assets. The K-1 structure creates specific complications that most estate attorneys have never encountered, because they do not deal with partnership taxation on a regular basis. Here is what changes when an irrevocable trust holds MLP units after death.

• Rate compression. Trusts hit the top federal bracket at roughly $15,000 of income. Individuals don't hit that rate until roughly $580,000. The same $2,200 of taxable MLP income allocated to a trust is taxed at the top marginal rate; allocated to a typical individual beneficiary, it's taxed at a middle bracket. Over a decade of distributions, the difference compounds into thousands of dollars per position.
• UBTI exposure. Under §512, MLPs can generate Unrelated Business Taxable Income inside irrevocable trusts. If the trust's UBTI crosses $1,000 in a year, the trust owes tax on that income — at trust rates, on top of normal distributions.
• Multi-state filings. A trust that holds MLP units must file in every state where the MLP operates. For a position like ET (Energy Transfer), that can mean 40+ state filings. The administrative cost routinely exceeds the tax benefit the trust was set up to capture.
• K-1 processing costs. Expect $500 to $1,500 per year in additional CPA fees to process K-1s inside a trust, per MLP position, depending on how many states the MLP operates in.
• §199A QBI deduction. The 20% deduction on qualified PTP income has different rules for trusts and is often limited or lost entirely at the trust level.

There is a separate, subtler trap: the Intentionally Defective Grantor Trust (IDGT). IDGTs are popular vehicles for transferring wealth out of a taxable estate. But IDGT assets generally do not receive §1014 step-up — they sit outside the gross estate (which is the entire purpose of the IDGT). For MLP holders with deep basis erosion and large §751 accumulation, the lost step-up can cost more than the estate tax the IDGT was designed to avoid. Below the federal exemption ($13.99M per person in 2025), the IDGT is solving a problem you don't have — at the cost of a benefit you can't afford to lose.

Run a concrete 5-MLP portfolio through the engine. Standard position sizes, canonical tax configuration, 20-year horizon, 2 beneficiaries.

Three scenarios, same portfolio, same 20 years.

The point of this comparison is not that trusts are always bad. It is that the default advice — “just put it in a trust” — has a specific, computable cost for MLP holders, and that cost is routinely larger than clients realize. The simulator will compute this for your actual positions.

The hold-forever thesis, stated directly: when basis erodes significantly, the counterintuitive correct response is to buy more units. Fresh basis enters the portfolio alongside the eroded lots. Distribution income increases. At death, everything steps up — old lots, new lots, every lot on the same date-of-death basis reset.

The mathematically optimal strategy for a long-term MLP holder who intends to pass wealth to the next generation is: never sell. Buy more when basis erodes. Collect distributions. Let §1014 handle the rest.

I own MLPs because they are an efficient way to defer taxes and build an asset base I can pass to my children. The math supports this. The IRS code supports this. The only thing working against this strategy is the instinct to do something when doing nothing is the right answer.

Read this the day after a parent dies. It is the single most expensive mistake inheriting families make, and it is almost entirely preventable.

1. Your basis is the closing price on the date of death. Not the broker's number. Not the decedent's original purchase price. Get the date-of-death per-unit closing price from a historical price source, multiply by units held, and document it. If the executor elects the alternate valuation date under §2032, it's the closing price six months after death instead.
2. Call your broker and update the cost basis immediately. Brokers frequently carry forward the decedent's eroded basis to the inherited account instead of resetting to FMV. If you sell with the wrong basis in place, you will overpay federal tax by the full amount of the decedent's erosion — a five-figure mistake on most positions, irrecoverable once the 1099-B is filed.
3. You have zero §751 recapture from the prior owner. The decedent's $40,000 of accumulated depreciation recapture (on a canonical EPD position) is eliminated. You start fresh. If you continue holding, you will accumulate your own §751 exposure from the inheritance date forward — but the prior owner's is gone.
4. You will receive K-1s going forward. If you don't want the K-1 complexity, selling immediately is virtually tax-free. FMV at date of death minus stepped-up basis is approximately $0, so capital gain on sale the next day is approximately $0. Your §751 exposure is zero because the prior owner's was reset and you've accumulated none of your own yet.
5. If you want to continue holding: you inherited a high-yielding position with a clean basis. You are in the same economic position as a new buyer — but without having paid the purchase price.

For the complete 90-day heir's guide — including phone scripts for the broker, basis-reset rescue paths, and day-by-day action items — see The MLP Inheritance Playbook.

If you manage clients who hold direct MLP positions, three questions to ask at the next planning meeting:

1. Do you know your adjusted basis in each MLP position? The broker's number is wrong — sometimes by tens of thousands per position. The K-1 Basis Tracker runs IRS Worksheet Lines 1–14 on the client's actual K-1 history and produces the IRS-adjusted number.
2. Has your estate attorney considered the K-1 implications of your trust structure? Most estate attorneys have not. The trust-rate compression on MLP income alone — independent of UBTI, state filings, and §199A loss — can justify restructuring for direct ownership below the federal exemption.
3. Have you computed the §1014 step-up value across the full MLP portfolio? The Portfolio Simulator's Estate Planning mode shows aggregate tax eliminated at death. For a typical 5-MLP portfolio held 20 years, that number is around $48,535 in deferred tax plus roughly $110,801 in §751 recapture eliminated — larger than most clients expect.

The CPA PDF export produces a report you can hand to a client or attach to a financial plan: every assumption documented, every IRS citation linked, every formula auditable.

Coming soon: What happens to §1014 step-up when you hold US MLPs as a resident of Norway — treaty implications, Norwegian wealth tax interaction, and the US reporting requirements that survive relocation.