How MLP Dividends Are Taxed: K-1s, Basis, and Section 199A

Cash from a Master Limited Partnership mostly isn’t taxed the year you receive it. How MLP distributions are taxed is a two-stage story: while you hold the units, most of each payment is treated as a return of your own invested capital, which lowers your cost basis instead of triggering current tax. When you eventually sell, the tax that was deferred all those years comes due, split between capital gain and ordinary income. The deferral is the appeal. The recordkeeping and the bill at the end are the tradeoff.

Why MLP Distributions Aren’t Dividends

An MLP is a pass-through entity: it pays no corporate tax, and every dollar of income, deduction, gain, and loss flows through to unitholders. A publicly traded partnership only qualifies as an MLP if at least 90 percent of its gross income comes from qualifying sources, which in practice means natural resource activities like transporting, storing, and processing oil and natural gas.¹

The quarterly check looks like a dividend. It isn’t one. The IRS does not treat MLP distributions as qualified dividends, and they aren’t taxed under the dividend rules. A typical payout is a blend of three things: ordinary income from operations, capital gains from asset sales, and a return of capital. Return of capital usually dominates, often making up the vast majority.

Return of capital is not current taxable income. Instead of owing tax the quarter you receive it, the distribution reduces your cost basis. As long as your basis stays above zero, the cash is tax-free in the year you receive it.

When Basis Hits Zero

Once your cumulative return-of-capital distributions exceed what you paid for the units, your basis is zero. From that point forward, every additional dollar classified as return of capital is immediately taxable as a capital gain.² Long-time holders sometimes cross this line without noticing, because nobody sends a warning.

Phantom Income

Deferral runs in one direction. If the MLP has a profitable year but cuts or suspends cash distributions, your K-1 will still report your share of the taxable income. You owe tax on it even though no cash arrived. This shows up most often when the partnership is reinvesting heavily or paying down debt, and in smaller amounts anytime the ordinary-income portion of your K-1 exceeds what the MLP paid you.

The Schedule K-1 and Tracking Your Basis

You will not receive a 1099-DIV. Every MLP investor gets a Schedule K-1 (Form 1065) reporting your share of income, deductions, credits, and distributions for the year.³ Two boxes drive the routine tax work:

Box 1, ordinary business income or loss: your share of the MLP’s operating profit or loss, taxed at your regular rate.
Box 19, distributions: the total cash the MLP paid you during the year. This is not the same as your taxable income; most of it is return of capital.

You do not attach the K-1 to your Form 1040. The instructions tell you to keep it for your records and not file it with your return unless a narrow exception applies.³ You do need to report its figures accurately on the right schedules. The partnership files its own copy directly with the IRS.

K-1s show up late. They commonly arrive in late March or even mid-April, well after brokerage 1099s. If yours isn’t in hand when the deadline nears, Form 4868 gives you an automatic six-month filing extension, though any tax owed is still due by the original April date.⁴

Basis Is Your Job

Neither the MLP nor your broker maintains an official running basis for you. Get this wrong and your gain or loss at sale will be wrong, potentially by thousands of dollars.

Initial basis is whatever you paid for the units, including commissions. Each year it adjusts:

Up by your share of the partnership’s taxable income (Box 1 ordinary income, capital gains, other K-1 income items) and any additional capital you contribute.
Down by cash distributions received, your share of losses and deductions, and any non-deductible expenses passed through.

Because distributions are largely return of capital, decreases typically outpace increases. Over a long hold, basis erodes toward zero. Keep a year-by-year ledger with your original cost, each K-1’s allocations, and every distribution. Reconstructing a decade of K-1s later is painful and sometimes impossible.

Passive Losses From an MLP Stay With That MLP

MLP income and losses are passive for almost every unitholder, since you don’t materially participate in pipeline operations. Federal law imposes a stricter rule for publicly traded partnerships than for other passive activities: a loss from a particular MLP can only offset income from that same MLP.⁵ You cannot use a loss from MLP A to reduce income from MLP B, from a rental, or from your salary.

When a K-1 shows a net loss beyond your income from that same MLP, the unused portion becomes a suspended loss and carries forward indefinitely, waiting for future income from that same partnership. Investors routinely stack years of suspended losses this way.

The payoff arrives when you sell your entire interest. All accumulated suspended losses from that MLP become fully deductible and can offset any type of income, including wages, investment income, and gains from other MLPs.⁶ This release is one of the most valuable, and most overlooked, features of MLP investing, because it directly cuts the tax on the sale itself.

