Selling MLP units isn't like selling stock. The tax consequences are dramatically different — and the wrong timing can cost thousands. Here's the decision framework that integrates basis, §751, suspended losses, and estate planning.
By Lucas Andersen — Last updated April 9, 2026
Your IRS-adjusted basis is not what you paid. Each year, K-1 distributions (Box 19A) reduce your outside basis, while Box 1 income or loss, Section 743(b) adjustments, and liability changes further modify it. After 8 years of holding EPD, a unitholder who paid $26/unit may have an IRS-adjusted basis of $16–$18/unit. Your basis tracker or CPA’s Partner’s Basis Worksheet shows the real number. Your broker’s 1099-B does not — see why your broker’s cost basis is wrong. The lower your IRS basis relative to the current unit price, the larger your taxable gain at sale. This is the foundation of every sell decision. Read more on distribution basis erosion.
IRC §751 recharacterizes a portion of your gain as ordinary income, taxed at your marginal rate (up to 37%) rather than the 15–20% capital gains rate. The §751 amount represents your share of the partnership’s “hot assets” — primarily accumulated depreciation recapture. For midstream MLPs, §751 ordinary income typically represents 30–60% of total gain, depending on the partnership’s asset depreciation profile. The exact amount appears on the Sales Schedule included with your final-year K-1. See the full explanation at §751 depreciation recapture.
Under IRC §469(k), PTP losses can only offset income from that same PTP. If your MLP has generated net losses for years, those losses accumulate as suspended passive losses. Under §469(g), a complete disposition of your entire interest in a PTP releases all suspended losses. The released losses first offset §751 ordinary income (saving you up to 37%), then offset capital gains (saving 15–20%), and any remaining excess becomes a deductible loss against ordinary income. This makes suspended losses extremely valuable at sale — sometimes turning a tax bill into a tax benefit. See PTP passive loss rules for the full mechanics.
IRC §1014 provides heirs a stepped-up basis equal to fair market value at the date of death. For MLP holders, this eliminates all accumulated basis erosion, all §751 recapture exposure, and all embedded capital gains — in a single event. Suspended passive losses expire unused at death (§469(g)(2)), but the step-up typically dwarfs the lost losses. For a unitholder whose basis has eroded from $26 to $8 per unit, the step-up at a $30 market price eliminates $22/unit of taxable gain and all associated §751 recapture. This is the foundation of the “hold forever” strategy. Read more at MLP estate planning.
Holding an MLP to avoid tax is rational only if the after-tax return exceeds what the proceeds would earn elsewhere. Compare the MLP’s after-tax yield (distributions minus your marginal tax on K-1 income) against what you’d earn deploying the after-tax sale proceeds into an alternative investment. If EPD yields 7% pre-tax and your marginal rate is 32%, the after-tax yield is roughly 4.8%. If selling triggers a 22% effective tax rate on the gain and the proceeds would earn 8% in an index fund, the math may favor selling despite the tax cost. Run the numbers with actual basis, not assumptions.
If you purchased units at different times, each lot has a different basis. Selling your highest-basis lots first minimizes immediate taxable gain. Under specific identification rules, you must identify the lots being sold before the trade settles. If you don’t specify, the IRS default is FIFO (first in, first out), which typically means selling the oldest lots with the most basis erosion — the worst outcome. Contact your broker before selling to confirm they support specific lot identification for partnership units.
500 units of EPD. Original purchase price: $26.00/unit ($13,000 total cost). Current IRS-adjusted basis after 8 years: $16.40/unit ($8,200 total). Current market price: $30.00/unit.
| Line Item | Amount |
|---|---|
| Sale proceeds (500 × $30) | $15,000 |
| IRS-adjusted basis | $8,200 |
| Total gain | $6,800 |
| §751 ordinary income (est. 45%) | $3,060 |
| Capital gain (remainder) | $3,740 |
| Suspended passive losses | ($2,100) |
| Net §751 after loss offset ($3,060 − $2,100) | $960 |
| Tax on §751 at 32% marginal rate | $307 |
| Tax on capital gain at 15% | $561 |
| Total federal tax on sale | $868 |
| Tax if held until death (§1014 step-up) | $0 |
In this example, selling costs $868 in federal tax. Holding until death costs $0 — the step-up eliminates the entire $6,800 gain. The $868 tax cost is the price of redeploying $15,000 into an alternative investment. Whether that price is worth paying depends on the expected after-tax return differential over your remaining holding period.
Selling 200 of 500 units does not release suspended passive losses. IRC §469(g) requires a complete disposition of your entire interest in the PTP. A partial sale locks your suspended losses in place while still triggering §751 recapture on the sold units — the worst combination. If suspended losses are a meaningful part of your sell calculation, either sell your entire position or understand that partial sales cannot access them. This single rule changes the math for many investors considering a trim rather than a full exit.
Use the K-1 Basis Tracker to calculate your IRS-adjusted basis for each position. Then apply the six-factor framework above with your actual numbers. The difference between selling at the right time and selling without analysis can be thousands of dollars in avoidable tax — or the permanent elimination of tax through the estate step-up.