MLP Stepped-Up Basis at Death: The Hold-Forever Strategy

§1014(a): The Most Powerful Provision in MLP Tax Law

IRC §1014(a) states that the basis of property acquired from a decedent is the fair market value of the property at the date of death (or the alternate valuation date under §2032, if elected). For MLP investors, this single sentence eliminates every dollar of accumulated tax liability — basis erosion, §751 recapture, zero-basis §731 gain — all reset to zero. The heir’s cost basis becomes the closing unit price on the date of death, as if they purchased at market price that day. No gain is recognized. No recapture is triggered. This applies to all partnership interests, including publicly traded partnerships.

What Gets Eliminated: Dollar by Dollar

Consider 1,000 EPD units purchased at $26 ($26,000 cost basis), held for 20 years. At death, EPD trades at $30/unit ($30,000 FMV).

Basis erosion eliminated: Twenty years of distributions at ~$2.10/unit, 75–85% ROC, erode basis from $26,000 to approximately $2,000. The $24,000 gap — which would have been taxable gain on sale — vanishes. Heir’s basis: $30,000. §751 recapture eliminated: Cumulative depreciation allocated over 20 years creates $8,000–$12,000 of §751 “hot asset” ordinary income exposure. At sale, this would be taxed at up to 37%. At death, eliminated entirely. §731 zero-basis gain eliminated: If basis reached zero in year 15, distributions in years 16–20 generated approximately $8,400 of §731(a) capital gain. After the step-up, the heir’s basis resets to $30,000. Distributions are tax-deferred again.

Sell Today vs. Hold Until Death

The following comparison uses 1,000 EPD units: $26,000 original cost, $8,200 IRS-adjusted basis (after 10 years of erosion), $30,000 current FMV.

The heir inherits 1,000 EPD units with a $30,000 stepped-up basis. The $2,400 in suspended passive losses is lost at death — but that loss ($2,400 × ~30% = ~$720 tax value) is minor compared to the $6,670 in taxes eliminated by the step-up.

Suspended Passive Losses at Death: §469(g)(2)

Under §469(g)(2), suspended passive losses on property transferred at death are allowed as a deduction on the decedent’s final return — but only to the extent that the total suspended losses exceed the step-up in basis. If the decedent had $2,400 in suspended PAA losses and the step-up added $21,800 in basis ($30,000 FMV minus $8,200 adjusted), the deductible amount is $0 because the step-up ($21,800) far exceeds the suspended losses ($2,400). In practice, the final-return passive loss deduction is almost always zero for long-held MLP positions because the accumulated step-up dwarfs the suspended losses.

The §743(b) Inside Basis Adjustment

When a partner dies and the interest transfers to an heir, the partnership may make an inside basis adjustment under §743(b) if a §754 election is in effect. Most large MLPs (EPD, ET, MPLX, WES, PAA) have standing §754 elections. The adjustment aligns the partnership’s inside basis (its share of asset values on the books) with the heir’s new stepped-up outside basis. Practically, this means the heir’s future K-1s reflect the new basis: depreciation resets, and the heir begins receiving fresh depreciation deductions against future income allocations. Without the §754 election, the heir’s outside basis steps up but the inside basis does not — creating a mismatch that resolves only at sale.

Community Property Double Step-Up

In the 9 community property states (AZ, CA, ID, LA, NV, NM, TX, WA, WI) plus Alaska and Tennessee (optional community property), when one spouse dies, BOTH halves of community property receive a stepped-up basis — not just the decedent’s half. In common-law states, only the decedent’s 50% steps up. For a married couple holding 2,000 EPD units as community property with $4,000 total adjusted basis and $60,000 FMV: in a community property state, the surviving spouse’s basis resets to $60,000. In a common-law state, only the decedent’s half steps up: $30,000 + $2,000 = $32,000. The community property advantage: $28,000 of additional basis, saving approximately $5,600–$8,400 in future taxes.

Multi-Generational Strategy: Two Generations, $126,000 from $26,000

Generation 1: Buys 1,000 EPD at $26 ($26,000) at age 45. Over 30 years: collects approximately $63,000 in tax-deferred distributions ($2.10/unit × 30 years). Basis erodes to ~$2,000. Suspended passive losses accumulate to ~$4,500. At death (age 75, EPD at $40/unit): heir inherits with $40,000 stepped-up basis. The $24,000 in basis erosion, $18,000 in §751 exposure, and all §731 gains from the zero-basis years are eliminated. The $4,500 in suspended losses produces approximately $0 deduction on the final return (step-up exceeds losses). Generation 2: Starts fresh at $40,000 basis. Collects another ~$63,000 over 30 years. At death (EPD at $55): Generation 3 inherits at $55,000 stepped-up basis. Total across two generations: ~$126,000 in cash distributions from a $26,000 investment. Federal income taxes paid on the distributions: approximately $0 (tax-deferred until step-up eliminates the liability).

Risks and Limitations

Legislative risk: §1014 has been politically targeted multiple times. The Biden 2021 American Families Plan proposed eliminating step-up for gains over $1M. It failed, but future proposals are likely. Conversion risk: MLPs can convert to C-corporations (TRGP in 2024, MMP/ONEOK merger in 2023). Conversion triggers a taxable event and eliminates the partnership step-up mechanic going forward. Distribution risk: Distribution cuts (PAA in 2020, ET in 2020) reduce income but also slow erosion. The step-up strategy works best with consistent distributions. Concentration risk: A hold-forever strategy means permanent energy sector exposure. Estate tax: The step-up eliminates income tax, not estate tax. Estates exceeding the exemption ($13.99M per person in 2025) still owe estate tax on the MLP’s FMV.