The 20 Percent Section 199A Deduction

From 2018 through 2025, MLP investors could claim a deduction equal to 20 percent of their qualified publicly traded partnership income under Section 199A. Applied to the ordinary income on the K-1, it effectively dropped the top federal rate on that portion from 37 percent to roughly 29.6 percent.⁷

As of the most recent IRS guidance, the deduction was available only for tax years ending on or before December 31, 2025. Congress considered extending it as part of broader 2025 tax legislation. Before filing a 2026 return, confirm whether an extension was enacted. If it wasn’t, ordinary income from your K-1 will be taxed at your full marginal rate with no 20 percent offset.

What Happens When You Sell

Selling MLP units is a two-part tax event, and the second part is where the surprise usually lives.

Capital Gain or Loss

Compare sale proceeds to your final adjusted basis. Held more than a year, the difference is a long-term capital gain or loss reported on Form 8949 and Schedule D.⁸ For 2026, long-term gains are taxed at 0, 15, or 20 percent depending on your taxable income.⁹

Because years of return-of-capital distributions have driven your basis down, the taxable gain is almost always much larger than the spread between purchase price and sale price. Buy at $30, sell at $35, and it looks like a $5 gain per unit. But if distributions have pulled the basis to $10, the actual gain is $25 per unit. This is where the deferred tax lands.

Section 751 Ordinary Income Recapture

Over your holding period, the MLP passed through depreciation and depletion deductions that reduced your taxable income. On sale, the IRS recharacterizes the portion of your gain attributable to those prior deductions as ordinary income rather than capital gain.¹⁰ This recapture is taxed at your regular marginal rate, up to 37 percent, and reported on Form 4797.¹¹

If your modified adjusted gross income exceeds the Net Investment Income Tax thresholds ($200,000 single, $250,000 married filing jointly), an additional 3.8 percent surtax can apply to the gain.¹²

The MLP provides a sales schedule with your final K-1 that breaks the recapture out from the capital gain portion. Any accumulated suspended passive losses from that MLP become deductible in the year of sale and can offset both the recapture income and the capital gain.⁶

What Happens If You Hold Until Death

Units passed to heirs receive a stepped-up basis to the fair market value at the date of death.¹³ All the basis erosion from years of return-of-capital distributions is wiped clean. Held with a basis of $3 per unit and worth $40 at death, the heir’s new basis is $40. Both the deferred tax and the Section 751 recapture that would have hit on a lifetime sale effectively disappear.

That combination — tax-deferred cash flow while you own the units, full basis reset for heirs — is one of the strongest estate-planning features in the code. If you are considering selling units with a large embedded gain, weigh the sale tax against what a stepped-up basis would do for your beneficiaries.

MLPs in an IRA Create a Different Tax Problem

Putting an MLP inside an IRA or 401(k) looks like a way to sidestep the K-1 headache entirely. It isn’t. Because an MLP is an operating business, the income allocated to a tax-exempt account is Unrelated Business Taxable Income. If UBTI in the account reaches $1,000 or more in a year, the account itself owes tax and the custodian must file Form 990-T.¹⁴

The $1,000 figure is a specific deduction built into the statute, not an inflation-adjusted threshold. Anything above it is taxed at trust rates, and the tax is paid out of the IRA’s own assets. That directly shrinks the retirement account and defeats the point of using a sheltered account for the investment. Most custodians will handle the 990-T filing, but the cost still comes out of your savings. Check your K-1 each year; if Box 1 shows significant ordinary income, the UBTI risk is real.

1
Office of the Law Revision Counsel. 26 U.S. Code 7704 – Certain Publicly Traded Partnerships Treated as Corporations
2
Office of the Law Revision Counsel. 26 USC 731 – Extent of Recognition of Gain or Loss on Distribution
3
Internal Revenue Service. Partners Instructions for Schedule K-1 Form 1065 2025
4
Internal Revenue Service. Form 4868 – Application for Automatic Extension of Time to File U.S. Individual Income Tax Return
5
Office of the Law Revision Counsel. 26 U.S. Code 469 – Passive Activity Losses and Credits Limited – Section (k)
6
Office of the Law Revision Counsel. 26 U.S. Code 469 – Passive Activity Losses and Credits Limited – Section (g)
7
Internal Revenue Service. Qualified Business Income Deduction
8
Internal Revenue Service. 2025 Instructions for Form 8949 – Sales and Other Dispositions of Capital Assets
9
Internal Revenue Service. Topic No. 409, Capital Gains and Losses
10
Office of the Law Revision Counsel. 26 USC 751 – Unrealized Receivables and Inventory Items
11
Internal Revenue Service. 2025 Instructions for Form 4797 – Sales of Business Property
12
Internal Revenue Service. Topic No. 559, Net Investment Income Tax
13
Office of the Law Revision Counsel. 26 U.S. Code 1014 – Basis of Property Acquired From a Decedent
14
Office of the Law Revision Counsel. 26 U.S. Code 512 – Unrelated Business Taxable Income