Most cash you receive from a master limited partnership is not taxed the year it lands in your account. That is the short answer to how MLP distributions are taxed: because an MLP is a pass-through partnership rather than a corporation, the bulk of each quarterly payout is classified as a return of capital, which defers tax until you sell. The trade-off is a shrinking cost basis, an annual Schedule K-1 instead of a 1099-DIV, and a tax bill at sale that is often larger, and partly taxed at ordinary rates, than investors expect.
Why an MLP Distribution Isn’t a Dividend
A corporation pays dividends out of after-tax profits. An MLP doesn’t pay entity-level federal income tax at all. It passes income, deductions, and credits directly to unit holders, provided at least 90% of its gross income comes from qualifying sources, which for most publicly traded partnerships means transporting, processing, storing, or marketing oil, gas, minerals, and similar commodities.1Office of the Law Revision Counsel. 26 U.S. Code 7704 – Certain Publicly Traded Partnerships Treated as Corporations
What hits your account is labeled “available cash flow.” That cash flow usually exceeds the MLP’s reported taxable income, because pipelines, tank farms, and processing plants throw off large depreciation deductions that reduce taxable income on paper without touching the cash the business actually generates. The gap between cash flow and taxable income is the whole reason most of your distribution escapes current tax.
Return of Capital and Your Shrinking Basis
The portion of your distribution above your share of the MLP’s taxable income is treated as a return of capital. Return of capital is not income. The tax code treats it as the partnership handing back part of what you originally invested, so you owe nothing on it the year you receive it.
Instead, every dollar of return of capital reduces your adjusted cost basis. Buy units at $50, receive $5 in return of capital during the first year, and your basis drops to $45. The $5 is tax-free that year, but when you sell, gain is measured from $45, not $50. You have shifted the tax obligation, not eliminated it.
Your basis also moves for other items reported on the annual K-1: allocated income pushes it up, allocated losses and deductions pull it down. Because energy infrastructure MLPs pass through heavy depreciation, the downward adjustments dominate, and return of capital ends up making up most of the typical distribution. Every K-1 you receive changes the calculation, which is why you have to keep all of them for as long as you hold the units.
What Happens When Basis Reaches Zero
The deferral runs only as long as your basis stays positive. Once it hits zero, any further distributions classified as return of capital flip to being taxable as capital gains in the year received. On distributions after that point, the deferral advantage is gone. For investors who have held units for a decade or more, a zero basis is common.
The 20% Deduction on the Taxable Slice
Whatever portion of MLP income is currently taxable may qualify for a 20% deduction under Section 199A. Originally part of the 2017 Tax Cuts and Jobs Act and made permanent by the One Big Beautiful Bill Act, the provision lets eligible taxpayers deduct up to 20% of qualified publicly traded partnership income.2Internal Revenue Service. Qualified Business Income Deduction The PTP income component is treated separately from ordinary qualified business income and is not limited by W-2 wages or the cost of depreciable property.
In practice, if your K-1 shows $1,000 of taxable income from the MLP, you may deduct up to $200 of it, cutting the effective tax on that slice by a fifth. Starting in 2026, taxpayers with at least $1,000 in total qualified business income from active qualified trades or businesses can claim a minimum deduction of $400, with both figures indexed for inflation.
The Schedule K-1 You’ll Actually Receive
MLP unit holders receive Schedule K-1 (Form 1065) rather than the Form 1099-DIV that stockholders get.3Internal Revenue Service. Partner’s Instructions for Schedule K-1 (Form 1065) (2025) The K-1 reports your proportional share of the partnership’s income, deductions, credits, and distributions. Box 1 shows ordinary business income or loss, and supplemental statements track total cash distributions and the return-of-capital amount you need for basis tracking.
K-1s tend to arrive late. MLPs have until March 15 to issue them, and many push that deadline or send corrections afterward. If you hold even one MLP in a taxable account, plan on filing a tax extension. The forms feed into Schedule E, Form 8949, and often multiple state returns, and most MLP investors end up paying for professional preparation. That preparation cost is a real annual expense worth pricing into your expected return.
Losses Are Trapped Per MLP
Income and losses from an MLP are passive. Federal law also requires the passive activity rules to be applied separately to each publicly traded partnership you own.4Office of the Law Revision Counsel. 26 U.S. Code 469 – Passive Activity Losses and Credits Limited A loss from one MLP cannot offset income from another MLP, and no MLP loss can offset wages, interest, or portfolio gains. Every MLP sits in its own bucket.
When your K-1 shows a net loss, it is suspended. It carries forward indefinitely and can only be used against future passive income from the same MLP, until you sell your entire interest in that MLP in a fully taxable transaction to an unrelated buyer.5Internal Revenue Service. Instructions for Form 8582 (2025) At that point all suspended losses are released and can offset the gain on sale or even produce a net loss.
State Returns You May Not Have Expected
Owning an MLP can create filing obligations in every state where the partnership operates. If pipelines run through eight income-taxing states, you may owe a nonresident return in each one. K-1 supplemental schedules typically include a state-by-state income breakdown so you can see where the partnership earned money.
