Why Selling an MLP Isn't Like Selling Stock
When you sell a stock, the math is simple: proceeds minus cost basis equals gain, taxed at capital gains rates. One number, one rate, one line on your tax return.
When you sell MLP units, the math is radically different:
- Your cost basis isn't what you paid — it's been adjusted by years of K-1 activity (income, deductions, distributions). Your broker doesn't know the real number.
- Part of your gain is recharacterized as ordinary income under Section 751 — taxed at up to 37%, not capital gains rates.
- You may have suspended passive losses that are released at sale, offsetting both §751 income and capital gains.
- The stepped-up basis at death eliminates all of these taxes for heirs — creating a strong incentive to never sell.
This framework is ticker-agnostic. To see how the sell-vs-hold call shifts by the MLP you actually own, compare the sell-vs-hold math across tickers.
Warning
The stakes are real. For a 1,000-unit MLP position held for 8+ years, the difference between the optimal sell strategy and a naive sell can be $5,000–$20,000+ in unnecessary taxes. This isn't theoretical — it's the gap between understanding these six factors and ignoring them.
Factor 1: How Far Has Your Basis Eroded?
The first question: what is your IRS-adjusted basis? Not your broker's number — your real, K-1-adjusted basis after years of distributions, income allocations, and deductions.
Every dollar of basis erosion is a dollar of additional taxable gain when you sell. If your original purchase was $20,000 and your adjusted basis is now $8,000, you have $12,000 in embedded gain that doesn't appear on any brokerage statement.
Basis Erosion and Embedded Gain
If current price is $48/unit, the broker says your gain is $4,000. The IRS says it's $16,000. That $12,000 gap is real money that will be taxed.
The implication: The more basis erosion you have, the more expensive it is to sell. Long-term holders with 50–70% basis erosion face enormous embedded gains — and a significant portion will be §751 ordinary income. This is the #1 reason many MLP investors choose to hold indefinitely.
Know your real basis before deciding
The K-1 Basis Tracker calculates your IRS-adjusted basis from your actual K-1 data. See exactly how much basis erosion has accumulated and what the tax consequences of selling would be.
In the K-1 tracker, typing your numbers in uploads nothing; an uploaded K-1 PDF is read by a third-party AI provider. Privacy
Open K-1 Basis TrackerFactor 2: How Much §751 Ordinary Income at Sale?
Section 751 recapture recharacterizes a portion of your gain as ordinary income — taxed at your marginal rate (up to 37%) instead of the preferential long-term capital gains rate (0/15/20%).
For midstream MLPs held 5+ years, §751 typically represents 30–60% of total gain. The exact amount depends on the partnership's accumulated depreciation on physical assets — you won't know the precise number until the Sales Schedule arrives with your final K-1.
The §751 impact on your effective tax rate:
*Assumes 37% marginal rate on §751, 15% LTCG on remainder, before §199A deduction
Key Insight
The §199A offset helps. The Section 199A QBI deduction (made permanent by the One Big Beautiful Bill Act in July 2025) provides a 20% deduction on qualified PTP income, including qualifying §751 ordinary income. This reduces the effective top rate on the §751 portion from 37% to approximately 29.6% for eligible taxpayers. Still painful, but meaningfully better.
Factor 3: Your Suspended Passive Losses
This is the factor most MLP investors overlook — and it's the one that can dramatically change the sell/hold calculus.
During your years of ownership, if your K-1 allocated net losses that were suspended under §469(k) passive activity rules, those losses have been accumulating. You couldn't use them against wages, investment income, or even income from other PTPs. They've been sitting in a locked account, waiting.
Under IRC §469(g), upon complete disposition of a PTP interest, all suspended passive losses are released. They become fully deductible — first against §751 ordinary income, then against capital gains, and any excess becomes a loss against other income.
Suspended Losses Transform the Economics
Without suspended loss release:
Total gain: $16,000
§751 ordinary income: $7,000
Capital gain: $9,000
Tax: $7,000 × 37% + $9,000 × 15% = $3,940
With $5,500 suspended losses released:
§751 after offset: $7,000 − $5,500 = $1,500
Capital gain: $9,000 (unchanged)
Tax: $1,500 × 37% + $9,000 × 15% = $1,905
Savings from suspended losses: $2,035 (52% reduction in tax)
Warning
Critical: partial sales don't release suspended losses. You must sell your entire interest in the PTP to trigger the §469(g) release. Selling 80% of your units while keeping 20% means zero suspended loss release. This creates a strategic tension — you may want to sell all at once rather than gradually, specifically to access the loss release.