Many state allocations are small enough to fall below the filing threshold, but a number of states set that threshold at effectively zero, meaning any allocated income triggers a return. Even where the tax due is minimal, filing the return may still be required to show it. Some MLPs operate in only one or two states, which limits the problem, so checking the geographic footprint before you invest is worth the few minutes.
The 3.8% Net Investment Income Tax
MLP investors with modified adjusted gross income above $200,000 (single) or $250,000 (married filing jointly) may owe an additional 3.8% net investment income tax on MLP income. Because most unit holders are passive owners, their allocated share of the partnership’s earnings counts as net investment income subject to the surtax, as does gain on sale to the extent they held passively.6Internal Revenue Service. Questions and Answers on the Net Investment Income Tax
Return of capital doesn’t count, since it isn’t income. But allocated taxable earnings and any capital gain at sale are both in play. An investor in the top bracket can face a combined 40.8% rate on ordinary income recapture at sale rather than the 37% figure typically quoted.
Why MLPs and IRAs Don’t Mix Well
An IRA, Roth IRA, or other tax-exempt account does not shield you from all MLP-related tax. When a tax-exempt entity earns income from an active trade or business, that income is unrelated business taxable income, reported on the K-1 at Box 20, Code V.3Internal Revenue Service. Partner’s Instructions for Schedule K-1 (Form 1065) (2025) If total UBTI across all investments in a single retirement account reaches $1,000 or more of gross income, the custodian must file Form 990-T and pay the resulting tax out of account assets.7Internal Revenue Service. Instructions for Form 990-T (2025)
Each retirement account is treated as a separate entity for this purpose and needs its own EIN if a filing is required.8Internal Revenue Service. Unrelated Business Income Tax Some custodians handle the filing automatically; others expect the account holder to catch it. The deeper problem is that the tax-deferral advantage is already built into the MLP structure, so wrapping it in another tax-deferred vehicle adds no benefit while potentially triggering a tax the account was meant to avoid.
What You Owe When You Sell
Selling MLP units is where the deferral comes due, and the bill is often larger than investors expect. Gain or loss starts with your final adjusted basis, which reflects every return-of-capital distribution and every allocated income, loss, and depreciation item from every year you held. After years of downward adjustments, even a flat unit price can produce a substantial taxable gain.
Ordinary Income Recapture
Not all of that gain gets favorable capital gains rates. The portion attributable to “hot assets” inside the partnership is recharacterized as ordinary income.9Office of the Law Revision Counsel. 26 USC 751 – Unrealized Receivables and Inventory Items For energy MLPs, the hot assets that matter are Section 1245 property (pipelines, compressors, processing equipment) and Section 1250 property (buildings and structural improvements), to the extent cumulative depreciation deductions pulled their basis below sale value.
Section 1245 depreciation recapture is taxed at your ordinary rate, which can reach 37% for 2026.10Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026 Section 1250 recapture is capped at 25% as unrecaptured Section 1250 gain.11eCFR. 26 CFR 1.453-12 – Allocation of Unrecaptured Section 1250 Gain The MLP provides a supplemental schedule with your final K-1 that splits ordinary recapture from capital gain, so you don’t have to derive it from scratch. You do have to be ready for how large the recapture number can be.
Capital Gain and a Counterintuitive Result
Whatever survives after ordinary recapture and unrecaptured Section 1250 gain is treated as long-term capital gain if you held the units more than a year.12Office of the Law Revision Counsel. 26 USC 1222 – Other Terms Relating to Capital Gains and Losses The arithmetic can be strange. Selling at the same price you paid can still produce a large ordinary-income tax bill, because the reduced basis creates a gain that is almost entirely recapture. In some cases you can even show a capital loss on the sale while owing ordinary tax on recaptured depreciation. The deferral you enjoyed year by year is effectively repaid at exit, often at a higher rate than you would have paid along the way.
Reporting the Sale
You report the sale on Form 8949 and Schedule D, using the final K-1 and its supplemental schedules.13Internal Revenue Service. Instructions for Form 8949 (2025) Your brokerage Form 1099-B will show only the original purchase price, not your adjusted basis or the recapture split, so the 1099-B alone will not give you the right answer. The final K-1 may not arrive until well into tax season, which makes an extension close to unavoidable in the year of sale.
On a complete disposition to an unrelated buyer in a fully taxable transaction, any suspended passive losses from that MLP are released and can offset the gain.5Internal Revenue Service. Instructions for Form 8582 (2025) Careful recordkeeping over the years pays back here directly, dollar for dollar.
The Estate Planning Exit
If units pass to an heir at death, the heir receives a stepped-up basis equal to fair market value on the date of death.14Office of the Law Revision Counsel. 26 U.S. Code 1014 – Basis of Property Acquired from a Decedent Years of accumulated basis reductions from return-of-capital distributions are erased. The depreciation recapture that would have been taxed as ordinary income on a lifetime sale effectively disappears. For long-term holders whose basis is near zero, this is the single largest tax benefit available on MLP units and the main reason some advisors suggest holding through death rather than selling late in life.