Factor 4: The Death Step-Up Option
Under IRC §1014, MLP units inherited by heirs receive a stepped-up basis to fair market value on the date of death. This single provision eliminates:
- All accumulated basis erosion — years of return of capital, gone
- All §751 recapture exposure — the ordinary income component, eliminated
- All embedded capital gains — the heir starts with a clean basis at market value
The downside: suspended passive losses expire unused at death. They cannot transfer to heirs. But for most long-term MLP holders, the value of the step-up far exceeds the value of the lost suspended losses. For the hold side of this decision, see what holding an MLP for 20 years actually looks like, year by year.
Hold Forever vs. Sell Now — The Math
Position: 500 units at $48 = $24,000 market value
IRS-adjusted basis: $8,000 | Suspended losses: $3,200
Sell now:
Gain: $24,000 − $8,000 = $16,000
§751 ordinary: ~$7,000 × 37% = $2,590
Capital gain: ~$9,000 × 15% = $1,350
Suspended loss offset: −$1,184
Net tax: ~$2,756
Hold until death (step-up):
Heir's basis: $24,000 (market value)
§751 recapture: $0
Capital gains tax: $0
Suspended losses: expire ($3,200 lost)
Net tax: $0
The step-up saves $2,756 in taxes. The lost suspended losses ($3,200) would have been worth ~$1,184 in tax savings at 37%. Net benefit of holding: ~$1,572 on this position alone. For larger positions, the savings scale dramatically.
When the step-up argument weakens: If your estate planning horizon is 20+ years and you have a significantly better investment opportunity available, the opportunity cost of holding may exceed the step-up benefit. Age, health, and portfolio size all factor into this decision.
Factor 5: The Opportunity Cost of Holding
The step-up at death is compelling — but it's not free. The cost is what you could have earned by selling, paying the taxes, and reinvesting the after-tax proceeds elsewhere.
Opportunity Cost Framework
If the alternative investment returns 8% annually:
- After 5 years: $21,244 grows to ~$31,213
- After 10 years: $21,244 grows to ~$45,867
Compare to keeping the MLP position:
- MLP yield + appreciation: ~6–8% total return
- But distributions continue eroding basis, increasing future tax
- Step-up at death eliminates the tax — but when?
The honest answer: If the MLP is yielding 7% with strong coverage and you expect total returns comparable to your alternative investment, the step-up at death almost always wins. If the MLP has deteriorating fundamentals (per the evaluation framework) and you have a significantly better opportunity, the tax cost of selling may be justified.
Factor 6: Which Lots to Sell (FIFO vs. Specific ID)
If you've bought MLP units over multiple years — or accumulated lots through DRIPs — you have multiple tax lots with different bases, holding periods, and §751 exposures. Which lots you sell first significantly affects your tax bill.
FIFO (Default)
First In, First Out. Your earliest-purchased lots are sold first. These typically have the most basis erosion (lowest basis) and highest §751 exposure. FIFO usually produces the largest tax bill because the oldest lots have the most embedded gain.
Specific Identification
You choose exactly which lots to sell. This lets you sell highest-basis lots first (smallest gain), long-term lots only (preferential rates), or strategically sell all lots to trigger suspended loss release. Requires notifying your broker at the time of sale.
Key Insight
The strategic tension: Specific identification lets you minimize gain by selling high-basis lots. But suspended passive losses are only released on complete disposition. Sometimes selling all lots — including the low-basis, high-gain ones — results in lower total tax because the released suspended losses more than offset the additional gain. Run both scenarios before deciding.
The Decision Framework: Hold, Sell Partially, or Sell Completely
Here's how to synthesize all six factors into an actual decision. Walk through this framework with your real numbers.
Decision Tree
Step 1: Check the fundamentals
Is the MLP's distribution coverage, leverage, and contract profile still strong? (Use the evaluation framework.) If fundamentals are deteriorating, the sell decision is about investment quality, not tax optimization — sell regardless of tax cost.
Step 2: Calculate your real basis
Use the K-1 Basis Tracker to find your IRS-adjusted basis. If basis erosion is less than 20%, the tax cost of selling is moderate. If erosion is 50%+, the embedded gain is substantial.
Step 3: Estimate §751 exposure
Review your cumulative K-1 depreciation deductions as a rough proxy. For a midstream MLP held 5+ years, assume 30–60% of total gain will be §751 ordinary income.
Step 4: Check suspended passive losses
Sum your suspended PTP losses from prior K-1 filings (or your tax software's passive activity carryforward schedule). Large accumulated losses make a complete sale more attractive.
Step 5: Evaluate the step-up timeline
How long is your estate planning horizon? For investors over 70 with large basis erosion, the step-up is likely the dominant strategy. For investors under 50 with decades of compounding ahead, opportunity cost may outweigh the step-up benefit.
Step 6: Run the scenarios
Calculate the after-tax proceeds from: (A) selling all lots now, (B) selling high-basis lots only, (C) holding everything. Compare the after-tax reinvestment potential of A and B against the continued yield + step-up benefit of C.
Warning
The most common mistake: Investors who decide to sell based on the unit price alone — "it's up 40%, I should take profits" — without considering that their real gain is 80%+ due to basis erosion, and that 40% of that gain will be taxed as ordinary income. Know your numbers before you place the order.
Worked Example: Same Investor, Four Strategies, Different Outcomes
Meet Sarah. She bought 800 units of EPD at $22 in 2018 ($17,600). After 8 years of distributions and K-1 adjustments, her IRS-adjusted basis is $7,200. EPD currently trades at $32. She has $4,100 in accumulated suspended passive losses.
| Strategy | Proceeds | §751 | Cap Gain | Suspended Losses Used | Net Tax |
|---|---|---|---|---|---|
| A: Sell all 800 units | $25,600 | $8,280 | $10,120 | $4,100 | $2,958 |
| B: Sell 400 units | $12,800 | $4,140 | $5,060 | $4,100* | $720 |
| C: Hold for step-up at death | — | — | — | — | $0 today |
| D: Sell all in low-income year | $25,600 | $8,280** | $10,120 | $4,100 | $2,073 |
*Partial sale: the $9,200 gain on the 400 units is income from the same PTP, so the $4,100 of suspended losses is allowed against it (Form 8582 instructions, Special Instructions for PTPs). The sale-year K-1 items would also enter this netting and are not modeled.
**Same §751 amount, taxed at the 22% ordinary rate in the low-income year instead of 37%.
§751 shown is the engine’s moderate estimate (80% of a $10,350 depreciation proxy, about 45% of the full-sale gain). The actual amount comes from the partnership’s sales schedule. Row C shows no sale-year tax; what happens to suspended losses at death is covered in the stepped-up basis guide.
Sarah’s numbers depend on her timeline. Strategy C defers the $2,958 of Strategy A for as long as she holds. Strategy D, timing the sale to a sabbatical year or a gap between jobs, saves $885 versus Strategy A because the §751 income and the loss benefit are both priced at the lower ordinary rate. Whether either is worth it depends on her facts; the engine only prices the tax.
Timing: When in the Year to Sell
Beyond the hold-vs-sell decision, when you sell within the calendar year matters.
- Low-income years: If you're between jobs, taking a sabbatical, or retiring mid-year, your marginal tax rate on ordinary income drops significantly. Since §751 income is taxed at ordinary rates, selling during a low-income year can save 10–15 percentage points on the §751 portion.
- Before vs. after year-end: Selling in December realizes the gain in the current year. Selling in January pushes it to next year. If your income is expected to be lower next year, deferring to January helps. If lower this year, sell in December.
- K-1 simplification: Selling before year-end means one final K-1 for the year of sale. Selling in January means you'll receive another partial-year K-1 the following spring — more complexity, more basis tracking, more tax prep work.
- Distribution timing: If you sell just before the ex-distribution date, you avoid the basis reduction from one more distribution. If you sell just after, you receive the cash but your basis drops further — increasing your gain by the distribution amount.
Key Takeaways
- 1.Selling MLPs is not like selling stock — basis erosion, §751 recapture, and suspended losses create a fundamentally different tax calculus
- 2.Know your real IRS-adjusted basis (not your broker's number) before making any sell decision
- 3.§751 recapture typically represents 30–60% of gain and is taxed as ordinary income — up to 37% (potentially ~29.6% after §199A; consult your tax advisor on eligibility)
- 4.Suspended losses offset the gain on any sale of that PTP’s units; only a complete, fully taxable disposition to an unrelated party lifts the passive loss limit on the PTP’s overall loss (§469(g)(1)(A))
- 5.The stepped-up basis at death eliminates all basis erosion, §751 recapture, and embedded gains — the strongest argument for holding
- 6.Timing the sale to a low-income year can reduce §751 tax by 10–15 percentage points on the ordinary income portion
- 7.Run all scenarios — sell all, sell partial, hold forever — with your actual numbers before placing the order
Know your numbers before you decide
The K-1 Basis Tracker calculates your IRS-adjusted basis, tracks year-over-year erosion, and shows exactly what's at stake if you sell. Free, no signup required.
In the K-1 tracker, typing your numbers in uploads nothing; an uploaded K-1 PDF is read by a third-party AI provider. Privacy
Open K-1 Basis TrackerFrequently Asked Questions
It depends on six factors: your current basis level, §751 recapture exposure, accumulated suspended passive losses, your estate planning timeline, the after-tax opportunity cost of holding, and which specific lots you would sell. There is no universal answer — the same investor with two different MLPs might hold one and sell the other based on these factors. The decision framework in this article walks through each factor.
The tax cost has two components: (1) Capital gains tax on the difference between sale proceeds and your IRS-adjusted basis (not your broker's basis). (2) §751 ordinary income recapture on the portion of gain attributable to partnership depreciation — taxed at your marginal rate (up to 37%). Suspended passive losses released at sale offset both components. The net tax cost depends heavily on how long you've held and how much basis erosion has occurred.
Yes. Under IRC §1014, heirs receive MLP units with a basis equal to fair market value on the date of death. This eliminates all accumulated basis erosion, all §751 recapture exposure, and all embedded capital gains. However, suspended passive losses expire unused — they cannot transfer to heirs. The step-up makes the "hold forever" strategy mathematically optimal for investors with substantial basis erosion and a long estate planning horizon.
Gain on the units sold is income from that PTP, so the PTP's losses, current-year and prior-year unallowed, are allowed against it to the extent of the PTP's income for the year, whether the sale is partial or complete (Form 8582 instructions, Special Instructions for PTPs). Disposing of your entire interest in a fully taxable transaction to an unrelated party also lifts the passive loss limit on the PTP's overall loss for the year, which is then treated as not from a passive activity (IRC §469(g)(1)(A); §469(k)(3)). A partial sale does not do that; the unused balance carries forward.
Yes. You can use specific identification to choose which tax lots to sell. This allows you to optimize by selling lots with higher basis (lower gain) or shorter holding periods (if you want to control the character of gain). The PTP's losses are allowed against the gain on the units sold to the extent of the PTP's income for the year; only a disposition of your entire interest in a fully taxable transaction to an unrelated party lifts the passive loss limit on the PTP's overall loss for the year (IRC §469(g)(1)(A); §469(k)(3)). The tension between lot optimization and loss release exists only when your suspended balance exceeds the gain you would recognize.
The default is FIFO (first in, first out), but you can elect specific identification by notifying your broker before or at the time of sale. Consider: (1) Highest-basis lots first to minimize immediate gain. (2) Long-term lots (held >1 year) for preferential capital gains rates. (3) Lots with the most favorable §751 allocation. (4) Whether selling all lots of a specific PTP to trigger suspended loss release.
Opportunity cost is the after-tax return you could earn by selling the MLP and reinvesting the proceeds elsewhere. If selling triggers $10,000 in taxes but the reinvestment earns 8% annually, the opportunity cost of holding is the compounded return you forgo — roughly $4,660 over 5 years. Compare this to the tax savings from the step-up at death. The breakeven depends on your age, health, expected holding period, and alternative investment returns.
Timing matters for two reasons: (1) K-1 simplification — selling before year-end means you get one final K-1 for the year of sale. Selling in January means another partial-year K-1. (2) Tax year control — selling in December realizes the gain in the current tax year; selling in January pushes it to next year. If your income is unusually low this year (job change, retirement, sabbatical), accelerating the sale into the low-income year can reduce the marginal tax rate on §751 ordinary income.
Disclaimer: This content is for educational and informational purposes only. It does not constitute tax, legal, or financial advice. MLP taxation involves complex rules including basis tracking, §751 recapture, passive activity limitations, and multi-state filing. Consult a qualified tax professional before making tax or investment decisions.
Lucas Andersen is not a CPA, Enrolled Agent, or tax attorney. Information reflects rules as of the date published and may change. Always verify with current IRS guidance.